A 1000 kg car travels around a circular track at a constant speed? A. Dream the free body diagram for the car.

B. If the radius is the path is 290 m and the car is traveling 25 m/s, how long does it take the car to make a lap around the track?

C. What is the net force acting on the car in the horizontal direction?

D. What force is keeping the car in circular path?

E. What is the coefficient of friction between the cars tires and the road?

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

In a system, when potential energy decreases, then entropy also decreases. true false

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is