1. A student pushes against a wall with 20 N of force and the wall does not move. In this situation, the
wall exerts -
A.

A.20 N of force in the same direction as the push.
B.20 N of force in the opposite direction of the push.
C. less than 20 N of force.
D. more than 20 N of force.

Which of the following are appropriate acceleration units?

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.