Which of the following forces are exerted on a satellite that is in orbit around Earth?
A. an attractive gravitational force directed toward the center of Earth
B. a force in the direction of the satellite's motion
C. an outward force directed away from the center of Earth
D. a and b
Answer: A. an attractive gravitational force directed toward the center of Earth
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Artificial transmutations are generally achieved using
a. Geiger counters. b. particle accelerators. c. tokamaks. d. mass spectrometers.
A refrigerator has a coefficient of performance of 1.15, and it extracts 7.95 J of heat from the cold reservoir during each cycle
(a) How much work is done on the gas in each cycle? (b) How much heat is exhausted into the hot reservoir in each cycle?
Why did the solar nebula heat up as it collapsed?
A) Nuclear fusion occurring in the core of the forming Sun produced energy that heated the nebula. B) As it shrank in size, gravitational potential energy was converted to thermal energy. C) It was heated by radiation from nearby stars. D) The shock wave from a nearby supernova heated the gas. E) Collisions among planetesimals generated friction and heat.
Helium-neon laser light (? = 632.8 nm) is sent through a single slit of width 0.55 mm. What is the width of the central maximum on a screen 1.4 m in back of the slit? (1 nm = 10?9 m)
a. 1.6E–3 m b. 8.0E–4 m c. 3.2E–3 m d. 7.5E–5 m e. 1.5E–4 m