Question 4 of 32 A bungee jumper who is about to jump has her energy stored entirely as
gravitational potential energy. After jumping, she bounces up and down. What
has happened to her initial gravitational potential energy when she reaches
equilibrium - that is, when she stops bouncing up and down?
O A. Some of her initial energy has been transferred to potential energy
in the bungee cord.
B. Friction and air resistance have converted all of her initial energy
to heat and sound.
C. She has regained all of her initial energy as gravitational potential
energy
D. The different energy types (gravitational potential, kinetic, and
spring potential) have balanced.
SUBMIT

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.

The lights used by mark watley (played by matt damon) during the film the martian seem to be metal halide lamps. metal halide lamps are filled with vaporized mercury and metal-halogen compounds. when an electric current is passed through the lamp, the tube begins to glow a bright white/blue color. if you were to pass this light through a prism to separate the individual light frequencies, you would see a rainbow just as you would if using natural sunlight because of the complexity of the metal halide gas and the vast amount of possible electron transitions. (the study of light in this way is known as spectroscopy and allows astronomers to know exactly what atoms compose distant stars, simply by looking at the light they emit. the spectral lines an atom produces uniquely identifies that atom just like a fingerprint uniquely identifies a person. the momentum equation and energy equation that we have used above can be combined to give the following equation: c = e p where again p is the phonon momentum, e is the photon energy and c is the speed of light. when you divide the photon energy found in #6 by the photon momentum found in #4, do you get the speed of light? (if not, check your work for questions #4 through #6). yes no