a 650kg roller coaster starts from rest at he top of a 76 meter tall hill.  What is the speed of the coaster at the bottom of the hill?

A 25g ball is released from rest 80m above the surface of the Earth. During the fall the total thermal energy of the ball and air increases by 15J. Just before it his the surface its speed is? O a. 35 m/s O b. 19 m/s O c. 53 m/s O d. 40 m/s O e. 45 m/s

A 20 kg block starts from rest at point A and slides along a frictionless track. What is the speed of the block at point B? A (a) 6.3 m/s (b) 157 m/s (c) 39 m/s (d) 13 m/s 8.0 m в

How do you slove?

ball of mass 1.62 kg is tied to a string of length 2.59 m as shown in figure p6.50. The ball is initially hanging vertically and given an initial velocity of 6.7 m/s in the horizonal direction. The ball then follos a circular arc as determind by the string. what is the initial kinetic energy of the ball? what is the initial potential energy of the ball earth system? assume the height of the ball when it is hanging straight down is zero. what is the potential energy of the ball-earth system when the string makes an angle of 31 degrees with the vertical? what is the speed of the ball when the string makes an angle 31 degrees with the vertical?

A 20 kg child is on a swing that hangs from 3.0-m-long chains, as shown. What is her speed νi at the bottom of the arc if she swings out to a 45° angle before reversing direction?

A 22 kg girl on a swing reaches a height of 2 m above the ground at the top of her motion. What will her speed be at the bottom of the motion where she is 0.5 m above the ground?

Two students climb the ladder up the 25m high light towers at the football field.  Alex weighs 80kg, but can generate {635} W of power. How long does it take Alex to climb to the top? Zeb weighs 90 kg, but can generate 750W.  Does Z make it up to the top faster or slower than A?  Justify your answer with calculations.   While they are up at the top, Zeb finds a 5 kg bowling ball.  How much potential energy does it have? Zeb drops the bowling ball.  Neglect air resistance.  How fast is it moving when it hits the ground? Instead of hitting the ground, it hits a trampoline that compresses by 0.70 meters.  What is the spring constant of the trampoline? Give TWO real world reasons why the bowling ball will not bounce all the way back up to Zeb. Alex finds and drops a 6 kg bowling ball.  Compare the time it takes to hit the ground with the time that Zeb’s ball takes and explain.

A roller coster has a loop with 7.62 diameter. a) What is the minimum height above the bottom of the loop required to acheive enough speed so that the coaster does not loose contact with the track? b) How many g's does the passenger expirience at the top of the loop AND at the bottom of the loop upon entering the loop.? c) suppose the coaster came to rest at 3/4 h on the other side of the loop. What fraction of the energy was lost?

A 59.0 kg skateboarder wants to just make it to the upper edge of a "quarter pipe," a track that is one-quarter of a circle with a radius of 3.20 mWhat speed does he need at the bottom?