A stone is thrown straight up. When it reaches its highest point,
A) both its velocity and its acceleration are zero.
B) its velocity is zero and its acceleration is not zero.
C) its velocity is not zero and its acceleration is zero.
D) neither its velocity nor its acceleration is zero.
E) neither velocity nor acceleration can be determined without additional information.
B
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Sketch the circuit or network between four opaque body surfaces.
What will be an ideal response?
The isotope, tritium, has a half-life of 12.3 years. Assume we have 10 kg of the substance. What will be the disintegration constant (in s?1)?
a. 5.6 × 10^?2 b. 5.6 × 10^8 c. 3.2 × 10^7 d. 1.8 × 10^?9 e. 1.6 × 10^6
You will see that the Universe is almost 14 billion years old. That means that we see the most distant galaxies as they were when the Universe was:
A.) A few thousand years old. B.) 1-2 million years old. C.) 1-2 billion years old. D.) 4-6 billion years old. E.) 13 billion years old.
Consider the elliptical orbit of a comet around the Sun. Where in its orbit does it have the largest amount of total orbital energy?
A) when it is farthest from the Sun B) when it is closest to the Sun C) It always has the same total orbital energy.