Answer:9
Explanation:
three identical uniform rods are each acted on by two or more forces, all perpendicular to the rods and all equal in magnitude. which of the rods could be in static equilibrium if an additional force is applied at the center of mass of the rod?
The question is incomplete. The complete question is attached.
Figure 3 is the right answer. The rods in the figure could be in static equilibrium if an additional force is applied at the center of mass of the rod. Because in this case net force and net torque on the rod are zero.
A static equilibrium is a state of an object when all of its parts are at rest and there is no resultant force on it. All the forces acting on an object are in balance and it is not moving with respect to the relative plane. A static equilibrium stops an object from moving. As all the forces balance each other torque acting on an object is also zero.
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A container with three necks, of different diameters and shapes, contains an incompressible liquid. Which of these three figures is correct?
Kareen weigh 800N and it at a ditance of 4m from the pivot of a eeaw. Zaid weigh 1200N. Where hould zaid it to make ure the eeaw i balanced
Zaid sits at 2 2/3m from the pivot of the sea saw to make a balance.
Here it is given that the weight of Kareen is 800N and she is sitting at 4m from the pivot of a sea-saw and Zaid is of weight 1200n.
We have to find at what distance from the pivot Zaid should sit so that there is a balance.
Here we are dealing with the Torque where one torque on one side against an equal torque of force on the other side.
Torque:
Torque is a twisting or turning force that tends to cause rotation around an axis, which might be a center of mass or a fixed point. Torque can also be thought of as the ability of something that is rotating, such as a gear or a shaft, to overcome turning resistance.
m1 = weight of Kareen
m2 = weight of Zaid
l1 = distance at which Kareen sits from the pivot
l2 = distance at which Zaid sits from pivot
m1 × l1 = m2 × l2
800 × 4 = 1200 × l2
l2 = 8/3
= 2 2/3m
Therefore the length at which Zaid sits from the pivot is 2 2/3m.
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How do you find speed from wavelength and Hz?.
Speed = Wavelength x Wave Frequency.
Wavelength is measured in meters and frequency is measured in hertz, or waves per second. Therefore, wave velocity is expressed in meters/second, which is the SI unit of velocity. Wavelength is the distance between identical points in adjacent cycles of a waveform signal propagating in space or along a wire.
For wireless systems, this length is usually expressed in meters centimeters, or millimeters. Wavelength can be defined as the distance between two consecutive peaks or valleys. Measured in the direction of the wave. The wavelength of light is an important property that determines the properties of light. Red light has a different wavelength than blue light and green light has a different wavelength from both.
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a concave mirror has the focal length equal to 0.927 m. to form a real image that is triple the size of the object on a screen, at what distance in front of the mirror should the object be placed (in m; answer a positive number)?
The object needs to be placed 0.618 meters from the concave mirror in order to obtain an image of it three times.
What do you mean by concave mirror?When it hits the concave mirror's reflecting surface, light converges at a single point and returns to the observer. It is sometimes referred to as a converging mirror for this reason.Obtaining an enlarged, upright, and virtual image requires placing the concave mirror very close to the item.A true and inverted image is created when the distance between the item and the mirror is increased, though the size of the image decreases.The size and reality of the picture created by the concave mirror are also up for debate.Given,
Focal length(f) = 0.927 m
Let the size of object is u,
Then according to question,
Size of image is 3u
For a concave mirror,
[tex]\frac{1}{f}[/tex] = [tex]\frac{1}{v}[/tex] - [tex]\frac{1}{u}[/tex]
[tex]\frac{1}{0.927}[/tex] = [tex]\frac{1}{3u}[/tex] - [tex]\frac{1}{u}[/tex]
u = -0.618 m
Distance will never be in negative.
Hence, u= 0.618 m
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a rocket achieves a lift-off velocity of 500.0 m/s from rest in 30.0 seconds. calculate the average acceleration of the rocket.
16.6 m/s² is the average acceleration of the rocket when it achieves a lift-off velocity of 500.0 m/s from rest in 30.0 seconds
initial velocity = 0
final velocity = 500 meters per seconds
time = 30 seconds
a=(v-u)/t
u = 0
v = 500 m/s
t = 30 s
Substitute these values in equation
a=500/30
a=16.6 m/s²
Acceleration is the rate of change in a moving object's speed and direction over time. When anything moves faster or slower, it is considered to be accelerating. Motion on a circle increases even while the speed is constant because the direction is always changing.
Since acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is a vector quantity as well. The definition of acceleration is the change in velocity vector during a time interval divided by the time interval.
