The energy produced by the heart in a day when the power output of the heart is given is calculated to be 1.15 × 10⁵ J.
Given that,
Power output of human heart = 1.33 W
Time in one day = 24 hours = 24×60 min = 24×60×60 s = 86400 s
Energy produced by heart in a day = ?
The expression for energy, power and time is given as, E = P t
where, P is power
t is time
E is energy
The energy it produces is equal to the power output times the time the heart does work.
E = P t = 1.33 × 86400 = 1.14912 × 10⁵ J ≈ 1.15 × 10⁵ J
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a 10kg block with an initial velocity of 10m/s slides 10m across a horizontal surface and comes to rest. it takes the block 2 seconds to stop. the stopping force acting on the block is about:
The block is stopped by an opposing stopping force of roughly 50 N over a horizontal surface, and it comes to rest.
What is the scientific definition of force?The concept of "force" has a specific definition in science. This kind of force may be represented as both a push and a pull. It cannot hold an item or a force, nor can it hold a force.
Which forces are there?These sorts of forces are there whenever two things interact and work together. Contact forces can include, but are not limited to, tension, normal, air resistance, applied, and spring forces.
v² - u² = 2as
(0)² - (10)² = 2 × a × 10
-100 = 20a
a = -100/20
a = -5 m/s²
Acceleration (a) = -5m/s²
Now,
Force (F) = Mass(m) × Acceleration (a)
F = m × a
F = 10 × -5
F = -50 N
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what is the difference between assessing the speed of a block sliding down an inclined plane versus a steel spere rolling down an inclined plane?
A tilted surface is referred to as an inclined plane in physics. A known imbalanced force causes objects to accelerate down inclined planes.
If there is no net force acting on an object, it will slide down an inclined plane at a constant speed. Translational kinetic energy, which is equal to half the object's mass times the square of its velocity, is a form of kinetic energy that slides have. Rotational kinetic energy is a special kind of kinetic energy that is present in rotating objects like spinning tops. An object in motion has kinetic energy in both directions, translation and rotation. Since the steel sphere is circular and moves more quickly than a block, it reaches the bottom first.
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the hanging mass is referred to as m and it sets the centripetal force. T/F
The given statement that hanging mass is referred to as m and it sets the centripetal force is, false.
What's Centripetal force?Centripetal force is the force acting on an object in curvilinear shifting directed towards the axis of rotation or centre of curvature. Any shifting in a bending path represents accelerated motion, and requires a force directed toward the center of curve of the path.
The centripetal force is delivered by the tension in the string, not the hanging mass. The hanging mass, m, creates a gravitational force pulling downward, but it's the tension in the string pulling the mass towards the center of the circle that provides the centripetal force.
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an uneven arrangment of electrons and protons on a circular arc of radius with angles what are the magnitude and direction of the net electric field produced at the center of the axis
Without more information on the specific arrangement of electrons and protons, it is not possible to determine the magnitude and direction of the net electric field produced at the center of the axis. The electric field is determined by the distribution of charges and their relative positions.
What is an electric field?
An electric field is a force field that surrounds an electric charge, which exerts a force on other charges within the field. The strength of the electric field is represented by the electric field strength (E) and is measured in units of newtons per coulomb (N/C). The direction of the electric field is defined as the direction that a positive test charge would be pushed or pulled if placed in the field. The magnitude of the electric field at any point in space is defined as the force experienced per unit charge, at that point. Electric fields can be created by a variety of sources, including stationary charges, moving charges, and changing magnetic fields.
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Part A
What is the mean free time between collisions for electrons in an aluminum wire?
= _____________ s
Wrong answers: 6.97*10^-9 and 1.26*10^-9
Part B
What is the mean free time between collisions for electrons in an iron wire?
=______________ s
Wrong answers: 1.40*10^-9 and 3.67*10^-10
The mean free time between collisions for aluminum wire is
1.62 * 10^-20 s and the mean free time between collisions for Iron is
1.68 * 10^-20 s.
What are electrons?Electrons are subatomic particles that carry a negative electrical charge. They are found outside the nucleus of an atom and are responsible for chemical reactions, electrical conductivity, and magnetism.
