The first pulsar was discovered by __________ in November of 1967
a. Jocelyn Bell
b. Isaac Newton
c. Albert Einstein
d. Walter Baade
e. Edwin Hubble
A
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Index of Refraction: If the index of refraction of a material is 2, this means that light travels
A. 2 times as fast in air as it does in vacuum. B. 2 times as fast in the material as it does in air. C. 2 times as fast in vacuum as it does in the material. D. 2 times as fast in the material than it does in vacuum. E. 1/2 as fast in air as it does in the material.
You throw a ball straight up into the air. In addition to gravity, the ball feels a force due to air resistance. Compared to the time it takes the ball to go up, the time it takes to come back down is:
a) smaller b) the same c) greater
No work is done by gravity on a bowling ball that rolls along a bowling alley because
A) no force acts on the ball. B) little distance is covered by the ball. C) the force on the ball is at right angles to the ball's motion. D) the ball's speed remains constant.
The symbol for deuterium is . How many protons are there in a deuterium nucleus?
What will be an ideal response?