How can we determine the reflectivity of an asteroid?
A) by taking a photograph of it
B) by measuring its mass and radius
C) by comparing its brightness in visible light to its brightness in infrared light
D) by where it is located in the asteroid belt
C
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A metal rod is placed between two temperature sources so that heat can flow between them. One temperature is 90.0
and the other temperature is 25.0
The length of the rod is 30.0 cm and the cross sectional area is 10.0 cm2 . If 15.0 watts of heat flows between the hot temperature and the cold temperature, then what is the coefficient of thermal conductivity for the metal?
A. 69.2 W/m•
B. 58.2 W/m•
C. 50.4 W/m•
D. 46.3 W/m•
E. 44.2 W/m•
A crate of weight w is being pushed across a horizontal surface by a force directed at an angle of 20° below the horizontal. What is the magnitude of the normal force on the crate?
a. It is less than w. b. It equals w. c. It is more than w. d. None of the above since the coefficient of kinetic friction is not given.
Light of intensity I0 and polarized horizontally passes through three polarizes
The first and third polarizing axes are horizontal, but the second one is oriented 20.0° to the horizontal. In terms of I0, what is the intensity of the light that passes through the set of polarizers? A) 0.442I0 B) 0.883I0 C) 0.780I0 D) 0.180I0
A typical shooting star in a meteor shower is caused by a ________ entering Earth's atmosphere
A) boulder-size particle from an asteroid B) boulder-size particle from a comet C) pea-size particle from an asteroid D) pea-size particle from a comet E) microscopic particle of interstellar dust