General Questions: A bucket is being lowered by a very light rope with a constant downward velocity. The tension in the rope must be
A. equal to the weight of the bucket.
B. greater than the weight of the bucket.
C. less than the weight of the bucket.
Answer: A
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If the force of gravity exerted on the Sun by Earth is the same as the force exerted by Earth on the Sun, why does Earth orbit the Sun, and not the other way around?
A. They each orbit around the geometric center of the system. B. Earth is less massive, and is accelerated more by the gravitational force and moves faster. C. Planets, by definition, orbit the Sun, and not the other way around. D. The combined gravitational forces of all the planets keeps the Sun at the center of the Solar System. E. None of these choices is correct.
An observer moving toward a stationary sound source hears a(n) ______________ in frequency
Fill in the blank(s) with correct word
A planet has two small satellites in circular orbits around the planet. The first satellite has a period 12.0 hours and an orbital radius 6.00 × 107 m. The second planet has a period 16.0 hours. What is the orbital radius of the second satellite?
A) 4.50 × 107 B) 3.90 × 107 C) 9.24 × 107 D) 8.00 × 107 E) 7.27 × 107
Energy in the Electric Field: Each plate of a parallel-plate air-filled capacitor has an area of 0.0040 m2, and the separation of the plates is 0.020 mm. An electric field of 8.2 × 106 N/C is present between the plates. What is the energy density in the region between the plates? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 300 J/m3 B. 200 J/m3 C. 400 J/m3 D. 500 J/m3 E. 610 J/m3