A 100-kg student eats a 200-Calorie doughnut. To "burn it off", he decides to climb the steps of a tall building. How high (in m) would he have to climb to expend an equivalent amount of work? (1 food Calorie = 103 calories.)
a. 273
b. 623
c. 418
d. 854
e. 8 400
D
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How can a large asteroid impact in one spot on Earth affect the climate of the entire Earth?
A) The impact releases greenhouse gases that immediately make Earth warmer. B) The impact blasts a hole through Earth's mantle, allowing hot metal from the core to rise up and heat the world. C) The impact blasts debris into Earth's atmosphere that blocks sunlight, making Earth's surface cooler. D) The impact tears a hole in Earth's atmosphere, allowing heat energy to escape and thereby cooling our planet.
RMS and Peak Quantities: An alternating current is supplied to an electronic component with a rating that the voltage across it can never, even for an instant, exceed 16 V. What is the highest rms voltage that can be supplied to this component while staying below the voltage limit?
A. 8
V
B. 16
V
C. 256 V
D. 8 V
Suppose that we have two containers, one holding N molecules of helium gas, and one holding N/2 molecules of oxygen gas. Both are initially at room temperature. We then add the same amount of energy to each gas. Which is hotter at the end?
A. The helium B. The oxygen C. Both have about the same temperature. D. One cannot say without measuring.
Which is the smallest?
A. The distance from the Sun to its nearest neighboring star B. The distance from the Sun to the Andromeda Galaxy C. The distance from the Sun to the Virgo cluster of galaxies D. The distance from the Sun to the center of the Milky Way Galaxy E. The Solar System.