The correct answer for the isolated systems is options 2 & 4.
2) A ball is dropped from the top of a building. The system is the ball and the earth.
4) A car slides to a halt in an emergency. The system is the car.
In both of these systems, the isolated system is the object in motion, either the ball dropped from the top of the building or the car sliding to a halt in an emergency. The conservation of linear momentum is applicable because the system does not interact with any external forces or objects.
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a lightweight rope is wrapped around a 100 lb drum, passes over a frictionless pulley, and is attached to a weight w (see below). the coefficient of friction between the drum and the surfaces is 0.50. determine the maximum amount of weight that can be supported by this arrangement.
The forces that are present when there is physical contact are referred to as the contact force and the forces that are present when there is no physical contact as the field force or non-contact force.
On the hanging weight since it is the constant speed we can assume that object is in equilibrium and
Tension = m*g
Where m = mass and g = acceleration due to gravity
On the drum since it is also moving with constant angular speed net torque on it will be zero.
τ - TR =0
Where τ = torque, T= tension and R= Radius of drum = 0.5 m
Replacing the expression for Tension of the rope in above equation:
τ(torque) = mgR
Solving for m using R = 0.5m, g = 10 m/ s2 and τ = 358 N.m
m = = 179 kg
Therefore the mass is -179 kg of the torque produced by the rope.
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A planet travels in an elliptical orbit around its star, as shown above. Which arrow best shows the direction of the net force exerted on the planet?
The arrow that best shows the direction of the net force exerted on the planet is arrow B.
What is the net force exerted on a planet orbiting the sun?
The net force exerted on an object travelling round the sun is known as gravitational force.
According Newton's law of universal gravitation, every two objects in the universe attract each other with a force that is directly proportional to the product of masses of the objects and inversely proportional to the square of the distance between them.
Fg = Gm₁m₂/R²
where;
m₁ is the mass of the first object (planet)m₂ is the mass of the second object (planet)R is the distance between the two objectsThus, gravity is the primary force that controls the orbit of the planets around the sun and it is directed towards the sun.
Each planet has its own gravity based on the size of the planet and the speed at which it travels round the sun.
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According to the video, which of the following is not a tool that scientists use to monitor air pollution?
thermometer
The following is not tool that scientists use to monitor air pollution is the thermometer.
Air quality is measured using the Air Quality Index or AQI. AQI works like a thermometer with a range of 0-500 degrees. However, AQI is a way of showing changes in the amount of air pollution, not changes in temperature. Avoid using petrol-powered lawns and gardening supplies.
Motor vehicle emissions of fuel oil and natural gas used to heat homes by-products of manufacturing and power generation especially coal-fired power plants and smoke from chemical production are major sources of man-made air pollution. This is the main cause. Reduce the number of trips by car. Reduce or eliminate the use of fireplaces and wood stoves. Do not burn leaves garbage or other objects.
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an experiment is conducted in which red light is diffracted through a single slit. part a listed below are alterations made, one at a time, to the original experiment, and the experiment is repeated. after each alteration, the experiment is returned to its original configuration. which of these alterations decreases the angles at which the diffraction minima appear? select all that apply. view available hint(s)for part a listed below are alterations made, one at a time, to the original experiment, and the experiment is repeated. after each alteration, the experiment is returned to its original configuration. which of these alterations decreases the angles at which the diffraction minima appear? select all that apply. the experiment is conducted in a water-filled tank. the distance between the slits and the screen is halved. a green, rather than red, light source is used. the slit width is doubled. the slit width is halved. the distance between the slits and the screen is doubled.
The answer is: The slit width is halved.
Minima are the points of low intensity in a diffraction pattern. They appear due to destructive interference between light waves scattered by different points of a lattice or crystal. Minima occur when the path difference between two waves is equal to an integer multiple of the wavelength of the light.
When the slit width is halved, the angles at which the diffraction minima appear are decreased because the diffraction pattern becomes more focused due to the reduced aperture size. This causes the minima to be closer together and have smaller angles. The other alterations do not affect the angles at which the minima appear.
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Cardiopulmonary resuscitation is a procedure used to deliver oxygenated blood to the brain when the heart is no longer beating.
Responses
False
False
True
Answer: True
Explanation:
Cardiopulmonary resuscitation (CPR) is a medical procedure involving repeated compression of a patient's chest in an attempt to restore the blood circulation and breathing of a person who has suffered cardiac arrest.
