A 7.0-? resistor is connected across the terminals of a battery having an internal emf of 10 V. If there is a 0.50-A current through the circuit, what is the internal resistance of the battery?
A) 13 ?
B) 20 ?
C) 10.8 ?
D) 27.0 ?
A
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Find the frequencies of the first three harmonics of a 1.0-m long string which has a mass per unit length of 2.0 × 10^?3 kg/m and a tension of 80 N when both ends are fixed in place
To divide two powers of ten:
a. multiply the exponents. b. divide the exponents. c. subtract the numbers and divide the exponents. d. divide the numbers and add the exponents. e. divide the numbers and subtract the exponents.
The evidence for recent geological activity on Pluto came as a surprise to most scientists, because they did not expect Pluto to retain enough heat to drive such activity. Which of the following best explains why Pluto is so geologically active despite its small size?
A. The activity is driven by tidal heating caused by Pluto’s moons. B. Pluto’s tall mountains built of water ice must be unstable, and when they collapse they can cause geological activity C. The activity is driven by heat from the many impacts that occur in the Kuiper belt. D. The activity involves nitrogen ice, so Pluto does not need much heat to cause this ice to undergo change. E. The activity is driven by the heat of a subsurface ocean.
A tennis ball bounces on the floor three times, and each time it loses 23.0% of its energy due to heating. How high does it bounce after the third time, if we released it from the floor?
A) 180 cm B) 18 cm C) 180 mm D) 240 cm