Chapter 5: Q20. (page 131)
People sometimes ask, "What keeps a satellite up in its orbit around the Earth?" How would you respond?
The satellite remains in the orbit due to its speed and centripetal force.
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Estimate the acceleration due to gravity at the surface of Europa (one of the moons of Jupiter) given that its mass isand making the assumption that its mass per unit volume is the same as Earth’s.
A car maintains a constant speed v as it traverses the hill and valley shown in Fig. 5–34. Both the hill and valley have a radius of curvature R. At which point, A, B, or C, is the normal force acting on the car (a) the largest, (b) the smallest? Explain. (c) Where would the driver feel heaviest and (d) lightest? Explain. (e) How fast can the car go without losing contact with the road at A?
A girl is whirling a ball on a string around her head in a horizontal plane. She wants to let go at precisely the right time so that the ball will hit a target on the other side of the yard. When should she let go of the string?
The Moon does not crash into the Earth because:
(a) the net force on it is zero.
(b) it is beyond the main pull of the Earth's gravity.
(c) it is being pulled by the Sun as well as by the Earth.
(d) it is freely falling but it has a high tangential velocity.
Why do airplanes bank when they turn? How would you compute the banking angle given the airspeed and radius of the turn? [Hint: Assume an aerodynamic "lift" force acts perpendicular to the wings. See also Example 5 -7.]
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