|
Formula Review for Chapter 13 -- With Solutions |
||||
|
pg |
Formula |
Units |
Word Problem |
Solution |
|
432 |
Work W = F * D |
Joules |
1) A crane uses an average force of 5,200 N to lift a girder 25 m. How much work does the crane do on the girder? | |
|
433 |
Power Power = W / T |
watts |
2) Ann walks up the stairs on her way to class. She weighs 565 N and the stairs go up 3.25 m vertically. If she climbs the stairs in 12.6 seconds, what is her power output? | |
|
446 |
Potential PE = m * g * h |
Joules |
3) What is the gravitational potential energy of a 0.52 kg bird flying at an altitude of 550 m?
|
|
|
463 |
Kinetic KE = 1/2 m* v2 |
Joules |
4)What is the kinetic energy of a 0.45 kg ball traveling at 2 m/s?
|
|
|
459 |
Efficiency Eff = WO / WI |
% |
5) Alice and Jim calculate that they must do 1500 J of work to push a desk up a ramp. They actually use 2500 J of work. What is the efficiency of the ramp? |
|
|
(lab) |
Acceleration A = 2D / T 2 |
m/s/s |
6) A ball bearing drops from 2 meters to the ground in 0.6388 seconds. What is its acceleration? | |
|
(lab) |
Velocity V = D / T |
m/s |
7) A ball rolls across the floor for 5 meters in 3 seconds. What is its velocity? | |