2atest pilot wcighing 85 kg is strapped into a large centrifuge machine for training the machine
spins rapidly to simulare increased gravitational forces on the body
a the machine spins the pilot in a cirde with a 9.9 m radius, what should be the period of
folation so that the pilot experiences a force equal to twice his body weight? what should be
the period of rotation so that the pilot experiences a force equal to three times his body
weight
b. astationary observer watches as the pilot spins in the machine. from the frame of reference of
the stationary observer, how fast is the pilot traveling as he passes by while experiencing a force
three times that of gravity? give your answer in revolutions per minute, ipm
c. if the radius of the cirde increases but the pilot continues to spin at the same speed, does the
pilot experience more or less force? what can be done to maintain the same force on the pilot?

What is the magnification of a real image if the image is 10.0 cm from a mirror and the object is 50.0 cm from the mirror ? use the equation m=-di/do. a. -5.0 b. 5.0 c. 0.20 d. -0.20

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

Suppose a soccer ball is kicked from the ground at an angle 20.0º above the horizontal at 8.00 m/s. the y-velocity is determined to be 2.74 m/s. how long will the ball be in the air? assume the ball lands at the same height at which it was kicked.