# 3 physics problems!? CHALLENGE?

Question by mathstinks: 3 physics problems!? CHALLENGE?
1. to simulate the apparent weightlessness of space orbit, astronauts are trained in the hold of a cargo aircraft that is accelerating downward at g. Why will they appear to be weightless as measured by standing on a bathroom scale, in this accelerated frame of referenc? is there any diff between their apparent weightlessness in orbit and in the aircraft?
2. a cartoon shows the toupee coming off the head of an elevator passenger when the elevator rapidly stops an upward ride. can this really happen without the person being tied to the floor of the elevator? explain.
3. calculate the maximum acceleration of a car that is heading up a 4 degree slope (with the horizontal) under the road condition of rubber on dry concrete (mu = 1) assume that only half the weight of the car is supported by the two drive wheels and that the static coefficient of friction (1) is involved (tires aren’t allowed to slip during acceleration)