Answer True, False, or Cannot tell to each of the five statements below. E.g., i

Question

Answer True, False, or Cannot tell to each of the five statements below. E.g., if the answer to the first statement is true' and to the rest, cannot tel', enter a. You pour 100 g of salt onto a spring scale in an elevator accelerating upward. The b. A 2 kg and a 3 kg ball are dropped from a tower. The net forces on each are the c. An astronaut stands on a bathroom scale on the surface of Jupiter; the scale does not d. Mass and weight describe the same thing, although in different units. scale reads a value greater than 100 g. same. read the astronaut's true weight. e. You are standing on a jet-powered platform that can move straight up or down. Your apparent weight is greater than your true weight if the platform is ascending and speeding up.

Explanation / Answer

a. True

Suppose lift is stationary. On the body: tension acts upwards and weight acts downwards. Body is stationary. Hence T = mg

Now, the lift moves up with acceleration a.

There is a net force on the body that makes it move up with acceleration.

T - mg = ma

Hence T = mg + ma.

Hence, the weight of body as measured by spring balance increases.

b. False

c. True

d. True

e. True

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