A 200-g mass attached to the end of a spring causes it to stretch 5.0 cm. If another 200-g mass is added to the spring, the potential energy of the spring will be
A) twice as much.
B) times as much.
C) the same.
D) 4 times as much.
E) 3 times as much.
D
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The brightest stars in aging globular clusters will be:
A) core stars of planetary nebulae. B) massive blue main sequence stars like Spica. C) blue stragglers. D) red supergiants like Betelguese and Antares. E) blue supergiants like Rigel and Deneb.
An object is dropped from a position of rest. At the end of the first second of free fall it will have traveled about
1) 0 m 2) 5 m 3) 10 m and its velocity will be about 4) 0 m/s. 5) 5 m/s. 6) 10 m/s.
The parallax angle of the Sun is 1 arc second
a. True b. False Indicate whether the statement is true or false
This diagram shows a person on a planet watching you travel to the right at 0.9c, while you have a flashlight turned on with the light shining to the right. Which of the following statements is not true from your point of view?
A) If you can increase your speed by another 0.1c, you'll be able to keep up with the flashlight beam. B) The person and planet are moving to your left at 0.9c. C) Time is running slow for the person on the planet. D) The light from the flashlight beam is moving to the right at the speed of light c.