What is the acceleration of this object? the object's mass is 2 kg. small box with dot in the middle. arrows originate at dot. arrow up and arrow down are same length. arrow up labeled f sub norm equals 20 n and arrow down labeled f sub grav equals 20 n. arrow to the right is longer than arrow to the left. arrow to the right is labeled f sub app equals 22 n and arrow to the left is labeled f sub frict equals 14 n. 11 m/s2 0 m/s2 4 m/s2 7 m/s2

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

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow