Engine #1 produces twice the power of engine #2. Can we conclude that engine #1 does twice as much work as engine #2?
a) yes
b) no
Ans: b) no
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The astronomical unit (AU) is defined to be equal to the
A) average distance between the Earth and Sun B) average distance between the Sun and the planet Pluto C) distance between the Sun and the nearest star D) diameter of the Earth
Let's say that a gas decreases in temperature, but that its volume remains constant during this process. What happens to its internal energy in this case?
1.The internal energy decreases. 2.The internal energy increases. 3.The internal energy remains constant. 4.It cannot be determined whether it will increase, decrease, or remain the same.
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.
A 3rd magnitude star appears 2.5 times brighter than a 4th magnitude star
Indicate whether the statement is true or false