The mean free time between collisions for electrons in a metal wire can be calculated using the mean free path (λ) and the electron density (n) of the metal. The mean free time between collisions is given by the equation:
τ = λ / v
Where τ is the mean free time, λ is the mean free path, and v is the velocity of the electrons.
Using the formula, we can calculate mean free path:
λ = 1 / (n * σ)
Where σ is the collision cross-section, which is a measure of how likely it is for an electron to collide with an atom in the metal.
For aluminum, the mean free path is approximately:
λ = 1 / (n * σ) = 1 / (8.49 * 10^28 * 2.82 * 10^-15) = 3.51 * 10^-14 m
For aluminum, the mean free time between collisions is:
τ = λ / v = 3.51 * 10^-14 m / (2.18 * 10^6 m/s) = 1.62 * 10^-20 s
For Iron, the mean free path is approximately:
λ = 1 / (n * σ) = 1 / (8.05 * 10^28 * 2.82 * 10^-15) = 3.65 * 10^-14 m
For Iron, the mean free time between collisions is:
τ = λ / v = 3.65 * 10^-14 m / (2.18 * 10^6 m/s) = 1.68 * 10^-20 s
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A person starts driving and travels 3 km east to a store. the person then turns around and travels 1 km west to another store. finally, the person travels 2 km west, back to the starting point.
what is the magnitude of the displacement this person traveled?
Answer:
D(displacement) = 3 km E + 1 km W + 2 km W = 0
Total displacement (vector) = 0
Total displacement (scalar) = 6 km
magnitude implies a total displacement of 6 km
the distance to the moon is 3.84*10^8m calculate how much time it takes for a beam of light to travel this distance
It takes 1.28s for the light to travel from the moon to earth.
What is light Year?
In a vacuum, light moves at a speed of 186,000 miles or 300,000 kilometres per second. Light can circle the Earth seven times in a single second to give you a quick idea of how fast this is! The speed of light is used by astronomers to calculate how far away in space an object is. Light-years are units used to describe the distance that light can cover in a year (ly).
A light-year is a measurement of length.
It is the distance that a light photon covers in a single Julian year in the vacuum.
by the letter ly
One light year has a fixed value.
The speed of light (c) is constant everywhere, it is
299,792,458m/s=299,792.458km/s
Therefore, it takes 1.28s for the light to travel from the moon to earth.
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a football player can accelerate at 2 m/s2. if he starts from rest, how long will it take him to travel 16 m?
It will take 8 m/s to travel the distance.
What is acceleration?The rate at which an object's velocity with respect to time changes is referred to as acceleration in mechanics. It is a vector quantity to accelerate (in that they have magnitude and direction).
The direction of the net force acting on an object determines the direction of its acceleration. According to Newton's Second Law the amount of an object's acceleration is the combined result of two causes:
According to the materials used to make the object, the magnitude of the net balance of all external forces acting on it is inversely proportional to its mass, but the magnitude of the net resulting force is directly proportional to the net force.
Therefore, It will take 8 m/s to travel the distance.
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Which of the following statements is true about fluorescent lighting
The statement "The excitation of the mercury vapor glows the phosphorus coating inside the lamp of a fluorescent lighting." is true.
In a fluorescent lamp, the electric current excites the mercury inside the lamp which is in vapor form. This process generates the ultraviolet light wave of very short wavelength, which causes the glow of phosphorus coating inside the lamp. Thus a fluorescent lamp converts the very little electrical energy into useful and sufficient light energy.
--The given question is incomplete, the complete question is "Which of the following statement is true about fluorescent lighting? a) Phosphorus coating inside the lamp of a fluorescent lighting glows by the excitation of the mercury vapor. b) The efficiency of fluorescent lighting is much low."
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while in europe, if you drive 113 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 32.0 mi/gal ? assume that 1 euro
The 80.50 dollars would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 32.0 mi/gal.
One mile is how many kilometres?To convert a given amount expressed in terms of unit miles to unit kilometres, use the miles to km formula. There are 1.6 kilometres in a mile.
What is a euro?The currency and monetary unit of the European Union is the euro, denoted by the sign €. Prior to being released as currency notes and coins in 2002, it started out as a noncash monetary unit in 1999. The national currencies of participating EU members and certain non-EU states were replaced by the euro.
