The speed of light is about 300,000 km/s (3 × 105 km/s). How far does light travel in 30 seconds?
A) 300 thousand km (300,000, or 3 × 105 km) B) 9 million km (9,000,000, or 9 × 106 km)
C) 10 thousand km (10,000, or 106 km) D) 900 thousand km (900,000, or 9 × 105 km)
B
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Charge of uniform density 50 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 5.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis).
A. 2.7 V B. 2.0 V C. 2.4 V D. 1.7 V E. 3.4 V
The speed of sound in air is a function of which one of the following?
a. wavelength c. temperature b. frequency d. amplitude
How does the interstellar medium affect our view of most of the galaxy?
A) It prevents us from seeing most of the galactic disk with visible and ultraviolet light. B) It absorbs all wavelengths of light. C) It produces so much visible light that it blocks our view of anything beyond it. D) It has no effect on visible-light observations, but prevents us from studying the galactic center with radio waves or X-rays.
0.45 kg of a metal at 90.°C is added to 0.40 kg of water at 20.0°C
(a) If the final temperature of the mixture is 26.°C, what is the specific heat of the metal? (b) If the water container has a significant heat capacity, will this increase or decrease the metal specific heat determined in part "a"given the same data?