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suppose electrons are moving at a constant velocity away from a source of microwaves. the electrons will interact with microwaves having a frequency that:
Using the theories of microwaves, we got that the electrons will interact with microwaves having a frequency that Is lower than the frequency of the waves emitted by the sources.
Microwave radiation lies close to radio-frequency radiation in the electromagnetic spectrum, with operating frequencies in the 900–2450 MHz range.
The frequency is a characteristic of the source and hence it does not change with distance.
Hence, if we suppose electrons are moving at a constant velocity away from a source of microwaves, then the electrons will interact with microwaves having a frequency that Is lower than the frequency of the waves emitted by the sources.
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Hi! can someone please help me with this simple question? ty in advance :)
Explanation:
Electric force or electrostatic force is the force between two or more charged particles.It can be attractive or repulsive because two similar charges repel each other and opposite charges attract each other.For instance a positive and a positive charge will repel each and a positive and a negative charge will attract each other.
Meanwhile gravitational force is attraction between two bodies(two masses) due to gravity.They always attract each other.The force of attraction by gravity us dependent on sqaure of distance between the two bodies and the product of their masses.
a coin is embedded 1.89 cm from the surface of a similar ball of transparent substance having radius 3.1 cm and unknown composition. if the coin's image is virtual and located 1.65 cm from the surface, find the index of refraction of the substance
The index of refraction of the substance M = 0.45 mH. The refractive index n is the ratio of the speed of light c in a vacuum to the speed of light c' in a medium.
For the system described in the statement, the induced emf in both coils is given by. In other words, the induced emf in one coil is produced by the change in current in the other coil. It can be assumed that a current of 8.0 A belongs to the second coil and an induced emf of 3.00 V develops in the first coil. The current in the second coil turns off at 1.20 ms. Using the previous information, we know: Coil is 0.45mH.
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true or false: (a) in any perfectly inelastic collision, all the kinetic energy of the bodies is lost. (b) in a head-on elastic collision, the relative speed of recession after the collision equals the relative speed of approach before the collision.(c) mechanical energy is conserved in an elastic collision
In any perfectly inelastic collision, all the kinetic energy of the bodies is lost is false statement.
Kinetic energy is a particular kind of power that is present in moving particles or objects. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force. Kinetic energy is a characteristic of motion that depends on the mass and velocity of an item or particle. Motion is any combination of vibration, axis rotation, translation, and movement (along a path from one location to another). A body's translational kinetic energy, which is determined by multiplying its mass, m, by the square of its speed, v, is equal to 1/2mv2..
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1. Draw a free body diagram showing all the force on a cart if a shopper pushes the cart with an applied force of 100 N and a friction force of 80N acts on the cart
In physics and engineering, a free frame diagram (FBD; also referred to as a force diagram) is a graphical instance used to visualize the applied forces, moments, and ensuing reactions on a frame in a given situation.
A free-body diagram is a sketch of an item of interest with all the surrounding items stripped away and all of the forces acting on the frame shown. The drawing of an unfastened-body diagram is a critical step in the solving of mechanics issues because it helps to visualize all the forces appearing on an unmarried object.
A free-body diagram is a graphic, dematerialized, symbolic representation of the body (structure, element, or segment of an element) wherein all connecting "pieces" have been removed. An FBD is a convenient method to model the structure, structural detail, or phase that is under scrutiny.
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How do you know if forces are unbalanced? Balanced?
Unbalanced:
Balanced:
Whenever an object's motion varies, the pressures are out of equilibrium. Forces are balanced when they are conducted in the opposite direction and are of equal size.
What would you say is a force?Physics defines force as: The pushing and pulling that alters the velocity of a massed object. A agent with both the capacity to alter a bodies natural resting and moving condition is called as an external force. It has both a magnitude and a direction.
What causes balancing force?Force symmetry Balanced forces are those that have opposing directions and equal sizes. One definition of equilibrium is a state of balance forces. When the forces are in balance, there is really no need to alter your strategy.
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what are the relevant similarities and differences between paley's watch and the universe? is the watch analogy a good one? why or why not?
This is a theory by William Paley that states if something exists, it must have been someone who created it. By this theory, Paley concluded that the universe and the watch have been created similarly even though they are systematically different.
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6) Santa's sleigh flies at 3 times the
speed of sound. That's a
whopping 1.04 x 10 m/s. Santa's
sleigh actually makes a Sonic Boom
when it surpasses the speed of
sound! (keep your ears open for
that on Christmas Evel). How
much kinetic energy must Santa's
sleigh have if its mass is 7,500 kg?
(Let us assume he is not carrying
ALL 7.5 billion presents at once!)
