A tow truck pulls a car 5.00 km along a horizontal roadway using a cable having a tension of 850 N. (a) How much work does the cable do on the car if it pulls horizontally? If it pulls at 35.0° above the horizontal? (b) How much work does the cable do on the tow truck in both cases of nart (a)? (c) How much work does gravity do on the car in part (a)?
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- A crate of mass 10.0 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline, which makes an angle of 20.0◦ with the horizontal. The coefficient of kinetic friction is 0.400, and the crate is pulled 5.00 m. (a) How much work is done by gravity? (2pts) (b) How much work is done by the 100 N force?(A)T0m (B)5m HA person is dragging a 20kg box along the ground by a rope 30° to the horizontal with a force of 100N, at a constant velocity. What is the coefficient of friction? (A)0.58 (B)0.43 (C)0.34 (D)0.16 18) When the kinetic energy of a body changes with time, what does this change represent? (A)The work done by some force. (C)The work done by some average force. (B)The work done by a net force. (D)The work done by an irregular force. 19) A mass m has a velocity v at a position X, what will be the work done if the distance traveled is quadrupled? (A) ½ mv² (B)mv2 (C)3/2 mv? (D)2mv? 20) Which of the following statements is true about the relationship between the scalar product of two vectors and the product of the magnitudes of the vectors? (A) F•řis larger than Fr. (B) F•ř is smaller than Fr. (C) F•ř could be larger or smaller than Fr, depending on the angle between the vectors. (D) F•ř could be equal to Fr.A force given by (6i – 3j) N acts on an object experiencing a displacement given by (3i – j) m. Determine the work done by the force.
- Starting from rest, a 4.70-kg block slides 3.40 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is = 0.436. (a) Determine the work done by the force of gravity. (b) Determine the work done by the friction force between block and incline. (c) Determine the work done by the normal force. (d) Qualitatively, how would the answers change if a shorter ramp at a steeper angle were used to span the same vertical height?Starting from rest, a 5.50-kg block slides 2.30 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is k (a) Determine the work done by the force of gravity. J (b) Determine the work done by the friction force between block and incline. J (c) Determine the work done by the normal force. (d) Qualitatively, how would the answers change if a shorter ramp at a steeper angle were used to span the same vertical height? 0.436.A force of constant magnitude pushes a box up a vertical surface as shown in the figure. The box moves at a constant speed. If the mass of the box is 3.70 kg, it is pushed 3.60 m vertically upward, the coefficient of friction is 0.350 and the angle ? is 30.0°, determine the following. (a) work done on the box by F J(b) work done on the box by the force of gravity J(c) work done on the box by the normal force J(d) increase in gravitational potential energy of the box as it moves up the wall J
- You drop a 1.50 kg book to a friend who stands on the ground at distance D= 12.0 m below. If your friend's outstretched hands are at distance d = 1.30 mabove the ground (see the figure), (a) how much work W, does the gravitational force do on the book as it drops to her hands? (b) What is the change AU in the gravitational potential energy of the book-Earth system during the drop? If the gravitational potential energy Uof that system is taken to be zero at ground level, what is U (c) when the book is released and (d) when it reaches her hands? Now take U to be 100 J at ground level and again find (e) W, (f)AU. (g) U at the release point, and (h) U at her hands. (a) Number Units (b) Number Units (c) Number Units (d) Number Units (e) Number Units (f) Number Units (g) Number Units (h) Number Units >A 4.5-kg block slides down a frictionless incline making an angle of 55.0° with the horizontal. (a) What is the total work done on the block when the block slides 1.4 m (measured along the incline)? (b) What is the speed of the block after it has slid 1.2 m if it starts from rest? m/s (c) What is its speed after 1.2 m if it starts with an initial speed of 1.6 m/s? m/s You can use the definition of work as the scalar product of a constant force and displacement to find the work done by each force acting on the block. Then use the work- kinetic energy theorem the find the speed of the block at any given location and for any initial kinetic energy it may have.A cat's crinkle ball toy of mass 28 g is thrown straight up with an initial speed of 5 m/s. Assume in this problem that air drag is negligible. (a) What is the kinetic energy of the ball (in J) as it leaves the hand? (b) How much work is done (in J) by the gravitational force during the ball's rise to its peak? (c) What is the change in the gravitational potential energy of the ball (in J) during the rise to its peak? (d) If the gravitational potential energy is taken to be zero at the point where it leaves your hand, what is the gravitational potential energy (in J) when it reaches the maximum height? (e) If the gravitational potential energy is taken to be zero at the maximum height the ball reaches, what would the gravitational potential energy (in J) be when it leaves the hand? (f) What is the maximum height the ball reaches (in m)? m
- An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 5.3x 104 kg, and the force causes its speed to change from 6900 to 5500m/s. (a) What is the work done by the force? (b) If the asteroid slows down over a distance of 2.3x 10 m determine the magnitude of the force. (a) Work- (b) F- iA rope is tied to a box and used to pull the box 1.5 m along a horizontal floor. The rope makes an angle of 30° with the horizontal and has a tension of 5 N. The opposing friction force between the box and the floor is 1 N. How much work does each of the following forces do on the box: (a) gravity, (b) the tension in the rope, (c) friction, and (d) the normal force? What is the total work done on the box?Starting from rest, a 5.70-kg block slides 2.80 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is u, = 0.436. (a) Determine the work done by the force of gravity. (b) Determine the work done by the friction force between block and incline. (c) Determine the work done by the normal force. (d) Qualitatively, how would the answers change if a shorter ramp at a steeper angle were used to span the same vertical height?