What is the approximate weight of a 20-kg cannonball on earth?
a. 2 n
b. 20 n
c. 200 n
d. 2000 n?

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Ms.hidalgo opens the door to her classroom. her classroom is 60 degrees and the air outside is 80. predict what will happen using your knowledge of how heat flows.