A block weighing 50.0 newtons is on a ramp inclined at 45.0° to the horizontal. A 20.0-newton force of friction, F1, acts on the block as it is pulled up the ramp at constant velocity v with a force F2 that is parallel to the ramp, as shown in the diagram below. What is the magnitude of force F2?

A. 49.5 N
B. 55.4 N
C. 367 N
D. 486 N

Identify the type of synthetic material used in each object

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

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island