FREE POINTS FOR EASY QUESTION An experimenter completes an experiment on which is the best light bulbs to use in a certain type of lamp. He tries 4 different light bulbs in the same lamp. He turns the lamp on with each type of light bulb for the same amount of time.

What is the manipulated variable in this experiment?

the amount of time the lamp is on

the lamp

the light bulbs

the amount of energy used

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

Acar moves at 12m/s and coasts up a hill with a uniform acceleration of -1.6m/s2. how far has it traveled after 6.0s?

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.