More current will occur in a lamp when its filament is
A) cold.
B) hot.
C) either cold or hot.
Answer: A
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Two boxes of the same mass sit on a rough floor. These boxes are made of the same kind of cardboard and are identical except that one is twice as large as the other. If it takes 200 N to start moving the smaller box, how much force does it take to start moving the larger one?
A. Still 200 N B. 400 N C. 800 N D. It depends (specify)
Life on Earth remained single celled for ________ years, according to the microfossil record
Fill in the blank(s) with correct word
After seeing a flash of lightning, if one counts the seconds before hearing the thunder, one can estimate the distance to the flash. How many seconds delay
(a) per mile? (b) per kilometer?
Which of the following is part of the Sun's structure?
a. Globular cluster b. Accretion disk c. Singularity d. Corona