A mercury barometer
A) is an open tube manometer.
B) is a closed tube manometer.
C) measures gauge pressure.
D) is usually 760. cm tall.
E) does not contain mercury.
B
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A 2.0-kg object moving 5.0 m/s collides with and sticks to an 8.0-kg object initially at rest. Determine the kinetic energy lost by the system as a result of this collision
a. 20 J b. 15 J c. 30 J d. 25 J e. 5.0 J
RMS and Peak Quantities: A 0.150-kW lamp is plugged into a 120-V ac wall outlet. What are (a) the peak current through the lamp, (b) the rms current through the lamp, and (c) the resistance of the lamp?
What will be an ideal response?
According to the first law of thermodynamics, the sum of the heat gained by a system and the work done on that same system is equivalent to which of the following?
a. entropy change b. internal energy change c. temperature change d. specific heat
Why do some of the bright stars (such as the one indicated by the arrow) in this photo have cross-shaped spikes over them?
A) The spikes are an artifact of photography through a telescope. B) The spikes are flares ejected from the surfaces of bright stars. C) Very bright stars tend to be slightly nonspherical in shape and therefore look like they have spikes in photos. D) The stars with spikes are actually binary star systems.