Which best describes the relationship between internal energy and thermal energy?
thermal energy is a measure of the internal energy of a substance.
internal energy is a measure of the thermal energy of a substance.
internal energy is the portion of thermal energy that can be transferred.
thermal energy is the portion of internal energy that can be transferred.

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft