A series circuit consists of three identical lamps connected to a battery as shown in Figure OQ28.15. The switch S, originally open, is closed. What happens to the potential difference across lamp A?
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Suppose the laboratory wavelength of a spectral line is 600 nm. In a star it is measured to be 599.4 nm. Is the star moving toward or away from us, relative to the line of sight? How fast is it moving? (Hint: c = 300,000 km/s)
a. toward; 300 km/s b. away; 300 km/s c. at rest; 0 km/s d. sideways; 300 km/s e. toward; 150 km/s
This graph plots planetary mass on the horizontal axis and planetary radius on the vertical axis. Which of the four points marked by one of the bold numbers 1 through 4 represents a planet that has about the same composition as Earth but is larger in both size and mass?
A) Point 1 B) Point 2 C) Point 3 D) Point 4
A man-made satellite of mass 6105 kg is in orbit around the earth, making one revolution in 430 minutes. What is the magnitude of the gravitational force exerted on the satellite by the earth?
(The mass of the earth is 6.0 × 1024 kg and G = 6.67 × 10-11 N ? m2/kg2)
A satellite is in a circular orbit about the Earth at a distance of two Earth radii above the surface. What is the speed of the satellite? (The radius of the Earth is 6.4 × 10^6 m, and G = 6.67 × 10^-11 N × m2/kg2.)
a. 2800 m/s c. 5600 m/s b. 4600 m/s d. 16,800 m/s