The Earth is 1.49 × 10^11 meters from the sun. If the solar radiation at the top of the Earth's atmosphere is 1340 W/m2, what is the total power output of the sun?
a. 7.10 × 10^27 W
b. 2.20 × 10^30 W
c. 6.62 × 10^26 W
d. 3.74 × 10^26 W
e. 2.98 × 10^25 W
d
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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•
Which of the following is not visible during totality of a total solar eclipse?
a. the corona of the sun. b. the chromosphere of the sun. c. prominences. d. the photosphere of the sun. e. all of the above
A high-speed dart is shot from ground level with a speed of 150 m/s at an angle 30° above the horizontal. What is the vertical component of its velocity after 4.0 s if air resistance is neglected?
A) 130 m/s B) 150 m/s C) 38 m/s D) 36 m/s E) 75 m/s
The natural radioactivity in a typical human body is closest to
A. 0.2 per hour B. 12 per hour C. 12 per minute D. 4000 per second