At an orange juice plant, orange juice pulp with a density of 1.25 g/ml passes through a pumping station where it is raised vertically by 5.76 m at the rate of 1,920,000 liters per day. The liquid enters and leaves the pumping station at the same speed and through pipes of equal diameter. (a) Determine the output mechanical power (in W) of the lift station. Ignore any energy loss due to friction. (b) Assume an electric motor continuously operating with average power 3.70 kW runs the pump. Find its efficiency.
The output mechanical power (in W) of the lift station is and efficiency of electric motor continuously operating with average power 3.70 kW runs the pump is 135475.2x10^3J. and efficiency is 0.065%
Given density of orange juice (ρ) = 1.25g/ml
Height of juice level (h) = 5.76m
rate of juice increases (r) = 1920000 lts/day
Through equal-diameter pipes, the liquid travels through the pumping station at the same speed as it does when leaving.
Average power = 3.70 kW = 3.7x10^3W
Time = 24h
Work done (W1) = Power x time taken = 3.70x10^3 x 24 = 88.8x10^3J
This is the difference in potential energies: the effort required to move water to a height. W2 = E1-E0 where E0 =0and E1 = mgh
m = density x volume = 1.25x10^3x1920m^3 = 2400x10^3kg
E1 = 2400x10^3x9.8x5.76 = 135475.2x10^3J
Work done (W2) = 135475.2x10^3J
efficiency = W1/W2 = 88.8x10^3/135475.2x10^3 = 0.00065 = 0.065%
Hence efficiency = 0.065%
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using energy considerations, calculate the average force (in n) a 60.0 kg sprinter exerts backward on the track to accelerate from 2.00 to 5.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 n against him. (enter a number.)
The average force is 55.62 Newtons
If acceleration from 2 meters per second to 5 meters per second is necessary within 25 meters against an average force of 30 Newtons, the sprinter must exert the force of approximately 55.62 Newtons.
Force:
A force is an influence that can alter an object's motion according to physics. A force can cause an object with mass to accelerate when it changes its velocity, such as when it moves away from rest. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction. It is calculated using the newton SI unit (N). Force is denoted by the letter F.Since forces are perceived as pushes or pulls, this can offer a simple explanation of how forces are described.
Complete question:
Using energy considerations, calculate the average force (in N) a 61.0 kg sprinter exerts backward on the track to accelerate from 2.00 to 5.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him. (Enter a number.)
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the theory that explains why and how continents move is called; the first motion of an earthquake begins at the; tectonic plates are blocks of; the first motion of an earthquake begins at the ______________________; a terrane becomes part of a continent in a process called; why so many earthquakes right now; the most conclusive proof for continental drift was provided by; convection, ridge push, and slab pull work together to produce what?
The theory that explains about the movement of continents is called continental drift. It states that the earth's continents have moved over time, relative to each other.
Earthquake is one of the major natural disasters. It causes a huge loss of life and property around the world. It occurs due to the shaking of the surface of the earth due to the sudden release of energy in the earth's crust. The first motion of an earthquake begins at the focus. It is the place inside the earth's crust where the earthquake originates.
A terrane becomes a part of a continent in a process called accretion.
Alfred Wegener produced evidence in 1912 that continents are in motion but as he could not explain what forces could move them geologists rejected his ideas. Almost 50 years later, Harry Hess confirmed Wegener's ideas by using the evidence of seafloor spreading to explain his statements.
Convection, ridge push and slab pull work together to produce constant plate tectonic motion.
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Listed following are several astronomical objects. Rank these objects based on their diameter, from largest to smallest. (Note that the neutron star and black hole in this example have the same mass to make your comparison easier, but we generally expect black holes to have greater masses than neutron stars.)
Largest Diameter
- main-sequence star of spectral type A
- Jupiter
- one-solar-mass white dwarf
- the moon
- a two-solar-mass neutron star
- the event horizon of a two-solar-mass black hole
Smallest Diameter
Feedback: Correct
The main-sequence star is obviously much larger than a planet such as Jupiter. A one-solar-mass white dwarf is about the size of Earth, which makes it larger than the Moon. A neutron star will be larger than a black hole of the same mass, because while light can escape from a neutron star, the same mass in a black hole must be more concentrated so that its gravity is strong enough to prevent light from escaping.