Kinetic energy must Santa's sleigh have if its mass is 7,500 kg is 405600 joule.
What is kinetic energy?
The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it. We must put in effort in order to apply a force. Following work, energy is transmitted to the item, which causes it to move at a new, constant speed.
Kinetic energy = .5 m*v²
K E = .5 * 7500*(10.4)²
K E = 405600 joule.
Kinetic energy must Santa's sleigh have if its mass is 7,500 kg is 405600 joule.
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If the heat of a reaction is measured at constant pressure, it is equal to a change in.
The change in the system's enthalpy equals the heat produced or absorbed by a chemical process occurring at constant pressure.
Following is a summary of the link between the enthalpy of reaction and the change in the system's internal energy during a chemical reaction.Most chemical reactions take place at atmospheric pressure, which is constant, therefore the heat of reaction under constant pressure is known as enthalpy (H), as in H=U+PV.The enthalpy change is precisely equal to the heat transmitted to the system if the sole work performed is a change in volume at constant pressure.The temperature at a given volume is directly proportional to the pressure of a given quantity of gas. A system's pressure increases when its temperature rises and vice versa. The Gay-law Loussac's establishes the link between pressure and temperature of a gas.To know more about enthalpy
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star a is a red star. star b is a blue star. you are able to determine that both stars are the same size. which star is brighter?
We also need the information about the distance between these stars to find out which star was the brighter star among these stars.
what is star defined as?
Stars are created as clusters within massive gas clouds that collapse in on themselves, according to current star formation theories. The substance of the cloud warms up as it sinks inward due to the force of gravity.
When the temperature of the gas hits around 10 million K (18 million °F), hydrogen nuclei begin to fuse into helium nuclei, and the star is formed. Nuclear fusion energy flows outward from the star's core, slowing the collapse of the gas cloud.
The temperature of a star determines its colour: hotter stars radiate bluer light, whereas cooler stars emit redder light. Temperature is also connected to mass. Red dwarf stars have as little as 0.075 solar masses and a visible surface temperature of less than 4,000 K. R136a1, a Wolf-Rayet star 265 times the mass of the Sun, with a visible surface temperature of 50,000 K.
The most massive (and hottest) stars use up their energy source in a few million years, but small and cold red dwarf stars can burn for billions of years.
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what creates a magnetic field? more than one answer may be correct. a difference in electric potential a charged capacitor disconnected from a battery and at rest a moving object with electric charge a stationary conductor carrying electric current a stationary object with electric charge
Electricity can be applied to a wire to produce a magnetic field.
Charged particles that are in motion produce all magnetic fields. Due to the continually moving electrons inside, even the magnet on your refrigerator is magnetic.Magnetic field can be defined as the area around a magnet in which the effect of magnetism is felt.
Magnetism is the strongest attractive force which occurs when any metallic substance lies around a magnet or magnet like substances.Magnetic compass needles and other permanent magnets line in the direction of magnetic fields similar to those found on Earth. Electrically charged particles are forced to move in a circular or helical path via magnetic fields. The operation of electric motors is generated by this force, which is applied to electric currents in wires in a magnetic field.To know more about magnetic field,
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An object i dropped from ret and fall freely 20. Meter to Earth. When i the peed of the object 9. 8 meter per econd?
Answer:
The speed of the object is 9.8 meters per second after one second of free fall. In that one second, the object travels 4.9m.
Explanation:
On Earth, acceleration due to gravity is 9.8[tex]\frac{m}{s^2}[/tex]. Use kinematic equation #1 to find the time it takes this object to achieve the given speed (v).
[tex]v=v_0+at\\a=9.8\frac{m}{s^2}\\v_0=0\frac{m}{2}\\v=9.8\frac{m}{s}\\9.8\frac{m}{s}=0.0\frac{m}{s}+(9.8\frac{m}{s^2})t\\t=\frac{9.8\frac{m}{s}}{9.8{m}{s^2}}\\t=1 s[/tex]
This is intuitive. The velocity of an object in free fall gains 9.8[tex]\frac{m}{s}[/tex] per second unless acted upon by an outside force.
To find how far the object has fallen, insert the given and derived values into kinematic equation #2.
[tex]\Delta y=(\frac{v+v_0}{2})t\\\Delta y=(\frac{9.8\frac{m}{s}+0.0\frac{m}{s}}{2})(1 s)\\\Delta y=4.9m[/tex]
Hope that helps.
describe how the volume of blood returning to the heart and entering ventricles affect cardiac output
Answer:
Greater end-diastolic volumes of blood returned to the heart, increase the passive stretching of the heart muscles. This in turn results in the ventricles contracting with more force- a phenomenon called the Frank-Starling law of the heart.
we can rule out a connection between changes in the sun's luminosity and the global warming that is currently occurring on earth because
Answer: This happens because the mechanism by which increasing Solar luminosity causes atmospheric CO2 to decline is temperature dependent.
