An explosion occurs 34 km away. For sound that travels at 340 m/s, you'll hear the explosion in
A) 0.1 s.
B) 1 s.
C) 10 s.
D) 20 s.
E) more than 20 s.
Answer: E
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A person pushes horizontally on a heavy box and slides it across the level floor at constant velocity. The person pushes with a 60.0 N force for the first at which time he begins to tire
The force he exerts then starts to decrease linearly from 60.0 N to 0.00 N across the remaining How much total work did the person do on the box? A) 619 J B) 826 J C) 495 J D) 925 J
Which of the following molecules is most likely to show a dipole-dipole interaction?
A) H2S B) CO2 C) CH4 D) H-CImageC-H E) none of the above
Determine the total average hemispherical emissivity and the emissive power of a surface that has a spectral hemispherical emissivity of 0.8 at wavelengths less than 1.5 ?m. 0.6 at wavelengths from 1.5 to 2.5 ?m, and 0.4 at wavelengths longer than 2.5 ?m. The surface temperature is 1111 K.
GIVEN
• A surface at temperature (T) = 1111 K
• Spectral hemispherical emittance (??)
FIND
(a) The total average hemispherical emittance, ? (T)
(b) The emissive power, E(T)
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
A car travels at a steady 40.0 m/s around a horizontal curve of radius 200 m. What is the minimum coefficient of static friction between the road and the car's tires that will allow the car to travel at this speed without sliding?
A) 1.23 B) 0.816 C) 0.736 D) 0.952 E) 0.662