If Newton's law of universal gravitation turned out to be Gm1m2/r rather than Gm1m2/r2, tides on Earth
A. would not happen because the force of gravity from the Moon would be too strong.
B. would still occur because each side of the Earth would feel a different gravitational force from the Moon.
C. would not occur because gravity would then be a repulsive force.
D. would not occur because the Sun would cancel out the Moon's gravity.
Answer: B
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The larger variation in brightness of a partially eclipsing system consisting of a B2 main-sequence star and an M2 main-sequence star occurs when the B2 star passes in front of the M2 star
a. True b. False Indicate whether the statement is true or false
The period of an Earth satellite depends on the satellite's
A) mass. B) weight on Earth. C) radial distance from Earth. D) all of the above E) none of the above
A 0.25-m string, vibrating in its sixth harmonic, excites a 0.96-m pipe that is open at both ends into its second overtone resonance. The speed of sound in air is 345 m/s. The common resonant frequency of the string and the pipe is closest to
A) 540 Hz. B) 360 Hz. C) 450 Hz. D) 630 Hz. E) 700 Hz.
Tritium (3H) has a half-life of 12.3 years and releases 0.0186 MeV energy per decay. What is the activity of a 9.0-gram sample of tritium? (NA = 6.02 × 10^23 mol–1, 1 year = 3.16 × 10^7 s, 1 MeV = 1.6 × 10^–13 J, and mt = 3.01605 u)
a. 1.3 × 10^16 Bq c. 3.6 × 10^14 Bq b. 1.1 × 10^15 Bq d. 3.2 × 10^15 Bq