Objects based on their diameter, from largest to smallest are:
-main-sequence star of a spectral type A
-Jupiter
-a one-solar-mass white dwarf
-the Moon
-a two-solar-mass neutron star
-the event horizon of a two-solar-mass black hole
Earlier than then, observers had seen best 5 planets-Mercury, Venus, Mars, Jupiter, and Saturn. The sun is a celeb and is the most important object in the sun gadget. Its diameter is ready 1.4 million km. The sun is made normally of hydrogen gasoline.
From largest to smallest they're Universe, galaxy, sun machine, celebrity, planet, moon, and asteroid.
Astronomers at the NANOGrav Physics Frontiers middle have found the biggest neutron star ever recorded, which is nearly too huge to be in life. The pulsar, J0740+6620, is 2.17 times the mass of the sun and has a diameter of about 15 miles.
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in the two-string problem, tying the pliers to one of the strings best represents a(n)___state.
In the two-string problem, tying the pliers to one of the strings best represents an intermediate state.
Describe the two-string problem?
In the two string problem, the subjects are shown two strings hanging from the ceiling and are instructed to tie the strings together.
The strings are placed apart so that the subjects are unable to grasp both strings simultaneously.
In order to get the solution of the two-string problem, it involves the use of items which are available in the vicinity of the strings.
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you are working for seti, the search for extraterrestrial intelligence. one day, you receive a radio communication from an alien intelligence. although you cannot understand their language, they have included some photos from an i love lucy episode. the photos allow you to determine that it is the episode in which lucy makes a television commercial on vitameatavegamin. this episode first aired on cbs on may 5, 1952. before running to your supervisor to tell him the news, you quickly determine how far away in light-years the alien civilization is. (enter the maximum possible distance.)
The maximum possible distance in light-years of the alien civilization that sent the radio communication containing photos from the "I Love Lucy" episode "Vitameatavegamin" is approximately 22.1 light-years.
To determine the maximum possible distance in light-years of an alien civilization that has sent you a radio communication containing photos from the "I Love Lucy" episode "Vitameatavegamin," you can use the fact that light travels at a constant speed of approximately 299,792,458 meters per second.
Since the episode "Vitameatavegamin" first aired on May 5, 1952, the maximum possible distance in light-years of the alien civilization would be the distance that light could have traveled in the time since the episode aired.
To calculate this distance, you can use the following formula:
d = c × t
Where d is the distance in meters, c is the speed of light in meters per second, and t is the time in seconds.
To convert the distance from meters to light-years, you can use the conversion factor 1 light-year = 9.46 x 10^15 meters.
Plugging in the values for the speed of light and the time since the episode aired (70 years), we get:
d = 299,792,458 m/s × (70 years × 365 days/year × 24 hours/day × 3600 seconds/hour)
= 2.09 x [tex]10^{17}[/tex] meters
Converting this distance to light-years using the conversion factor above, we get:
d = 2.09 x [tex]10^{17}[/tex] meters / (9.46 x [tex]10^{15}[/tex] meters/light-year)
= 22.1 light-years
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_________ is The process of obtaining a spectrum and reading the information it contains
Spectroscopy is the process of obtaining a spectrum and reading the information it contains.
What is spectroscopy?
Spectroscopy is the study of how light and other radiation are absorbed and emitted by materials, and how this depends on the wavelength of the radiation. The study of interactions between particles like electrons, protons, and ions as well as their interactions with other particles as a function of their collision energy has been added to the term more recently. The most fundamental physics theories, such as quantum mechanics, the special and general theories of relativity, and quantum electrodynamics, have all benefited greatly by spectroscopic analysis. Scientific comprehension of the electromagnetic force as well as the strong and weak nuclear forces has been greatly aided by the use of spectroscopy in high-energy collisions.
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the op-amp circuit that has a capacitor as the feedback component and resistor at the inverting input is called a(n) . unity follower differentiator integrator summing amplifier
An integrator is an operational amplifier (op-amp) circuit with a resistor at the input terminal and a capacitor serving as the feedback component.
What purpose does a capacitor serve?A capacitor is an insensitive electric component that contains an electrostatic signal of energy. Two components that are arranged close to and are electrically insulated from one another make up a capacitor, a device used to store electrical energy. A linear capacitor is a simple example of one such flash drive.
