You have a P-V diagram for a device going through a cyclic process forming a closed loop on the diagram. How can you tell from the diagram whether the device is acting as a heat engine and not as a refrigerator?
a. The loop is longer than it is high which means it is acting as a refrigerator.
b. The loop is higher than it is long which means it is acting as a refrigerator.
c. The loop proceeds clockwise which means it is acting as a heat engine.
d. The loop proceeds counterclockwise which means it is acting as a heat engine.
C
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The specific heat capacity of copper is three times the specific heat capacity of lead. Equal masses of copper and lead are heated from room temperature to the temperature of boiling water. To achieve this, the amount of heat added to the copper is ___________ the amount of heat added to the lead
a. 1/9 b. 1/3 c. equal to d. 3 times e. 9 times
In an inertia balance, a body supported against gravity executes simple harmonic oscillations in a horizontal plane under the action of a set of springs. If a 1.00 kg body vibrates at 1.00 Hz, a 2.00 kg body will vibrate at
a. 0.500 Hz. b. 0.707 Hz. c. 1.00 Hz. d. 1.41 Hz. e. 2.00 Hz.
Why is the claim of fossilized life in the Martian meteorite ALH84001 controversial?
A) it is doubtful that the rock actually came from Mars B) the proposed fossilized organisms in no way resemble any kind of life found on Earth C) the rock is too young to have fossilized life within it D) there are many possible nonbiological explanations for the observed evidence
Metal detectors that locate metal beneath sand on a beach are activated by
A) electric fields. B) magnetic fields. C) electromagnetic induction. D) alternating current.