Two friends are carrying a 200-kg crate up a flight of stairs. the crate is 1.25 m long and 0.500 m high, and its center of gravity is at its center. the stairs make a 45.0° angle with respect to the floor. the crate also is carried at a 45.0° angle, so that its bottom side is parallel to the slope of the stairs (fig. 2). if the force each person applies is vertical, what is the magnitude of each of these forces?

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

Newtons view of arrangement of the universe. don't copy from anywhere.

A51 kg woman skis down a hill and her kinetic energy is 9.96e4 j. what is her speed?