You conduct the following three ball drops, in each case measuring the time it takes for the ball to fall to the ground; the mass is the mass of the ball and the height is the height from which you drop the ball:
Ball Drop 1. Mass 0.5 kilograms, height 20 meters
Ball Drop 2. Mass 5.0 kilograms, height 20 meters
Ball Drop 3. Mass 0.5 kilograms, height 30 meters
Which pair of ball-drops will best test whether mass affects the acceleration of gravity?
A) ball drops 2 and 3
B) ball drops 1 and 3
C) ball drops 1 and 2
C) ball drops 1 and 2
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Which of the following is not true?
a. 2500 years ago people believed that earth is a sphere b. galileo discovered the phases of the moon c. edmund halley was the first to discover halley's comet d. le verrier predicted neptune without using a telescope e. Eris is larger than Pluto
An iron atom’s nucleus has 26 protons and 30 neutrons. A helium atom’s nucleus has 2 protons and 2 neutrons. Solid iron is much denser than helium gas. How does the total positive charge in a gram of iron compare to that of a gram of helium?
A. Iron has more positive charge than helium per gram. B. Iron has the same positive charge as helium per gram. C. Iron has less positive charge than helium per gram. D. There is not enough information to tell.
A 60 kg boy standing on a skateboard with frictionless wheels and negligible mass throws a 3 kg ball straight up with a speed of 4 m/s. If the boy was at rest before the throw, his speed after the throw will be ________.
Fill in the blank(s) with the appropriate word(s).
What capacitance is needed in series with a 3.7-mH inductor so the circuit will oscillate at a frequency of 1000 Hz?
A) 0.15 mF B) 15 ?F C) 6.8 ?F D) 0.015 ?F