Satellites in low-Earth orbits are more likely to crash to Earth when the sunspot cycle is near solar maximum because ________
A) of increased magnetic interference
B) it is too dangerous to send the Space Shuttle to service satellites during solar maximum
C) they are more likely to have their electronics "fried" by a solar flare during solar maximum
D) Earth's upper atmosphere tends to expand during solar maximum, exerting drag on satellites in low orbits
D
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A flashlight, which uses two 1.5 V batteries in series, is turned on for 2.0 minutes. If the current in the flashlight is 100 mA, what is the energy dissipated?
A. 12 J B. 9.0 J C. 72 J D. 36 J E. 18 J
A high-frequency sound source produces a high
A) speed. B) amplitude. C) pitch. D) all of the above E) none of the above
To multiply two powers of ten:
a. multiply the exponents. b. add the exponents. c. multiply the numbers and add the exponents. d. multiply the exponents and add the numbers. e. multiply the numbers and subtract the exponents.
The current in amperes drawn by the heater is
a. 0.1 c. 144,000 b. 10 d. none of the above