An objective lens of a telescope has a 1.90 m focal length. When viewed through this telescope, the moon appears 5.25 times larger than normal. How far apart are the objective lens and the eyepiece when this instrument is focused on the moon?
What will be an ideal response?
2.26 m
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The light radiated from the Sun's surface reaches Earth in about 8 minutes, but the energy of that light was released by fusion in the solar core about ________
A) a few hundred thousand years ago B) one hundred years ago C) three days ago D) one thousand years ago
A 20-ton truck collides with a 1500-lb car. Which of the following statements must be true?
A) During the collision, the force on the truck is smaller than the force on the car. B) The car did not slow down during the collision, but the truck did. C) During the collision, the force on the truck is equal to the force on the car. D) The truck did not slow down during the collision, but the car did. E) During the collision, the force on the truck is greater then the force on the car.
A 4.00-L container holds half a mole of an ideal gas at a pressure of 18.5 atm. What is the gas temperature? (R = 0.0821 L • atm/mol • K)
a. 1800 K c. 901 K b. 1190 K d. 450 K
A heat engine ________
a. converts work into heat energy b. needs a temperature difference to be able to work c. can be 100% efficient in the absence of friction d. needs electricity to be able to run