Exam 10: Energy and Work

Calculate the kinetic energy of a 0.300 kg baseball thrown at a velocity of 44 m/s.

A horizontal spring-mass system oscillates on a frictionless table.If the ratio of the mass to the spring constant is 0.038 kg · m/N,and the maximum speed of the mass was measured to be 17.60 m/s,find the maximum extension of the spring.

A spring stretches by 21.0 cm when a 135 N object is attached.What is the weight of a fish that would stretch the spring by 31.0 cm?

If one lifts a box and walks up a couple of floors,how would the change in potential energy be accounted for?

A block slides down a frictionless inclined ramp.If the ramp angle is 17.0° and the length of it is 30.0 m,find the speed of the block as it reaches the end of the ramp,assuming it started sliding from rest at the top.

A person stands on the edge of a cliff.She throws three identical rocks with the same speed.Rock X is thrown vertically upward,rock Y is thrown horizontally,and rock Z is thrown vertically downward.Assuming the elevation loss of the three rocks is the same (the base of the cliff is flat),which rock hits the ground with the highest speed?

Describe the energy transfers that take place as you use a slingshot to shoot a rock into the air,it rises to a peak,then falls,and finally hits the ground and stops without bouncing.

Is energy conserved during a two-car collision?

A ball can be rolled down one of four different ramps,as shown below.The final elevation loss of each of the ramps is the same.Neglecting friction,for which ramp will the speed of the ball be the highest at the bottom?

Two cyclists,who weigh the same and have identical bicycles,ride up the same mountain,both starting at the same time.Joe rides straight up the mountain,and Bob rides up the longer road that has a lower grade.Joe gets to the top before Bob.Which statement is true?