An electron-volt is
A) the energy of one electron.
B) the charge of one electron.
C) the energy jump between the first and second energy levels of hydrogen.
D) an amount of energy much larger than a joule.
E) an amount of energy much smaller than a joule.
E
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The most distant point in the Moon's orbit is called _________________
a. apogee b. perigee c. perihelion d. aphelion
Alice bungee-jumps from a bridge above a deep gorge. Bob watches from the bridge. Let event D be Alice’s departure from Bob’s location on the bridge, and event R be her return to Bob’s location on the bridge. Carol observes these events from a a train passing over the bridge, and uses synchronized clocks on the train to measure the time between Alice’s departure and return. Which person’s watch or clocks register(s) a proper time between events D and R?
A. Alice B. Bob C. Carol D. Alice and Bob E. Bob and Carol F. Alice and Carol T. All three observers
A picture window in a house is 3 feet high by 5 feet long. If the window is 50ºF and the outside air temperature is -10ºF, estimate the heat transfer by natural convection from the window.
What will be an ideal response?
A current element (length = 1.0 cm) lies along the x axis with its center at x = 0 and carries a 20-A current in the positive x direction. Consider only the field of this current element and decide which combination of the following statements is correct. 1 . The field at (0, 0, 1.0 m) is in the positive z direction. 2 . The field at (0, 1.0 m, 0) is in the negative y direction. 3 . The field at
(1.0 m, 0, 0) is zero. 4 . The field at (0, 0, 1.0 m) is in the negative y direction. a. 3 and 4 b. 1 and 3 c. 2 and 4 d. 1 and 2 e. None of these