Heat transport from sun to earth is accomplished primarily by

Radiation

Explanation:

Radiation is the transfer of heat from one material to another without a material medium or through a vacuum.

The heat from the sun gets transmitted to the earth through space through radiation of heat energy from the sun. This heat energy is transported as electromagnetic radiation.

Since there is no material medium between the earth and the sun, the earth primarily receives this heat through radiation.

Explanation:

Given data

The elevator mass=3.0×10³ kg

Time t=23 s

elevator lift d=210 m

The power is the average rate of work done:

So

P=F.V Cosα

Where F is force

V is velocity

α is angle between Force and velocity

Apply the Newton Law to find the force on elevator

The velocity of elevator is given as

Since the net force has same direction of motion so α=0°

So