What rules the basic operation of a capacitor?A capacitor works under the assumption that its permeability increases as a single conductor is brought close to another conductor. The upshot is that the structure has two major plates that are offset against one another and pointed in different directions.
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The magnetic field inside a 4.0cm diameter superconducting solenoid varies sinusoidally between 8.0T and 12.0T at a freqency of 10Hz.
a) what is the maximum electric field strength at a point 1.5cm from the solenoid axis?
b) What is the value of B at the instant E reaches its maximum value
E max = 0.942 V/m is the maximum electrical field amplitude at a position 1.5 cm away from the solenoid axis.
An electric field is what?The physical force that surrounds ionised objects and exerts force on every other energetic particles with in field, either attracting of repel them, is known as an electric field (or E-field). It can also refer to a collection containing charge particles' physical field.
Briefing
Diameter, D, equals 4 cm = 400 parts per million m
R = d/2 ≈ 0.04/2 = 0.02 metres for the circumference.
The electric potential is provided by Faraday's law;
Frequency; f = 10 Hz
From Faraday’s law, the electric field is given by;
E = -(r/2)(dB/dt)
We can formulate the magnetic field's equation as follows based on the magnetic field's variation:
B(t) = B_c + B_o*sin (2πft)
B(t) = 2sin(2*10t) + 10
Thus;
dB/dt = 40π cos 20πt
When cos 20t = -1, the electric field is at its maximum value.
(dB/dt)_max = -40π
Thus, with respect to the solenoid axis, at r = 1.5 centimeter = 0.015 m, we obtain;
E = -(0.015/2) × -40π
E = 0.942 V/m
The index of refraction of a glass plate is 1.60. What is the Brewster's angle when the plate isin the following substances?(a) air1°(b) water2
The Brewster's angle when the plate is in the air is 58° and 50° when in water for the given refractive index of the glass plate.
What is Brewster's angle?
In most cases, at least a portion of the optical power of the light is reflected when it strikes a flat boundary between two different transparent materials. However, given a specific incidence angle known as Brewster's angle.
What is Refractive Index?The refractive index of an optical material is a dimensionless quantity that indicates how well that material bends light. The refractive index controls how much light is refracted or curved when it enters a medium.
Calculations:
Brewster angle
θB = tan-1 (n2 /n1)
For air
θB= tan-1 (1.60 /1)
= 58°
For water
θB = tan-1 (1.60 / 1.33) =50.2°
Hence, Brewster's angle when the plate is in the air is 58° and 50° when in water for the given refractive index of the glass plate.
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when zero external work is being done on a system, which of the following statements are necessarily true about that system?
Since there was no work done, there was also no applied force. Given that Force = Mass × Acceleration and that the mass is still not zero, the acceleration must be zero.
Describe a force:Any action that modifies or sustains an object's motion is referred to as a force. 2) Describe how Newton's laws of motion relate to force. Newton's laws of motion are frequently used to explain the concept of force.
How does the magnitude of the force relate to the object's weight?The weight of a item determines the size of the force. When dragged or pushed by hand, flexible materials can alter their form. When opposed to pulling, pulling a empty sledge took less force.
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which of the following is the most important reason to astromomers for studying asteroids, comets, and dwarf planets?
The most important reason astronomers for studying asteroids is to trace solar system evolution.
what are asteroids?Small, stony objects called asteroids orbit the Sun. Despite orbiting the Sun similarly to planets, asteroids are far smaller than planets. Small, stony objects called asteroids orbit the sun. Despite orbiting the sun similarly to planets, asteroids are far smaller than planets.
What are comets called?Depending on whether a comet has more ice or rocky debris, scientists may refer to them as dirty cannonballs or snow dirtballs, according to NASA. Amazing images of Comet NEOWISE taken from space and the Earth are related.
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An athlete at the gym holds a 2.5kg steel ball in his hand. His arm is 70 cm long and has a mass of 4.0 kg
a)
What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor?
Express your answer to two significant figures- Newton meter
b)
What is the magnitude of the torque about his shoulder if he holds his arm straight, but 55? below horizontal?