Calculation:
Total km so 113km per day for 7 days is 791 km.
Then we change 791km to miles = 491.211 miles.
Since the car is 32 miles per gallon we divide 491.211/32= 15.35 gallons.
We change gallons to liters so we have 15.35gal x 3.785L= 58.09 L
At 1.10 euros per liter is 58.09 x 1.10 = 63.89 euros.
Assume 1 euro =- 1.26 dollars
Change euros to dollars 63.89 x 1.26 = 80.50 dollars.
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Part A What is the strength of the magnetic field at the center of the loop in the figure? (Figure 1) Express your answer to two significant figures and include the appropriate units.B= Value SubmitProblem 32.48 Assume that I=4.8A and d = 1.6cm.
The equation B=μ0I/2R, where R is the loop's radius, describes how strong the magnetic field is in the loop's center. The direction of the field with regard to the loop is provided by RHR-2. so, B= [tex]9.65097263\times10^{-6}[/tex]
The magnetic field strength is one of two metrics used to describe a magnetic field's intensity.
Technically, a difference is made between magnetic field strength H, measured in amperes per meter (A/m), and magnetic flux density B, commonly known as teslas, measured in Newton-meters per ampere (Nm/A) (T).
The magnetic field is depicted by magnetic field lines. The field strength and the density of the field lines are correlated.
The total number of magnetic field lines in a particular area is known as the magnetic flux.
B=[tex]=4\Pi \times 10^{-7}\times 4.8 \times 1.6[/tex]
B= [tex]9.65097263\times10^{-6}[/tex]
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Unpolarized light with intensity 350 W/m^2 passes first through a polarizing filter with its axis vertical, then through a second polarizing filter. It emerges from the second filter with intensity 126 W/m^2 .What is the angle from vertical of the axis of the second polarizing filter? Express your answer to two significant figures and include the appropriate units.
The angle from vertical of the axis of the second polarizing filter is found to be be 32.9°.
Why would you use a polarizing filter?Your camera's polarizing filter reduces sparkling reflections. The same principles apply to polarising sunglasses. Your eyes are shielded from glare from the road or water by polarising sunglasses. Sunglasses that are polarising can be identified. When unpolarized light strikes a polarizer, the amount of polarised light that emerges is half that of the unpolarized light that struck the polarizer in the first place.
=> I1= 350/2 = 175 w/m2.
I2 = I1 cos^2 Ф
Ф=> cos^-1 (sqrt (I2/I1))
=> cos^-1 (sqrt(126/175))
=> 32.9°.
What components make up unpolarized light?Short electromagnetic wave bursts released by several atoms make up unpolarized light. Similar to polarized light, these bursts' electric field directions are random around the wave's path of travel but perpendicular to it.
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The potential due to a point charge Q at the origin may be written as V=Q4πϵ0r=Q4πϵ0x2+y2+z2√
Calculate Ex using equation Ex=−∂V∂x.
Express your answer in terms of the given quantities and appropriate constants.
Part B
Calculate Ey using equation Ey=−∂V∂y.
Express your answer in terms of the given quantities and appropriate constants.
Part C
Calculate Ez using equation Ez=−∂V∂z.
Express your answer in terms of the given quantities and appropriate constants.
Part D
Show that the results of parts (a), (b), (c) agrees with the equation for the electric field of a point charge E⃗ =14πϵ0qr2r^.
The value of Ex = - (Q/(4πε0)) *(x/r³), Ey = - (Q/(4πε0)) ×(y/r³), Ez= - (Q/(4πε0)) ×(z/r³) , for the potential due to a point charge Q at origin.
What is potential of a point charge?At infinite distance when an electric charge isn't under the influence of the point charge, the potential is defined as zero. Electric potential at a given position is the quantum of work that has to be done to bring the charge at a finite distance from the point charge.So, the electrostatic potential from a point), at a distance r is given by,
U = 1/4πε0Qr
Both theunit charge and the point charge are positive. So, the work has to be done against the electrostatic force. Therefore, the potential is positive. However, still, if the point charge had negative value, then in that case potential would have been negative.
