An iPod uses 3.7 volts with direct current of 865 milliamps. What is the equivalent resistance of the entire iPod system?
A. 3200 ohms
B. 1 ohm
C. 8.4 ohms
D. 4.3 ohms
Answer: D
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A car travels north at 30 m/s for one half hour. It then travels south at 40 m/s for 15 minutes. The total distance the car has traveled and its displacement are:
A. 18 km; 18 km S. B. 36 km; 36 km S. C. 36 km; 36 km N. D. 90 km; 18 km N. E. 90 km; 36 km N.
Gaps in the asteroid belt (often called Kirkwood gaps) are caused by
A) tidal forces from the Sun. B) tidal forces from Jupiter. C) the competing gravitational tugs of Mars and Jupiter. D) orbital resonances with Jupiter.
The Moon's orbit around the Earth is tilted by about 5 degrees with respect to Earth's orbit around the Sun. As a result, the approximate number of solar eclipses that occur each year is approximately
A) 0. B) 24. C) 12. D) 2.
A key feature of the Falkirk Wheel in Scotland is that opposite gondolas have the same weight when both are brim-full of water
A) and boats in each have about equal weights. B) and at least one boat is in each gondola. C) regardless of the weights of boats or no boats in each. D) none of the above