Planet X has 4 times the mass of Earth but the same radius. What is the strength of the gravitational field on its surface?
(1) 4g
(2) 16g
(3) 1/4g
(4) 1/16g

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =

Distinguish between linear momentum and angular momentum