Physics True False: Answers Explained

[firyjade12]

Determine whether each statement below is true or false.

The sweet spot on a tennis racket is the place where the ball produces maximum vibrations in the racket.
As an airplane gains altitude at a constant speed, its KE increases.
The ratio of output work to input work is called mechanical advantage.
Most electrical power in the U.S. comes from nuclear power.
The ratio of force output to force input is called efficiency.
Machines are devices that multiply or redirect forces.

The Attempt at a Solution

1st
False
False
True
False
True
True

2nd

False
False
False
False
True
True

4 Incorrect. (Try 3)
False
False
True
False
False
True
5 Incorrect. (Try 4)
True
False
True
False
False
True
6 Incorrect. (Try 5)
True
False
True
False
True
True
8 Incorrect. (Try 6)
True
False
True
True
False
True
10 Incorrect. (Try 7)
True
True
True
False
False
True
11 Incorrect. (Try 8)
False
False
False
True
False
True
12 Incorrect. (Try 9)
False
False
False
False
True
False

 

[PhanthomJay]

It might take you a few more days to get all the answers correct if you do it this way, and you will have learned nothing at that time. Most of the answers can be found by surfing the net, and then reading and understanding why. Regarding nuclear power in the US, however, I'll tell you that a new nuke plant has not been built in this country in the past 20 years or so.