Explanation: Increasing solar luminosity raises the temperature of the planet, increasing the rate of weathering, which exposes crustal rock to the atmosphere. Atmospheric carbon dioxide reacts with that exposed rock to form carbonate minerals, which removes the CO2 from the atmosphere.
This in turn lowers the greenhouse effect and lowers the planet’s temperature, maintaining an equilibrium temperature despite the increased solar luminosity.
A negative feedback loop.
But because solar luminosity is in fact greater, Earth cannot cool to BELOW its prior equilibrium and thus a snowball Earth cannot really occur by this mechanism alone.
But once CO2 is sufficiently exhausted from the atmosphere such that further lowering it levels no longer decreases the greenhouse effect, the temperature buffer effect ends, and Earth’s temperature starts to rise.
Once it rises past a certain point, carbonate minerals are no longer stable. Exposed bedrock no longer reacts with atmosphere CO2. Instead, the REVERSE happens. All the previously made carbonate minerals now decompose and RELEASE CO2 back into the atmosphere.
The greenhouse effect now increases despite the Earth already being warmer, making it even warmer.
A POSITIVE feedback loop.
Which in turn makes the carbonate minerals even more unstable, which increases the CO2 release rate even more, which increases the temperature even more.
Thus a runaway greenhouse effect commences.
the telescope in space that allowed astronomers to find thousands of exoplanets and exoplanet candidates by making very careful measurements during a planet transit was called:
The telescope in space that allowed astronomers to find thousands of exoplanets and exoplanets was called The Kepler space telescope.
What is a telescope?Telescope: a tool for creating magnified pictures of far-off objects. The telescope is without a doubt the most significant research tool in astronomy. It offers a way to gather and examine radiation coming from astronomical objects, even those at the edge of the cosmos.
The Kepler space telescope discovered hundreds of exoplanets and exoplanet candidates during the course of its four years of photometric surveys. The confirmation and characterization of hundreds of multi-planet systems via transit timing variations are one of Kepler's biggest legacies (TTVs).
Therefore, the telescope in space that allowed astronomers to find thousands of exoplanets and exoplanets was called The Kepler space telescope.
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a 4.50 g bullet pierces a sand bag 22.0 cm thick. if the initial bullet velocity was 224. m/s and it emerged from the sandbag with 24 m/s, what is the average magnitude of the friction force the bullet experienced while it traveled through the bag?
The average magnitude of the friction force the bullet experienced while it traveled through the bag is 12.375 N.
Energy conservation is the decisions and practices to use less energy. Turning off lights when leaving a room, unplugging appliances when not in use, and walking instead of driving are examples of energy conservation. To solve this problem, we can use the law of conservation of energy. We know that the bullet he enters at 39 m/s and exits at 27 m/s, losing some energy. This can be modeled by the energy equation of motion. "U" is the energy lost when the bullet passes through the bag. Then, solving for U, we find that the bag is 48 cm thick and F * d = W by rearranging:
F = 12.375 N
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of the following locations where do clocks run slowest? a. on the surface of a 2 solar mass neutron star. b. on the moon. c. on the surface of the sun.
Of the given locations, the clocks run slowest on the surface of a 2 solar mass neutron star.
Acceleration due to gravity on earth = 9.8 m / s²
Acceleration due to gravity on moon = 1.62 m / s²
Acceleration due to gravity on 2 solar mass neutron star = 19.6 * [tex]10^{11}[/tex] m / s
Acceleration due to gravity is the force which an object in its gravitational field will experience.
Higher the the acceleration due to gravity, stronger will be the gravitational field. Stronger the gravitational field, slower the time will pass. Since g value on 2 solar mass neutron star is higher, gravitational field there will be stronger than Earth and the Moon.
Therefore, the clocks run slowest on the surface of a 2 solar mass neutron star.
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Polyurea is a synthetic material that is often used as a waterproof coating. Polyurea is useful because it is not reactive chemically. This means it does not break down easily.
Considering this information, what is likely a negative impact of polyurea?
A.
It has toxic effects on nearby wildlife.
B.
It does not break down after it is disposed of.
C.
It damages materials that it comes in contact with.
D.
It needs to be reapplied to surfaces frequently.
The negative impact of polyurea is It needs to be reapplied to surfaces frequently. Option D.
