Pretest: Unit 3 Question 8 of 32
When you drop a penny off the roof of a building, it takes 16 seconds to reach
the ground. How high is the roof?
A. 980.9 m
B. 1254.4 m
C. 1073.0 m
D. 1580.6 m

Aferris wheel is a vertical, circular amusement ride with radius 9 m. riders sit on seats that swivel to remain horizontal. the ferris wheel rotates at a constant rate, going around once in 9 s. consider a rider whose mass is 56 kg. at the bottom of the ride, what is the perpendicular component of the rate of change of the rider's momentum? at the bottom of the ride, what is the vector force exerted by the seat on the rider?

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.