A 71.80 kg person holding a steel ball stands motionless on a frozen lake. The person then throws the ball, which propels the person at 0.15 m/s to the
right and the ball 3.50 m/s to the left. If the initial momentum of the system is
zero, what is the mass of the steel ball?
A. 3.08 kg
B. 3.50 kg
O C. 20.51 kg
O D. 23.33 kg

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

If element x has 99 protons how many electrons does it have

Select light for the type of wave, adjust the wavelength so that the light is red, and increase the amplitude of the light to the max. then, select the start button at the source location to begin producing the waves. light is a form of electromagnetic wave, containing oscillating electric and magnetic fields. the wave amplitude detector mentioned above shows how the electric field oscillates in time at the location of the probe. the amplitude of the wave at the location of the probe is equal to the maximum electric field measured. how does the amplitude of the wave depend on the distance from the source?