What is latent heat of vaporization? A. The amount of energy required to raise the temperature of 1 kg of
a substance 1°C.
B. The amount of energy required for a unit mass of a substance to
undergo a phase change from a liquid to a gas,
C. The amount of energy required for a unit mass of a substance to
undergo a phase change from solid to liquid,
D. A physical change from one form (or phase) of matter to another.

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.