In a reflecting telescope the primary is a _______
a. prism
b. mirror
c. lens
d. diffraction grating
e. photographic plate
b
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An inventor suggests that a house might be heated by using a refrigerator to draw energy as heat from the ground and reject energy as heat into the house. He claims that the energy supplied to the house as heat can exceed the work required to run the refrigerator. This:
A. is impossible by first law B. is impossible by second law C. would only work if the ground and the house were at the same temperature D. is impossible since heat energy flows from the (hot) house to the (cold) ground E. is possible
Conversion of Units: The column of Trajan, erected in Rome in 106-113 A.D., is 125 feet tall. What is its height in centimeters? (2.54 cm = 1.00 in.)
A. 1510 cm B. 591 cm C. 2520 cm D. 3810 cm E. 38,100 cm
A cube of wood of density 0.780 g/cm3 is 11.2 cm on a side. When placed in water, what height of the block will float above the surface? (water density = 1.00 g/cm3)
a. 8.74 cm b. 11.2 cm c. 2.46 cm d. 3.46 cm e. 1.46 cm
The focal lengths of the objective lens and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively
An object is placed at 0.30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain for persons with a near point of 25 cm. The magnitude of the final overall magnification of the microscope is closest to A) 100 B) 200 C) 300 D) 410 E) 500