A bullet fired into a trunk of a tree loses 1/4 of its kinetic energy in traveling a distance of 5 cm. Assuming constant retardation before stopping, it travels a further distance of: A 150 cm B 1.5 cm C 1.25 cm D 15 cm

A 58-kg pole vaulter running at 10 m/s vaults over the bar. Her speed when she is above the bar is 1.4 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar. ____m

A 98 kg bicyclist traveling 15 m/s coasts up a 5 m high incline. After reaching the top of the incline, their speed has been reduced to 2 m/s. How much thermal energy from friction was lost between the two points given?

An object is dropped from a height of 50 m with zero initial velocity. Assuming 5% of the energy is lost to drag, what's the speed of the object when it hits the ground? A 19.4m/s (B) 9.8m/s © 47.5m/s (D 30.5 m/s

Starting from rest, a horse pulls a 241-kg cart for a distance of 1.50 km. It reaches a speed of 0.380 m/s by the time it has walked 50.0 m and then walks at constant speed. The frictional force on the rolling cart is a constant 291 N. Each gram of oats the horse eats releases 9.00 kJ of energy; 10.0% of this energy can go into the work the horse must do to pull the cart. How many grams of oats must the horse eat to pull the cart?

A 0.59-kg particle has a speed of 5.0 m/s at point A and kinetic energy of 8.5 J at point B. (a) What is its kinetic energy at A? J(b) What is its speed at point B? m/s(c) What is the total work done on the particle as it moves from A to B? J

A roller coaster of mass 500 kg is at its highest point in a loop traveling at a velocity of 4 m/s. The loop is 15 meters tall. Assuming 5 kJ of energy is lost between the highest and lowest point of the loop, how fast is the roller coaster traveling when it reaches the lowest point of the loop? 15.3 m/s 28 m/s O None 17.2 m/s

A CHEB hours, 58 minutes, 34 seconds. mpletion Status: QUESTION 12 Two objects interact with each other and with no other objects. Initially object A has a speed of 5 m/s and object B has a speed of 10 m/s. In the course of their motion they return to their initial positions. Then A has a speed of 4 m/s and B has a speed of 7 m/s. We can conclude: O A. mechanical energy was decreased by conservative forces OB. mechanical energy was increased by conservative forces OC. mechanical energy was decreased by nonconservative forces O D. mechanical energy was increased by nonconservative forces O E. the potential energy increased from the beginning to the end of the trip RENG RANG B one level to a higher level after passing through an intermediate valley. The track is in a distance d. The block's initial speed is vo = 5.4 m/s, the height differen

As usual, Hampus is out cycling. He is driving at 30.0 km/ h when he comes to a small hill that is 11 m high and 350 m long. Hampus and the bike weigh 95 kg together. a) What kinetic energy does Hampus have just before the hill? b) How much extra energy must Hampus produce to maintain a constant speed (30.0 km/ h) throughout the hill? c) How long does it take him to drive up the hill? d) What effect must he develop on the hill? Once at the top of the hill, the ground is flat. Hampus is tired and stops pedaling. After 12s the cycle stops. e) How big is the coefficient of friction? You can assume that is constant throughout the deceleration and that it includes both drag and rolling resistance.

A shooting star is a meteoroid that burns up when it reaches Earth’s atmosphere. Many of these meteoroids are quite small. Compare the kinetic energy of a shooting star to that of a moving car. (a) What is the kinetic energy of a meteoroid of mass 4.84 g moving at a speed of 49.2 km/s? (b) What is the kinetic energy of a 1054-kg car moving at 28.9 m/s (64.6 mi/h)?