If you have a ball with a mass of 6.00kg, that has an initial velocity of vA=(2.00i + 5.00j)m/s and a final velocity of vB=(-2.00i + 8.00j)m/s, What is the Work done on the ball if the work only changes the kinetic energy?   a. 234 Joules   b. 117 Joules   c. 93 Joules   d. -13 Joules   e. 95 Joules

2. A hand gun fires a 7.50g bullet at a speed of 377m/s. A. Calculate the bullet's kinetic energy. B. At what speed (km/h) must a motorcycle of mass 170kg move to have the same kinetic energy?

A 5.00 gram bullet moving horizontally with a speed of 400 m/s collides with a wooden block. After moving 2.00 cm into the block the bullet stops moving. Was work done on the bullet? If so describe the type of work and the force that did the work.     a. yes, negative work, force is in the opposite direction as the initial velocity of the bullet   b. yes, positive work, force is in the same direction as the initial velocity of the bullet   c. yes, positive work, force is in the opposite direction as the initial velocity of the bullet   d. No work was done on the bullet   e. yes, negative work, force is in the same direction as the initial velocity of the bullet

QUESTION 11 Starting from rest, a ball of mass 3 kg experiences a constant force of 9 N. What is the final kinetic energy (in J) of the ball after it has traveled a distance of 8 m? A. 216J B, 72J C.3J D. 24J E, 27J

How much work is done when a 4kg block of ice is moved from rest to a speed of 5m/s?   A. 50 J   B. 100 J   C. 20 J   D. 10 J

Mountain climbers carry bottled oxygen when at very high altitudes, since the atmosphere contains less and less as you go higher up. a. Assuming that a mountain climber uses 3.92 liters of oxygen per minute, calculate how many liters of oxygen a climber would need for 11 h of climbing. (These are liters at sea level.) Note that only 40% of the inhaled oxygen is utilized; the rest is exhaled.  b.  How much useful work does the climber do, in joules, if he and his equipment have a mass of 97.5 kg and he gains 1150 m of altitude?  c. What is his efficiency for the 11-h climb? Assume his total energy consumption is 1370 W.

A basketball of 0.400 kg is drop of a height of 5.00 m to the ground and bounce back to a height of 3.00 m a. On its way down,how much potential energy does the ball lose? b. On its way back,how much potential energy does the ball regain?

You take a 13kg bag of lead pellets and drop it from 2m above the ground.a. How much gravitational potential energy does the bag have when held 2m above the ground?b. The bag is dropped. Just before it hits the ground, how much kinetic energy does it have?c. How fast is the bag moving just before it hits the ground?d. When it hits the ground, the kinetic energy will be transformed mostly into thermal energy. If 40%of this energy goes into the lead pellets as heat, what will be the increase in temperature of thelead? Assume led has a specific heat capacity of 160J/kg·K.

How much work (in J) must be done to lift a stack of bricks, which has a mass of 50 kg, from the ground to a height of 6 m? (g = 10 m/s?) A. 300J B. 500 J C. 3,000) D. 5,000J E. zero J

42. A 2.0 g bullet initially moving with a velocity of 87 m/s passes through a block of wood. On exiting the block of wood, the bullet's velocity is 12 m/s. How much work did the force of friction do on the bullet as it passed through the wood? If the wood block force was 4.0 cm thick, what was the average that the wood exerted on the block?