Studies have shown that polyurea coatings can increase the deflection of steel components, especially when applied to the exterior facing the blast. Polyurea is a commonly used polymer in moisture-resistant coating systems. Polyurea does not emit CO2 or other harmful gases during manufacturing or use.
Basic components can be manufactured in a climate-neutral manner using renewable energy allowing timely action to be taken regarding the ecological footprint as well. Cured polyurea has a high glass transition temperature and heat distortion temperature, but will burn when exposed to an open flame. It will self-extinguish when the flame is removed. Polyurea coatings provide a fast-curing durable flexible protective barrier that prevents water damage and harmful chemicals from destroying virtually any structure.
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3
Steam machines are used to sterilise kitchen work surfaces.
Calculate the energy needed to change 0.06 kg of water into
steam.
S
The latent heat of vaporisation for water is 2 260 000 J/kg.
Use the correct equation from the Physics Equations Sheet.
Answer:
See below
Explanation:
2 260 000 J/kg * .06 kg = 135600 j
Kinetic energy depends on what?
Mass and speed
Heat and pressure
Position and height
Density and volume
Kinetic energy depends on mass and speed.
What is kinetic energy?The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object in order to accelerate it. We must put in effort in order to apply a force. Following work, energy is transmitted to the item, which causes it to move at a new, constant speed.
Here given in the question greatest kinetic energy is when body have maximum velocity that is when body fall from maximum height at the point before touching ground body have maximum velocity.
Kinetic energy depends on mass and speed.
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calculate the frequency of radiation that has a wavelength of 5.23 x 10^-4 m. answer in scientific notation with units of hz.
The frequency of radiation that has a wavelength of 5.23 x 10^-4 m is
57.36 x 10¹⁰ Hz.
Light's wavelength and frequency are inversely proportional to one another.
Light waves with the highest frequencies have the shortest wavelengths, and those with the lowest frequencies have the longest wavelengths.
Formula:
Speed of light = wavelength × frequency
c = λ × f
f = c / λ
The speed of light = 3×10⁸ m/s
a wavelength of radiation = 5.23 x 10⁻⁴m
To calculate the frequency of the radiation :
f = c / λ
using values of c and λ we get,
f = (3×10⁸ m/s) / ( 5.23 x 10⁻⁴m)
f = 0.5736 x 10¹² Hz
f = 57.36 x 10¹⁰ Hz
The frequency of radiation that has a wavelength of 5.23 x 10^-4 m is 57.36 x 10¹⁰ Hz.
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To outside observers at rest, the overall sizes of objects traveling at relativistic speeds are.
The overall sizes of objects traveling at relativistic speeds are smaller.
The term "relativistic speed" describes the rate at which relativistic effects are important for the intended accuracy of measurement of the phenomenon being observed. The differences between values determined by models that take relativity into account and those that do not are known as relativistic effects. Velocity, rapidity, and celerity are all adjectives that have a similar meaning. Speed is a scalar since it is the size of the velocity vector, or four-velocity in relativity and three-velocity in Euclidean space. Average speed is how speed is objectively determined, although modern, widely used equipment can estimate speed over extremely short time intervals and get very near to instantaneous speed. Cosine error, which happens in speed detection systems when only one scalar component of the three-velocity is measured, and the Doppler effect, which could affect
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sketch the rbs spectrum as accurately as possible noting the absolute energy positions of the mo, si and n peaks as well as the carbon substrate.
An ion scattering method called Rutherford backscattering spectrometry (RBS) is used to analyze the composition of thin films.
What is the principle of RBS?Using the same methodology as ISS, Rutherford backscattering spectroscopy (RBS, named after British physicist Ernest Rutherford) measures backscattering. It is possible to determine the mass of the scattering atom in a sample by measuring the energy and angle of an elastically scattered primary ion beam.When waves, particles, or signals are reflected back in the direction they came from, that is backscattering (or backscatter). According to another definition, backscattering is a phenomenon that happens when radiation or particles scatter at angles greater than 90 degrees from their original direction of motion.To Learn more About RBS refer to:
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An object falls over a very high cliff. After several seconds, even though it is still falling, it is no longer accelerating. What is happening? Which law best describes this?
An object falls over a totally high cliff. After several seconds, although it is still falling, it is not accelerating as it attained terminal velocity.
the best pace that an item can also attain because it descends is known as terminal pace. because the outcomes of air resistance on various objects vary relying on their shapes, the terminal pace pace can be exceptional for each object.
An item will acquire its most velocity while it falls from a low peak however this is not the terminal velocity given that if the object had been allowed to fall for longer, it'd have continued to advantage speed. If an item turned into dropped from a top two times as wonderful, the terminal velocity might continue to be the same.
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