Which will melt more ice when placed on its surface, a kilogram of wood or a kilogram of iron of the same high temperature?
A) 1 kg of wood.
B) 1 kg of iron.
C) both the same
D) neither of these
Answer: A
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When you pull an object, such as a table, across the floor, the forward force by you on the table is equal but opposite to the backward force by the table on you
It seems as though these two forces should balance out, so that the table can't be moved. But the table does move, because A) the force by you on the table is larger than the force of the table on you. B) the floor pushes forward on the table. C) the momentum always acts in a forward direction. D) only one of these two forces actually acts on the table. E) Newton's laws do not apply to the table considered as a separate object.
How many megabytes are there in a gigabyte?
a. 10 b. 1000 c. 1000000 d. none of the above
A parallel-plate capacitor is disconnected from a battery, and the plates are pulled a small distance further apart. Does the energy stored in the capacitor increase, decrease, or stay the same?
1.increase 2.decrease 3.remains the same
An astronomer would find a type Ia supernova in a distant galaxy useful as a(n) ____
a. spiral tracer b. gravitational lens c. age calibration d. rotation curve e. standard candle