Author Question: An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in ... (Read 68 times)

wrbasek0 · **on:** Jul 29, 2018

An athlete doing push-ups performs 650 kJ of work and loses 425 kJ of heat. What is the change in the internal (thermal) energy of the athlete?

A) -225 kJ
B) -1075 kJ
C) 1075 kJ
D) 225 kJ
E) 276 kJ

Question 2

A photon scatters off of a stationary electron. Which of the following statements about the photon are true? (There could be more than one correct choice.)

A) Its wavelength increases due to the scattering.
B) Its frequency increases due to the scattering.
C) Its wavelength decreases due to the scattering.
D) Its frequency decreases due to the scattering.
E) Its energy does not change.