A. Which statement is a valid description and explanation of the skier's motion based on evidence from the diagram?
The skier's speed decreases going down the hill because forces F1 and F2 are balanced and acting
perpendicular to the direction of the velocity, causing the skier to speed up.
b. The skier's speed increases going down the hill because forces F1 and F2 are balanced and acting
perpendicular to the direction of the velocity, causing the skier to slow down
c. The skier's speed increases going down the hill because forces F3 and F4 are unbalanced, with F3 acting in
the same direction as the velocity, causing the skier to speed up.
d. The skier's speed decreases going down the hill because forces F3 and F4 are unbalanced, with F4 acting in
the opposite direction of the velocity, causing the skier to slow down.

The pressure, volume, and temperature of a mole of an ideal gas are related by the equation pv = 8.31t, where p is measured in kilopascals, v in liters, and t in kelvins. use differentials to find the approximate change in the pressure if the volume increases from 14 l to 14.6 l and the temperature decreases from 375 k to 370 k. (round the answer to two decimal places.)

Comedians like to joke that the reason we haven’t been visited by intelligent life from elsewhere in the universe is that aliens have been monitoring earth’s broadcasts of intellectually embarrassing tv programs, like gilligan’s island, fear factor, the jersey shore, and the jerry springer showand so consider us far too primitive to merit a visit. let’s check the assertion that aliens could have been receiving them. tv programs are broadcast at a frequency of about 100mhz with about 100kw of total power in 30frames per second, which emanatesroughly uniformly in all directions. assume that interstellar space transmits these broadcasts without attenuation. no matter how smart they are, aliens would require at least one photon per frame to interpret our signals. findthe number of photons per unit time per unit area reaching a receiver on a possible planet in the nearest star system, which is about 4 light-years away (a light-year is the distance light travels in a year). if aliens aimed a receiver or detector directly at earth, how big (in diameter) would it have to be to receive a photon per frame

Acar traveling at 22 m/s starts to decelerate steadily. it comes to a complete stop in 15 seconds. what is it’s acceleration?