An airplane flies in a loop (a circular path in a vertical plane) of radius 160 m . The pilot's head always points toward the ce
nter of the loop. The speed of the airplane is not constant; the airplane goes slowest at the top of the loop and fastest at the bottom (a) At the top of the loop, the pilot feels weightless. What is the speed of the airplane at this point?
(b) At the bottom of the loop, the speed of the airplane is 300. What is the apparent weight of the pilot at this point? His true weight is 760 .
The Sun's energy gets to the Earth through radiation, which you can prove just by standing outside and letting the sun's rays warm your face on a sunny day. Every object around you is continually radiating unless its temperature is at absolute zero, at which point its molecules completely stop moving.
