a) Find the moment of inertia of a point mass of 0.005 g at a perpendicular distance of 3 m from its axis of rotation. b) Find the moment of inertia of a sphere of mass 0.3 kg and radius 0.6 m. c) Find the kinetic energy of a rotating body with moment of inertia 0.003 kg m² and angular velocity of 0.6 rad s-¹.

A. 4.5 x 10^-5 kg.m2

B. 108 x 10^-3 kg.m2

C. 54 x 10^-5

Explanation:

A. I = m(r^2)

point mass m = 0.005 g = 5 x 10^-6 kg

I = (5 x 10^-6 kg) x (3 m)^2 = (5 x 10^-6 kg) x 9 m^2 = 4.5 x 10^-5 kg.m2

B. I = m(r^2)

point mass m = 0.3 kg = 3 x 10^-1 kg

I = (3 x 10^-1 kg) x (0.6 m)^2 = (3 x 10^-1 kg) x 0.36 m^2 = 108 x 10^-3 kg.m2

C. KE = 1/2I(w^2)

KE = 1/2(3 x 10^-2 kg.m^2)(0.6 rad/s)^2 = 54 x 10^-5

the answer is d. 4

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freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.