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* v^{2} 
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? 