A ball is falling toward the ground. Which is true? a. The net force acting on it is downward.
b. The net force acting on it is upward.
c. The net force is zero.
d. All forces can add up to any number. We don't have enough information.

Rank the torques on the five doors shown in the figure above from least to greatest. note that the magnitude of all the forces is the same

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?

If we relied solely on the nonrenewable resources found in the u. s., which one would we run out of first at current usage levels? a. natural gas b. oil c. uranium d. coal