Someone hits a tether ball to make it spin around a pole. The cord that attaches the tether ball to the central pole then winds around the pole. What happens to the angular speed of the tether ball during this process?
1.It decreases.
2.It increases.
3.It remains constant.
4.It cannot be determined.
2
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A 50-kg satellite circles the Earth in an orbit with a period of 120 min. What minimum energy is required to change the orbit to another circular orbit with a period of 180 min? (Earth: radius = 6.4 × 10^6 m, mass = 6.0 × 10^24 kg)
a. 2.9 × 10^8 J b. 3.5 × 10^8 J c. 4.1 × 10^8 J d. 4.7 × 10^8 J e. 5.9 × 10^8 J
A 0.500 kg stone is moving in a vertical circular path attached to a string that is 75.0 cm long. The stone is moving around the path at a constant frequency of 2.20 rev/sec. At the moment the stone is overhead, the stone is released. The magnitude and direction of the velocity of the stone when it leaves the circular path is
A. 10.4 m/s horizontal. B. 10.4 m/s vertical. C. 22.0 m/s horizontal. D. 22.0 m/s vertical. E. 31.4 m/s horizontal.
In the Rutherford model of the hydrogen atom, a proton (mass M, charge Q) is the nucleus and an electron (mass m, charge q) moves around the proton in a circle of radius r. Let k denote the Coulomb force constant (1/4??0) and G the universal gravitational constant. The ratio of the electrostatic force to the gravitational force between electron and proton is:
A) kQq/GMmr2 B) GQq/kMm C) kMm/GQq D) GMm/kQq E) kQq/GMm
If you were standing on a cart that was at rest and free to roll (ignore friction) and someone threw a 10 kg ball at you, you would
A. roll backward faster if you caught the ball higher above the ground. B. roll backward faster if the ball bounced off of you elastically. C. not move if you caught the ball because you are more massive than the ball. D. roll backward faster if you caught the ball.