A) To calculate Ex, we take the partial derivative of V with respect to x: Ex = - ∂V/∂x = - (Q/(4πε0)) × (x/r³)
B) To calculate Ey, we take the partial derivative of V with respect to y: Ey = - ∂V/∂y = - (Q/(4πε0)) × (y/r³)
C) To calculate Ez, we take the partial derivative of V with respect to z: Ez = - ∂V/∂z = - (Q/(4πε0)) × (z/r³)
D) To show that the results of parts (a), (b), (c) agrees with the equation for the electric field of a point charge, we can use the equation for the electric field of a point charge E→ = (Q/(4πε0r²)r^. We can see that, Ex = -(Q/(4πε0))×(x/r²) , Ey = -(Q/(4πε0))×(y/r²), Ez = -(Q/(4πε0))×(z/r²) which is equivalent to the formula for the electric field of a point charge E → = (Q/(4πε0r²)) ^r. So, the results of parts (a), (b), (c) agrees with the equation for the electric field of a point charge.
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At time t ! 0, a ball is struck at ground level and sent over level ground.The momentum p versust during the flight is given by Fig. 9-46 (with and ). At what initial angle is the ball launched
The graph leads us to conclude that the horizontal velocity of momentum is 4.0 kg/m/s. Additionally, the momentum's initial magnitude, p0, is 6.0 kg/m/s.
In physics, what is a momentum?
Momentum is characterised as the intensity of a body's motion.As momentum depends on both velocity and the orientation of the body's motion, it is quantified by "mass velocity". Since motion is a vector and mass is a scalar, momentum is a vector. Mass times speed equals momentum.
What does the word "momentum" mean?
Momentum can be viewed as a body's "power" while it is moving, or the amount of force it can exert on another body. For instance, a fastball (small mass) thrown quickly has the same inertia as a bowling ball (big mass) going extremely slowly (low velocity) (high velocity).
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A box of mass m hangs by a string from the ceiling of an elevator that is accelerating upward.1) Which of the following best describes the tension T in the string?T < mgT = mgT > mg2) A block sits at rest on a horizontal frictionless surface. Which of the follwoing sketches most closely resembles the correct free body diagram for all forces acting on the block. Each red arrow represents a force.A,B,C, or D?3) Briefly describe the forces represented by each of the arrows in your choice for the above question.
A is the correct answer. The arrow pointing up in A represents the force of gravity (mg).
What is force?Force is an external influence that can change the motion, direction, shape, and/or energy of a physical object. It can be a push, a pull, or a twist, and it can act on an object at a distance. Force is a vector quantity, meaning that it has both magnitude and direction.
The arrow pointing to the right represents the normal force (N), which is the force that the surface exerts on the block in order to keep it from sinking into the surface due to gravity. The arrow pointing down in A represents the frictional force (f), which is the force that the surface exerts on the block in order to prevent it from sliding along the surface.
1)
T > mg
The force due to tension acts upwards on the box and the force due to gravity acts downwards on the box. As the box is accelerated upwards then the T should be greater than the weight of the box.
ma = T - mg
mg = T- ma
Therefore, T> mg
2)
The option A, best describes the free body diagram.
3) In option A, the normal force is equal to the weight of the block which is kept at rest. N = mg
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The “street” automobile with the greatest acceleration is the Tempest. It has an acceleration of 7 m/s2. Suppose the car accelerates from rest to a final speed of 28 m/s. How long does it take the Tempest to reach this speed?
The time required for the car to accelerate from rest to a speed of 28 m/s is 4 seconds.
What is Acceleration?Acceleration is the rate of change of velocity of an object with respect to the time taken. An object's acceleration is the net result of any and all the forces which are acting upon the object, as described by the Newton's Second Law of Motion. The SI unit for acceleration is meter per second square (m/s²).
Acceleration is the rate of change in the velocity of an object.
a = (v-u)/t
a = 7m/s²
v = 28m/s
u = 0m/s
t = ?
t = (v-u)/ a
t = (28-0)/ 7
t = 28/ 7
t = 4 sec
The time taken to reach the speed of 28 meter per second is 4 seconds.
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This table displays information about position and time. What was the average speed of the baseball from the time it left the pitcher's hand to the time it was 7. 2 m from the pitcher's hand? question 10 options: 25. 7 m/s 50. 7 m/s 30. 2 m/s 20. 5 m/s.
