A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.If two slide projectors are connected in parallel across the same 120-volt source, the current drawn from the source is __________
Fill in the blank(s) with correct word
12 amperes
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Two identical objects, one light colored and the other dark colored, are at the same elevated temperature, 50°C. You now place them in a dark, much cooler room. Which object will reach the room's temperature first?
A. The light colored object B. Both reach room temperature at same time C. The dark colored object D. As strange as it seems, neither object will ever reach room temperature because energy conservation prevents the loss of energy
Which spacecraft was the first to photograph Uranus in 1986?
a. Hubble Space Telescope b. Cassini-Huygens c. Cassini-Huygens d. Voyager 2 e. New Horizons
When the momentum of a punch is stopped by the fighter's jaw while he moves into the oncoming punch, the result is
1) an increase in the relative velocity of the blow, 2) a decrease in the time of contact of the blow, which thereby most greatly increases the 3) force. 4) impulse. 5) momentum. 6) inertia. 7) energy.
The fundamental frequency of a above middle C on the piano is 440 Hz. This is the tenor high A, but a convenient note in the mid-range of women's voices. When we calculate the wavelength, we find that it is
a. much shorter than the length of either a man's or woman's lips. b. shorter than the length of a man's lips, but about the length of a woman's lips. c. longer than a woman's lips, but about the length of a man's lips. d. much longer than the length of either a man's or a woman's lips. e. about the same length as either a man's or woman's lips.