### Frictional force doing negative work

Give an example of a frictional force doing negative work. Explain how the friction does work in detail.

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Give an example of a frictional force doing negative work. Explain how the friction does work in detail.

What is the amount of work done by the gravitational force as an object with a mass of 2.00 kg moves up an inclined plane that rises at an angle of elevation of 30 degrees? The question refers to the instant when the object has moved 0.600 m along the surface of the inclined plane in the upward direction. Neglect friction and

A 100 kg object is pulled vertically upwards by a constant force of 4000 N for a distance of 20.0 m. What is the work done by the applied force on the object? 60,400 kg m/s 80,000 kg m/s 80,000 kg m^2/s^2 60,400 kg m^2/s^2

A person lifts a mass of 20.0 kg vertically upwards at a constant speed of 0.200 m/s through a distance of 0.800 m. What is the work done by the person? 16.0 J 156 J 3.20 J None of the other choices is correct. I know that W=M*A*D (Work equals mass times acceleration times distance) and isnt the ac

Suppose we have two blocks composed of 6 harmonic oscillators each and have 3 quanta in each initially. After bringing them together, what is the probability of having all the energy move to one of the blocks?

A television is dropped from the top of a cliff, and 1 second later a second television is thrown downward with a velocity of 20 m/s. How far below the cliff will the second television overtake the first? Could you please show me the detailed work (with the equations) of how to achieve the answer. Our teacher gave us the an

1. Use the work-energy theorem to find the force required to accelerate an electron (m = 9.11 x 10-31 kg) from rest to a speed of 1.50 x 107 m/s in a distance of 0.0125 m. a. 8.20 x 10-15 N b. 5.47 x 10-22 N c. 8.20 x 10-17 N d. 1.64 x 10-14 N e. 3.56 x 10-19 N 2. Use the work-energy theorem to find the force requir

How would I set up a problem that asks for the amount of work performed in pushing back atmosphere in a balloon that has been blown up from a diameter of 6 cm to 16 cm?

Projectile Motion - an easy approach

1. Suppose we have a 2+1 dimensional spacetime described by the line element ds^2 = c^2dt^2 - dx^2 - a(t)^2 dy^2 where a(t) is an increasing function of time. (a) How do you interpret the spatial part of this geometry? In other words, can you describe its shape? (b) Calculate (by hand) the nonzero components of the cur

A pitcher throws a baseball with mass=.145kg straight up with initial v=25 m/s a) How much work has gravity done on the ball when it reaches h=20m above pitcher's hand? b) Using work-energy theorem, calculate speed of baseball at h=20m above pitcher's hand c) Does the answer to part b depend on weather the ball is moving up

A shot-putter puts a shot (weight=0.71 N) that leaves his hand at a distance of 1.52 m above the ground. a.) What is the work done by the gravitational force when the shot has risen to a height of 2.13 m above the ground. d.) What is the change in the gravitational potential energy of the shot.

A 40 kilogram barrel is rolled up a 10 meter ramp to a hieght of 5 meters. A) How much does the barrel weight? b) How much work was done? c) If the person exerted an effort force of 250 newtons to roll the barrel along the ramp, what is the efficiency of the ramp?

A pile is driven into the ground by a hammer of mass (M) 500Kg, dropped from a height of 4 meters. The mass (m) of the pile is 40Kg and the average resistance of the ground to penetration (Fr) is 45 kN. 1) Calculate the Velocity and the kinetic energy of the hammer prior to the impact with the pile. 2) Calculate the velo

An arrow, starting from rest, leaves the bow with a speed of 25.0 m/s. If the average force exreted on the arrow by the bow were doubled, all else remaining the same, with what speed would the arrow leave the bow?

In moving out of a dormitory at the end of the semester, a student does 1.6 x 10^4 J of work. In the process, his internal energy decreases by 4.2 x 10^4 J. Determine each of the following quantities (including the algebraic sign): (a)W, (b) delta U, and (c)Q.

A box is sliding with a speed of 4.50 m/s on a horizontal surface, when at point P, it encounters a rough section. On the rough section, the coefficient of friction is not constant, but starts at 0.100 at P and increases linearly with distance past P, reaching a value of 0.600 at 12.5 m past point P. a) use the work-energy

1 The arm in Figure P8.7 weighs 36.0 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force t in the deltoid muscle and the force s of the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown. 2. One end of a uniform 6.0 m long rod of weigh

(See attached file for full problem description) --- An 82.0 kg-diver stands at the edge of a light 5.00-m diving board, which is supported by two pillars 1.60 m apart. Find the force exerted by pillar B: a. 1.71 kN downwards. b. 1.71 kN upwards. c. 2.51 kN downwards. d. 2.51 kN upwards. A meter stick balan

An insulated system takes in 6.50 kcal of heat and has 2000 J of work done on it. What is the change in internal energy if the system? I believe the answer is 29.2 kJ. I need to see each step and formula to solve this question. Please assume I know nothing because this would be the correct assumption. :)

(a) How many joules are required to raise 1.0 kg of water from room temperature of 22^oC to its boiling point? (b) If this work were used to lift a 50-kg boy instead, how high could he be lifted? I need to see each step and formula to solve this question.

See attached file for full problem description. --- 1. a) A block with a mass m is pulled along a horizontal surface for a distance +x by a constant force F at an angle theta with respect to the horizontal. The coefficient of kinetic friction between block and table is µ. Is the force exerted by friction equal to µmg?

1. Which one of the following statements best explains why it is possible to define an electrostatic potential in a region of space that contains an electrostatic field? a. Work must be done to bring two positive charges closer together b. Like charges repel one another and unlike charges attract one another c. A positive c

A 5.0g bullet if fired horizontally into a 2.0kg wooden block resting on a horizontal surface. The coefficient of kinetic friction between block and surface is 0.20. The bullet remains imbedded in the block, which slides 0.105m along the surface. What was the initial speed of the bullet? (My problem with this is that there is no

A car is travelling on a level road with speed v1 at the instant when the brakes are applied. Assume that the wheels are locked and the car is skidding, so the friction force between the tires and the road is kinetic friction with coefficient mu_k. a) Use the work-energy relation to calculate the minimum stopping distance of

A little red wagon with a mass of 4.60 kg moves in a straight line on a frictionless horizontal surface. It has an initial speed of 10.0m/s and then is pulled 4.0 m by a force with a magnitude of 18.0 N in the direction of the initial velocity. a) Use the work-energy relation to calculate the wagon's final speed. b) Calculate

You and your bicycle have a combined mass of 95 kg. When you reach the base of an overpass, you are travelling along the road at 3.0 m/s. If the vertical height of the overpass is 5.20 m and your speed at the top is 1.5 m/s, how much work have you done in getting to the top? (Ignore friction and any inefficiency in the bike or y

See attached file. Identical charged particles: what is the potential energy in the system; if released, what is the speed of each?

A constant horizontal force of 2.29 N is applied to a 1.82-kg block initially at rest on a friction-free surface. How much work is done on the block in the first 1.35 seconds after the force is applied?

A worker does 300 J of work against a frictional retarding force of 15 N in pushing a power sweeper across a floor in 3.0 Seconds. If the sweeper moves with a constant speed, how fast is it going? I believe the answer is 6.7 m/s. I need to see each step and formula to solve this question.