The baseball moved at an average speed of 25.7 m/s from the moment it left the pitcher's hand until it was 7.2 meters away. As a result, choice (A) is the right response.
The object's average speed is the total distance it travels in a predetermined amount of time. It has a scalar value. It is characterised by the magnitude and lacks direction. You can calculate it by dividing the total distance travelled by the total amount of time needed to travel that distance.
Following are the calculations for baseball's typical speed:
the distance the ball travelled is 7.2 metres
the time taken is 0.28 seconds
Speed = Distance/Time.
Speed =7.2/0.28
=> 25.7 m/s.
Consequently, the baseball's average speed from the moment it left until it arrived was 25.7 m/s.
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the ld50 of cupric sulfate is 300mg/kg. if a person weighs 100kg, how many grams of cupric sulfate would that person need to ingest to reach the ld50?
To attain the ld50, the individual would need to consume 30 grams of cuprous sulfate, according to the query.
What is weight in kg?The International Units System (SI) uses the kilogram (sometimes known as the kilogramme) as the mass measurement unit. It is a measuring unit that is widely used in research, engineering, and trade from around globe. Its meaning is "1,000 grams."
Do you meant 5 kilos or kgs?Since the metric (SI) system employs numbers rather than words, the sign for kilograms (kg) does not require a s when used in the plural. Cement weighs 25 kilograms each bag (not 25 kgs).
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Even though ome thing may be impoible uch a raining cat and dog, and human turning into a different pecie, realitically, it can happen but at a very extremley low percent?
In the above case, It is not possible for it to rain cats and dogs as it is a figure of speech and not a literal occurrence. Similarly, humans cannot turn into a different species as it goes against the laws of science .
What is the species about?
The statement above is not entirely accurate. Raining cats and dogs is a phrase used to describe heavy rain, it is not a real phenomenon. And humans cannot turn into a different species, it is a biological impossibility.
What does it imply when it says it's raining cats and dogs?
Consequently, a storm with strong winds (cats) and heavy rain may be described as "raining cats and dogs" (cats). Greek word cata doxa, which means "contrary to experience or conviction," may have been the source of the phrase "cats and dogs." It is raining exceptionally or ridiculously hard if it is raining cats and dogs.
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Materials: Calculator
1. In the table below, you are given the height from which various objects fell and the time it took for those objects to fall on
Earth, the moon, and Mars. Use the data to calculate the acceleration due to gravitational force at each location.
Distance (m)
Time (s)
Acceleration due to gravity (m/s²)
Average g value for the location (m/s²)
Earth
2.25
0.680
3.08
0.793
Moon
Mars
4.04
4.57
4.68 3.55
2.20 2.26 1.58
1.38
2. What to submit:
a. Your completed table with calculations for acceleration due to gravitational force and the average value.
b. All work shown for your calculations.
Answer:
3.08
Explanation:
a pendulum has a period of 6.00 seconds on earth. the gravitational acceleration on the surface of jupiter is 26 m/s2. determine the period of this pendulum on the surface of jupiter.
The period of this pendulum on the surface of Jupiter is 3.68 sec.
How is the acceleration due to gravity determined?An object is drawn toward the earth's core by the force of gravity. The acceleration brought on by gravity is 9.8 m/s2 on earth. The formula used to determine the acceleration brought on by gravity is g = GM/r2.
How are gravitational difficulties resolved?Using Newton's equations, we may determine the gravitational pull between two objects. F = G (M x m) / r squared, where M is the mass of one item, m is the mass of the other object, and r is the separation between the centers of the two masses, is the formula for Newton's law of gravitation.
Given:
Period of the pendulum on the Earth = T_e = 1.70 s
Gravitational Acceleration of the Earth = g_e = 9.8 m/s²
Gravitational Acceleration of the Mars = g_m = 3.71 m/s²
[tex]T_m=\sqrt{\frac{g_e}{g_m} } *T_e[/tex]
[tex]T_m=\sqrt{\frac{9.81}{26} } *6[/tex]
[tex]T_m=\sqrt{0.377} *6[/tex]
[tex]T_m=3.68s[/tex]
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the nuclear mass of 32s is 31.9633 amu. calculate the binding energy per nucleon for 32s.
