Posted by **Isis** on Wednesday, January 30, 2013 at 6:12pm.

1.) A 500 kg roller coaster is pulled to the top of a hill 45 m high and arrives at the top with a zero speed.

a) how much work has done by the vhain to pull the car to the top?

b) how much potential energy does it have at the top?

c)What is the total energy of the system?

d) how much kinetic energy does it have at the bottom?

e) what is the speed at the bottom?

2.) A simple pendelum is 1.5 m long and has 3.0 kg bob attached.

a) how much work was done by the chain to pull the car to the top?

b) how much potential energy does it have to the top?

c) what is the total energy of the system?

d) how much kinetic energy does it have at the bottom?

>> FORMULAS <<

KE= 1/2 v^2 (kinetic energy)

PE=mgh (potential energy)

kg.m/s^2.m

W= Fd (work equals force and distance)

Im sorry I don't know which formula to choose. PLease please please help me!

## Answer this Question

## Related Questions

- Physics - At the beginning of a roller coaster ride, the car is lifted to the ...
- Physics - At the beginning of a roller coaster ride, the car is lifted to the ...
- Physics - At the beginning of a roller coaster ride, the car is lifted to the ...
- physics - At the top of a hill, a roller coaster has 67,500 J of kinetic energy ...
- Physics - Analyzing Roller Coaster Performance Using Conservation of Mechanical ...
- Physics - Another question :) At the top of its drop hill, a 1,000 kg roller ...
- Physical Science - What is the Mechanical energy of a 500-kg roller-coaster car ...
- 9th grade -physical science - a the top of a hill a rollercoaster has 67,500j of...
- Physics - A roller coaster works by gravitational energy. The coaster car is ...
- physics - carts of a roller coaster are travelling 5m/s over the top of the ...