All of the following hypothetical planets orbit a star with the same mass as the Sun (one solar mass)
Which one has the shortest orbital period? (If two objects would have the same orbital period to within a difference of less than 1% consider them as having identical periods.)
A) Planet A: one Earth mass and 1 AU from the star
B) Planet B: two Earth masses and 1 AU from the star
C) Planet C: two Earth masses and 2 AU from the star
D) Planets A and B
E) Planets B and C
F) All of them have the same period.
D
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Scientific Notation: Which one of the following numbers is equivalent to the number 0.0001776?
A. 1.776 × 10-4 B. 17.76 × 10-3 C. 1776 × 10-5 D. 177.6 × 10-7
The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW
The heating element shorts out and, in repairing it, the repairman shortens the nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element? A) The power increases to 2.2 kW. B) The power is still 2.0 kW. C) The power decreases to 1.8 kW. D) None of the given answers is correct.
The model we have constructed in this chapter neglects feedback effects that might accelerate or brake the warming. It is possible that higher temperatures will yield increased evaporation and increased cloud cover. Will this accelerate or brake the warming compared to the predictions of the model in the text?
A. Accelerate B. Brake C. No change
Neglecting air resistance, a bullet fired straight down from the top of a high cliff has an acceleration of
A) less than 10 m/s2. B) 10 m/s2. C) more than 10 m/s2. D) depends on the height of the cliff.