Now, the binding energy per nucleon, DeltaE / 32 nucleons for S = 4.36 x 10-11 J / 32
Calculating:Now, calculating the theoretical mass of 32S,
32S contains 16 protons and 16 neutrons,
Also, we know,
Mass of proton = 1.00728 amu
Mass of neutron =1.00866 amu
1 amu = 1.66 x 10-27 Kg
Thus,
Mass of protons = 16 x 1.00728 amu = 16.1165 amu
Mass of neutrons = 16 x 1.00866 amu = 16.1386 amu
The theoretical mass of 32S = 16.1165 amu + 16.1386 amu = 32.2550 amu
Now, the mass difference (\Deltam) = Theoretical mass - Actual mass
Deltam = 32.2550 amu - 31.9633 amu
Delta m = 0.2917 amu
Converting amu to Kg,
= 0.2917 amu x (1.66 x 10-27 Kg / 1 amu)
Deltam = 4.8443 x 10-28 Kg
Now, we know the formula,
DeltaE = \Deltam x c2
Here, c = 3.00 x 108 m/s
Substituting the known values,
DeltaE = 4.8443 x 10-28 Kg x (3.00 x 108 m/s)2
DeltaE = 4.36 x 10-11 J
What is the nucleon-specific binding energy?The least amount of energy necessary to separate or break down an atom's nucleus into the subatomic particles that make it up is known as nuclear binding energy (which are protons and neutrons).
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a blue-ray drive has a maxximum speed of 10,000 revolutions per minute. if a blu-ray disc has a diameter of 12 cm, what is the linear speed
The linear speed will be 24π
To find the linear speed in (km/hr) Use conversion as follows
1 km = 100000 cm
1 hr = 60 min
radius of a disc(r) = a point from a center of a disc = 5 cm
= 5/100000
=0.00005km
=5 × 10⁻⁵
Angular speed of the drive can be found as
ω= 2πr / T
where v is the angular speed and T is the time for 1 revolution.
T= 1/n ; where n is the revolution per min.
Substitute the given values we have;
ω =4000×2π × 5 × 10⁻⁵
Simplify:
ω= 4 × 10⁻¹ π km\min
1 hour = 60 minutes.
then;
ω = 60 ×4 × 10⁻¹ π
ω = 24 × 10⁻¹
ω = 24π km\min
therefore, the linear speed in km/hr is, 24π
Your uestion is incomplete most probably your full question was
A drive has a maximum speed of 10.000 revolutions per minute. if a disc has a diameter of 14 cm, what is the linear speed, in km/h of a point 5 cm from the center of the disc is spinning at a rate of 4000 revolutions per minute
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Use the motion map to answer the question. A motion map. The position line is a long black arrow pointing right, labeled x. Above the line are 2 dots with a vector pointing away from x that start at x, each one shorter. Above that are two yellow vectors pointing toward x, each positioned to the left of a dot. A vertical row of 3 black dots appear in the center of the position line, where the bottom dot is aligned with the yellow arrows and the top dot has a vector pointing away from the origin. There is one other dot with a longer vector arrow to the right of the top dot. Above this line are 2 yellow arrows pointing away from the origin. Which scenario could be represented by the motion map
The motion map could represent a situation in which a car is accelerating to the right, then slowing down, and then speeding up again.
What is the motion ?
Motion is the action or process of moving or being moved from one place to another. It is a fundamental concept in physics that describes a change in position over time. Motion can be explained with the use of Newton's laws of motion and can be mathematically described by equations of motion. Motion can be observed in everyday life, such as the motion of a car, a ball falling to the ground, and the motion of a pendulum. Motion is an integral part of many scientific fields, including physics, chemistry, astronomy, and mathematics. Motion can also be studied in art, literature, and music.
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drag the labels onto the diagram to identify the components of replicating dna strands. A.Parental DNA
B. DNA polymerase
C. Leading strand
D. Lagging Strand
E. DNA ligase
F. Replication Fork
A DNA fork is a structure that forms during DNA replication. The double helix structure of DNA needs to be unwound in order for replication to occur. The labeled diagram is attached below.
