microwaves are so quick and efficient because they channel heat energy directly to the molecules (tiny particles) inside food. microwaves heat food like the sun heats your face—by radiation.
recall the equation for the potential energy stored in a spring:
pe = 0.5kx²
pe is the potential energy.
k is the spring constant.
x is the length by which the spring is extended/compressed.
pe = 0.053 j
x = 2.6 cm = 0.026 m
substitute the terms in the equation with the given values and solve for k:
0.053 = 0.5×k×0.026²k = 156.8 n/m
light travels from crown glass (n=1: 52) into air (n=1.00). the angle of refraction in