The answer is D. time really does pass more slowly in a rest frame of reference relative to a frame of reference that is moving
Wave speed = (frequency) x (wavelength)
= (5 / second) x (30 mm)
= 150 mm/second = 0.15 meter/second .
The work done is the loss of kinetic energy.
Loss of kinetic energy = m*(v1^2 - v2^2)/2 = 10 kg * [ (99m/s)^2 - (1m/s)^2]/2 = 49,000 J
The two largest natural cycles where convection currents occur are :
the movement of air in the atmosphere and
the movement of magma in the earth's mantle.