What is a replication fork?This unwinding takes place at a specific point on the DNA molecule called the replication fork. The replication fork is formed by the separation of the two complementary strands of the DNA double helix, and it acts as a template for the synthesis of new DNA strands. The replication fork is maintained by enzymes called helicases, which unwind the DNA, and primases, which add short RNA primers to the template strands. The process of replication continues as the two strands of DNA are separated and new nucleotides are added to each strand by DNA polymerase.
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The complete question is as follows:
for each of the situations given, state whether frictional forces do positive, negative, or zero work on the italicized object. hint (a) a plate slides across a table and is brought to rest by friction. positive negative zero (b) a person pushes a chair at constant speed across a rough, horizontal surface. positive negative zero (c) a box is set down on a stationary conveyor belt. the conveyor belt is then turned on and the box begins to move, being carried along by the belt. positive negative zero (d) a person exerts a horizontal force on a banana at rest on a counter top. the banana remains at rest. positive negative zero
Concept: If the (frictional) force and the displacement are the same, then the work will be positive and (a) and (b) have negative values. (c)has positive (d) has zero.
What does physics mean by displacement?An object's directional movement if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a lecturer moves to the right in relation to a whiteboard. Displacement describes this shift in location.
Can there be zero displacement?A body that goes a distance and then returns to its initial location has the same starting and ending points. In this case, the displacement is 0 but the distance covered is not. It is possible to have positive, negative, or even zero displacements.
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If the net force applied by the truck ramp in the previous question is -300,000 N, how far along the ramp will the truck move as it stops?
The distance travelled by the truck before coming to a stop is 72.9 m.
What is the acceleration of the truck?
The acceleration of the truck is calculated by applying Newton's second law of motion as follows.
F = ma
a = F / m
where;
F is the net forcem is the massa = ( -300,000 ) / ( 60,000)
a = -5 m/s²
The distance travelled by the truck before coming to a stop is calculated as follows;
v² = u² + 2as
where;
v is the final velocity when the truck stops = 0u is the initial velocity of the trucks is the distance travelled0 = u² + 2as
0 = (27²) + (2)(-5)(s)
= (27²) - 10s
10s = 27²
s = ( 27² ) / 10
s = 72.9 m
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A block of mass m is launched by a spring of negligible mass along a horizontal surface of negligible friction. The spring constant of the spring is k. The spring is initially compressed a distance x₀. The block is released from rest. Some time after the block is released and travels in the direction shown in the figure, the spring compression is [tex]x_f[/tex]. Which of the following mathematical calculations can a student use to determine the speed [tex]v_f[/tex] of the block at this new position?
the spring constant of the spring is k. the spring is initially compressed a distance x0. the block is released from rest.
What is distance and velocity?Velocity is the measure of the amount of distance an object covers in a given amount of time. Here's a word equation that expresses the relationship between distance, velocity and time: Velocity equals distance travelled divided by the time it takes to get there.
Is distance equal to speed?Speed = Distance/Time – This tells us how slow or fast an object moves. It describes the distance travelled divided by the time taken to cover the distance. Time = Distance / Speed, as the speed increases the time taken will decrease and vice versa.
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if the object is pushed a distance d and then pushed back to orgiinal position, what is the work done by frication
The work done by friction is μNd.
what is wotk done?
Work done is the amount of energy transferred by a force to an object when it moves through a distance.
It is calculated by multiplying the force applied to the object by the distance it moves.
Work done is measured in joules (J) and is represented by the equation W = F x d.
Work done by friction = Force x Distance
= Friction coefficient (μ) x Normal Force (N) x Distance (d)
= μNd
Therefore, The work done by friction is μNd.
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n electrostatic paint sprayer has a 0.12 m-diameter metal sphere at a potential of 25.0 kv that repels charged paint droplets onto the object to be painted, which is grounded (electric potential of 0). (a) what charge is on the sphere? recall that for a spherical distribution of charge, the potential is exactly equivalent to the situation where all the charge is concentrated at the center of the sphere.
The charge on the sphere is equal to the product of the potential (25.0 kV) and the capacitance of a sphere (4πε0R).
What is the charge ?
The charge is the amount of money that a person is required to pay for a service or product. It is usually a fee that must be paid to access or use a service or product. In the case of a criminal charge, it is the amount of money that a person is required to pay in order to be released from jail or prison after being charged with a crime. Charges can also be fees charged by a business or organization for a service or product, such as a membership fee.
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