Express your answer to two significant figures - newton meter.
torque τ = 25.24 N-m
torque τ = 12.68 N-m
given data in the qstion:mass of the ball is= 2.5 kg
arm length is l = 70 cm = 0.7 m
mass of arm is = 4 kg
solution by using data:-we get here center of mass that is
center of mass = (m1+m2) rcm =m1 r1+m2 r2
center of mass = 0.44545 m
and
the torque will be
torque τ = F × r ×sinθ
torque τ = (4+2.5)9.8 × 0.4454 × sin90
torque τ = 25.24 N-m
and now we get the magnitude of the torque
magnitude of the torque is τ = F × r ×sinθ
magnitude of the torque is τ = (4+2.5)9.8 × 0.4454 × sin60
magnitude of the torque is τ = 12.68 N-m
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The ______ model develops knowledge to observe, analyze, and critique physical activity and sport issues and topics in a variety of contexts.
The Cultural Studies model develops knowledge to observe, analyze, and critique physical activity and sports issues and topics in a variety of contexts.
Cultural Studies:
The science of comprehending contemporary society, with a focus on politics and power, is known as cultural studies. It is an all-encompassing phrase that is used to discuss a variety of topics, such as media studies like journalism and film, sociology, industrial culture, globalization, and social theory. By pursuing this field, one is attempting to unravel the human condition.
Students who want to work in the media or politics find this profession to be quite popular due to the variety of disciplines it offers. Understanding culture in connection to power is one of the goals of science. It examines the varied social and political systems found in many nations as well as how they relate to one another and the rest of the world.
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Write a hypothesis to explain why we observe a higher fraction of elliptical galaxies within a cluster and a higher fraction of spiral galaxies in the field.
Elliptical galaxies are the common form of galaxies and they are found in the universe as they lack swirling arms of their own. They are a total of 10-15% of total galaxies.
Because more elliptical galaxies are seen when specific areas of the sky are explored in depth.
What characteristics do elliptical galaxies share?The majority of elliptical galaxies are made up of older, low-mass stars with scarce interstellar space and little star formation, and they typically have a lot of globular clusters all around them.
Do elliptical galaxies revolve similarly to spiral galaxies?Elliptical galaxies really aren't supported by rotation, in contrast to spiral galaxies.The galaxy's shape is defined by the rate at which the stars move in each direction due to the unpredictable and frequently extremely extended orbits of its constituent stars.
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a student has set up the three circuits shown. the light bulbs and the batteries are identical. rank all 3 ammeters in order of their current measurements
The correct option is D) A₁ = A₂ > A₃
What is series circuit?
An easy circuit that enables electrons to move between one or more resistors is called a series circuit. A resistor is anything that consumes energy from a cell (battery). The resistor in a series circuit is typically a light bulb. The circuit is attached to the cell end to end, without any branches, in order to turn on the bulb. Any gaps or disconnections will result in the circuit malfunctioning; all circuit components should be simply connected from one end to the cell and the other end to the bulb.
In the figure, A₁ and A₂ will show same reading as they are arranged in series connection.
A₁ = A₂.
In third case there is no bulb ∴ There will be no current flow hence there will be 0 resistance affected.
So, A₁ = A₂ > A₃
Hence, Option D is correct.
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A 17.0-m-high and 11.0-m-long wall under construction and its bracing are shown in Figure 9.32. The wall is in stable equilibrium without the bracing but can pivot at its base. Calculate the force exerted by each of the 10 braces if a strong wind exerts a horizontal force of 630 N on each square meter of the wall. Assume that the net force from the wind acts at a height halfway up the wall and that all braces exert equal forces parallel to their lengths. Neglect the thickness of the wall.
The force exerted by each of the 10 braces is 2.0534 x 10⁴ N.
The force is defined as the shear stress or pressure applied per unit area.
Mathematically, F = P/ASI unit of force is Newton (N).The wall is 17.0-m-high and 11.0-m-long
Its bracing is under construction
The force is exerted by each of the 10 braces, if a strong wind exerts a horizontal force of 630 N on each square meter of the wall.
Let the net force from the wind acts at a height halfway up the wall and that all braces exert equal forces parallel to their lengths.
Considering the pivot at the base of wall.
