2: A cannon fires an 8 kg cannonball into the air. At the highest point in its flight, before coming back down, the cannonball has a horizontal velocity of 35 m/s and is 15 m above the ground.
We can think about the mechanics of the cannon's firing as follows: while the ball was in the 1.5 m
long tube, it experienced an average force due to the explosion of gunpowder. The moment the ball
left the tube, it started to free fall (that is, fly in projectile motion) since this force is no longer
applied. What average force did the cannon's gunpowder explosion apply to the cannonball while it
was in the tube?

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

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

Which best represents the law of conservation of mass ?