Particle moves form extreme position to mean positions, its (a) Kinetic energy decrease, potential energy decreases (b) Kinetic energy decrease, potential increases tod g nsupe (c) Both remains constant (d) Potential energy becomes zero and kinetic energy remains constant
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- A ball is thrown upward in the air. Neglect air resistance. As it travels upward, a) Both its kinetic energy and potential energy increase. b) Its kinetic energy increases and potential energy decreases. c) Its kinetic energy decreases and potential energy increases. d) Both its kinetic energy and potential energy decreases.How much work (in Joules) is done by a 32N force acting over a distance of 8m? Assume the force is in the same direction as the displacement.69. An external force moves a 3.50-kg box at a constant speed up a frictionless ramp (Figure 6-46). The force acts in a direction parallel to the ramp. (a) Calculate the work done on the box by this force as it is pushed up the 5.00-m ramp to a height of 3.00 m. (b) Compare the value with the change in gravitational potential energy that the box undergoes as it rises to its final height. Example 6-10 5.00 m F V 3.50 kg Figure 6-46 Problem 69 T 3.00 m
- When a 12 kg object increases its potential energy by 720 J, approximately how has its position changed? a) It has risen vertically 60m b) It has fallen vertically 6m c) It has risen vertically 6m d) It has fallen vertically 60m2. Nicole lifts a bowling ball with a mass of 6.2 kg to a height of 1.5 meters above the floor. (a) How much work does she do to lift it? [be careful! E-S-AJ (b) How much gravitational potential energy (GPE) does the ball now have relative to the floor? (E-S-AJ (c) Work put into lifting an object to a given height is (greater than, less than, equal to) the GPE of the object as it rests at that height. (d) How much kinetic energy (KE) does the ball have as she holds it at rest at this height? while increasing in (height. (e) If she drops the ball, the ball will decrease in (height, speed) This indicates a transference of (KE, GPE) to (KE, GPE) speed)A cyclist starts from rest and coasts down a 4.0∘ hill. The mass of the cyclist plus bicycle is 85 kg. Ignore air resistance and friction. - After the cyclist has traveled 130 m, what was the net work done by gravity on the cyclist? - How fast is the cyclist going?