From the equilibrium of forces, we have
r₁ * Fwind = r₁ * Fbsinθ
By substituting the values,
Fb = Fwind /10sin35°.............(1)
The wind force is also given by
Fwind = Horizontal force or pressure * Area
Fwind = F/A * hw
Fwind = 630 x 17 x 11
F wind = 117810 N
From equation (1), we have
Fb = Fwind /10sin35°
Fb = 117810 /10sin35°
Fb = 20539.54 N
0r Fb = 2.0534 x 10⁴ N
Thus, the force exerted on each of the 10 braces is 2.0534 x 10⁴ N.
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if you were drawing an imaginary solar system which of the following would most likely be best to use to determine which planet has the most moons revolving about it?
Mass and distance between planets
The acceleration of a planet in its orbit around the Sun depends upon the mass of the Sun and the inverse square of the planet's distance from the Sun. As the planet moves further away in its orbit around the Sun, the gravitational force exerted by the Sun on the planet decreases.But a planet's size is not necessarily proportional to its mass. In the end, how massive a planet is has more to do with its composition and density. So while a planet like Mercury may be smaller in size than Jupiter's moon Ganymede or Saturn's moon Titan, it is more than twice as massive than they are.
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a radioactive material produces 1390 decays per minute at one time, and 4.1 h later produces 150 decays per minute. What is its half-life?
The half-life of the radioactive material is about 2.75 hours.
To determine the half-life of a radioactive substance, we need to determine the time it takes for the number of decays per minute to decrease by a factor of two.
You can set up an expression that relates decays per minute at two time points.
1390 decays/min ×(1/2)^(t/(half-life)) = 150 decays/min
where t is the elapsed time between two measurements (4.1 hours) and (1/2)^(t/(half-life)) is the decay factor, dividing the number of decays per minute by half. reduce to
By rearranging the equation, we can solve for the half-life.
half-life = t ×log(2) / log((1390/150)^(1/t))
Substituting the values of t and the number of decays per minute at the two time points, we get
half-life = 4.1 ×log(2) / log((1390/150)^(1/4.1))
This simplifies to:
half-life = 4.1 × 0.693 / log (9.27)
=2.747 hours.
Therefore, the half-life of the radioactive material is about 2.75 hours.
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(True or False) A 5-kg chunk of aluminum and a 5-kg block of silver that are at the same temperature have the same thermal energy. Heat flows from a higher temperature to a lower temperature. Different materials need the same amount of heat to have similar changes in temperatures.
Aluminum and silver of 5 kg mass have different thermal energies at the same temperature. Heat moves from a higher to a lower temperature.
Various materials need varying amounts of heat to have similar changes in temperature. When two items with different temperatures come in contact with one another, energy moves from the hotter (higher temperature) object to the cooler (lower temperature) object until both objects reach the same temperature. Temperature change is one of the main outcomes of heat transfer: heating raises the temperature while cooling lowers it.
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Two forces F1 and F2 are acting on the box shown in the drawing, causing the box to move across the floor. The two force vectors are drawn to scale. Which one of the following statements is correct? (6.1)
(a) F2 does more work than F1 does.
(b)F1 does more work than F2 does.
(c)Both forces do the same amount of work.
(d)Neither force does any work.
The correct answer is (b) F1 does more work than F2.
The block is moving horizontally the direction is opposite to direction of motion. The two forces applied are F1 and F2.F1 is applied horizontally so its horizontal component is F1cos0 = F1
While F2 is at angle so horizontal component of F2 is F2cos(theta) and as we know cos is a decreasing in 0 to 90 degree. Therefore F1 does more work than F2.
Work is defined as the product of the magnitude of a force and the displacement of the object it is acting upon. In this case, the forces F1 and F2 are acting on the box, causing it to move across the floor. To calculate the work done by each force, we need to calculate the magnitude of the force and the displacement of the box.
The magnitude of F1 is given in the diagram, and it is 2 N. The magnitude of F2 is also given, and it is 4 N. For the displacement of the box, we will assume it is 1 m.
Now we can use the formula W = F x d to calculate the work done by each force.
For F1: W1 = 2 N x 1 m = 2 J
For F2: W2 = 4 N x 1 m = 4 J
Since F1 does 2 J of work, and F2 does 4 J of work, F1 does more work than F2 does. Therefore, the correct answer is (b) F1 does more work than F2 does.
