#1) In rotational dynamics, moment of inertia plays a role analogous to one of t

Question

#1) In rotational dynamics, moment of inertia plays a role analogous to one of the quantities encountered in linear motion namely:

a) Momentum

b) Mass

c) Torque

d) Impulse

#3) The reason an astronaut in an earth satellite feels weightless is that:

a) The astronaut is beyond the range of earth’s gravity

b) The astronaut is falling

c) The astronaut is at a point in space where the effects of the moon’s gravity and the earth’s gravity cancel

d) The astronaut’s acceleration is zero

#4) A 50-cm^3 block of wood is floating partially submerged in water, and a 50-cm^3 block of iron is totally submerged in water. Which block has the greater buoyant force on it?

a)The wood

b) The iron

c) Both have the same buoyant force

d) The answer cannot be determined without knowing the densities of the blocks

#5) Planet Z-34 has a mass equal to 1/3 that of Earth, a radius equal to 1/3 that of Earth, and an axial spin rate ½ that of Earth. With g representing, as usual, the acceleration due to gravity on the surface of Earth, the acceleration due to gravity on the surface of C-34 is

a) g/3

b) 3g

c) 6g

d) g/9

e) 9g

Explanation / Answer

1. like mass is used in translational motion.

in rotational , equivalent is moment of inertia.

Ans(b) mass

3. (B) the astronaut is falling.

4. Fb = submerged volume x density of water x g

submerged volume is greater for iron. so have greater buoyant force.

Ans(B)

5. g = G M / R^2

g' = G (M / 3) / (R/3)^2 = 3 (G M / R^2) = 3 g

Ans(b)

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