A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the mass is at the lowest point on the circle, the speed of the mass is 12 m/s. What is the magnitude of the force of the string on the mass at this position?
A. 31 N
B. 36 N
C. 41 N
D. 46 N
E. 23 N
Answer: C
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Two charged objects attract one another with a force F. If the charge on both objects is doubled and the distance between them is also doubled, what will be the force between them?
Why is there a two-day difference in the sidereal and synodic months?
A) The Moon speeds up at perigee, and slows down at apogee. B) The sidereal day is four minutes shorter than the solar day, and it adds up. C) The Earth is closer to the Sun during the sidereal month. D) The Earth is also revolving around the Sun, so the Moon must "catch up." E) The Moslem lunar year is only 354 days long, on average.
Tritium is radioactive with a half-life of 12.33 years decaying into 3He with low-energy electron emission. If we have a sample of 1.91 × 10^18 tritium atoms, what is its activity in decays/second? (1 year = 3.15 × 10^7 s)
a. 4.92E+9 decays/second b. 3.41E+9 decays/second c. 1.07E+17 decays/second d. 6.69E+16 decays/second e. 3.41E+10 decays/second
Wave Characteristics: A laser beam takes 24 ms to travel from a rocket to the reflective surface of a planet and back to the rocket. How far is the rocket from this planet's surface? (c = 3.0 × 108 m/s)
A. 2400 km B. 1200 km C. 1800 km D. 3600 km E. 4800 km