Question C1 A 110 kg merry-go-round with radius of 0.85 m was accelerated from rest to 12 rad/s in 10 s when you applied a constant torque of 304
Nm on it. Right after it reached 12 rad/s, you immediately jumped on the edge of the merry-go-round platform which is 0.85 m away from
the axis of rotation.
By assuming the friction is the same before and after the jump, calculate
(a) the friction of the merry-go-round
(b) the angular velocity of the merry-go-round the moment you jumped on it. Assume you have a mass of 69.7 kg.
(c) the duration taken for the whole system to come to rest, from the moment you jumped on the merry-go-round.
Question,

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

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

Two vectors are shown. which statement best compares the vectors? vector x has greater magnitude than vector y. vector y has greater magnitude than vector x. the vectors have the same displacement. the vectors have the same direction.