What stars form the slowest?
A. A and F
B. K and M
C. O and B
D. G and A
Answer: B
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Radioactive Decay: How long would it take 4.00 × 1020 atoms to decay to 1.00 × 1019 atoms if their half-life was 14.7 years?
A. 29.4 years B. 58.8 years C. 78.2 years D. 147 years
The amount that light of a distant galaxy is bent by the gravity of a nearby cluster of galaxies
A: allows us to measure the mass of the cluster. B: proves that dark matter does not exist in clusters. C: allows us to measure the mass of the galaxy.
Which travels with the greatest speed in a vacuum?
A) radio waves B) light waves C) X-rays D) gamma rays E) all have the same speed
A ball is tied to the end of an 80.0-cm string and swings in a vertical circle about a fixed center under the influence of gravity. The speed of the mass at the bottom of the swing is 6.00 m/s. Which of the following statements is true?
A) The ball does not have enough energy to reach the top of the circle. B) The ball has enough energy to reach the top of the circle but the string becomes slack before it can reach that point. C) The ball has enough energy to continue revolving in a complete vertical circle. D) This question cannot be answered without knowing the mass of the ball. E) This question cannot be answered without knowing the tension in the string.