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A desktop computer is to be cooled by a fan whose flow rate is 0.34 m^3/min. Determine the mass glow rate of air through the fan at an elevation of 3400 m where the air density is 0.7 kg/m^3. Also, if the average velocity of air is not to exceed 110 m/min, determine the diameter of the casing of the fan. Answers: 0.238 kg/min, 6.3 cm
The mass flow rate to cool the desktop computer s 0.238kg/min and if the average velocity does not exceed 110m/min the diameter of fan casing is 6.3 cm.
What is mass flow rate?
The mass of a substance that moves per unit of time is known as the mass flow rate in physics and engineering. In SI units, it is measured in kilograms per second; in US customary measures, it is measured in slugs or pounds per second. The standard symbol is m (pronounced "m-dot"), though (Greek lowercase mu) is also occasionally used. See, for instance, Schaum's Outline of Fluid Mechanics, where mass flow rate is sometimes referred to as mass flux or mass current.
Since its known to us that;
Flow rate V = 0.34 [tex]m^{3}/min[/tex]
density of air ρ = 0.7 [tex]kg/m^{3}[/tex]
average velocity of air [tex]v_{avg}[/tex]= 110 m/min
Mass flow rate is given by
m = ρ x V
m = 0.7 x 0.34
m = 0.238 kg/min
Since Flow rate can be written as
V = A.[tex]v_{avg}[/tex]
Where A denotes Area of cross-section
0.34 = [tex]\frac{\pi d^{2}}{4}[/tex][tex]v_{avg}[/tex]
0.34 =[tex]\frac{\pi }{4} (d^{2})[/tex] x 110
d = 0.0626 m
d= 62.6 = 63 mm
Thus, we conclude that mass flow rate to cool the desktop computer s 0.238kg/min and if the average velocity does not exceed 110m/min the diameter of fan casing is 6.3 cm.
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Jan Baptista van Helmont's famous experiment incorrectly showed that the plants produce most of their mass from:
Jan Baptista van Helmont's famous experiment incorrectly showed that the plants produce most of their mass from water.
In physics, mass is used to express inertia, a property common to all matter. In essence, it is the resistance of a mass of matter to changing its course or speed in response to the application of a force. The more mass a body has, the less of a change an applied force makes. Using Planck's constant, the kilogram, the ISU's unit of mass, is equivalent to 6.62607015 1034 joule seconds (SI). One kilogram is multiplied by one square meter per second to produce one joule. Since the second and the meter have already been defined in terms of other physical constants, the kilogram is determined by precise measurements of Planck's constant.
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n empty bottle has a mass of 35.00 grams. When filled with water, it has a mass of 98.44 grams. Of the same bottle is filled with a different fluid, the mass is 89.22 grams. What is the specific gravity of this other fluid
The specific gravity of the liquid is 0.85
What is specific gravity of a liquid?The specific gravity of a liquid is the relative weight of that liquid compared to an equal volume of water. It can also be called relationship density. Specific gravity has no unit
Therefore specific gravity of a liquid = weight of the liquid/ weight of water OR mass of the liquid / mass of water.
Mass of water = 98.44-35.00 = 63.44g
mass of the liquid = 89.22-35.00 = 54.22
Therefore the specific gravity of the liquid = 54.22/63.44= 0.85
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what happens when there are extreme differences in air pressure and temperatures? view available hint(s)for part a what happens when there are extreme differences in air pressure and temperatures? when there are extreme differences in air pressure and temperatures, hurricanes are formed. when there are extreme differences in air pressure and temperatures, slight winds often occur, resulting in light rain and some hail. when there are extreme differences in air pressure and temperatures, it results in a rapidly moving warm front. when there are extreme differences in air pressure and temperatures, it creates a stationary front. when there are extreme differences in air pressure and temperatures, violent storms often occur, including hailstorms and tornadoes.
Violent storms occur, including hailstorms and tornadoes. Warmer and cooler air masses are in constant motion because atmosphere is trying to equalize temperatures and pressure.
What happens when extreme differences in air pressure and temperatures occurs?High-pressure systems are generally associated with clear weather. Weather pattern characterized by low air pressure, is a result of warming. Low-pressure systems are associated with storms.
Air temperature determines amount of humidity in air mass. Colder air masses absorb less water vapor than hot air masses and the increased levels of water vapor in humid air are associated with thunderstorms and hurricanes. Wind occurs due to differences in pressure.
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