For a cube-shaped room, 10 ft on a side, what will be the rate of heat loss if the R-value is 4 ft2-°F hr/Btu for each side and the ?T is 50 F?
a. 800 b. 1200 c. 5000 d. 7500 e. 12,000 Btu/hr
d
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The center of our galaxy contains a very intense source of radio and X-ray radiation named Sgr A*. What is it about this source that supports the idea that the radiation comes from a black hole? a. The radiation is strongly blueshifted, indicating that the object is collapsing
b. The radiation is strongly redshifted indicating that the object is growing. c. The radiation is coming from an incredibly small object. d. Radio waves can only be produced by matter orbiting a black hole. e. Only radiation from a black hole could penetrate the giant molecular clouds between Sgr A and Earth.
A conclusion from special relativity is that events that are simultaneous in one inertial frame
A. are simultaneous in all inertial reference frames. B. are simultaneous in all inertial frames moving at the same speed. C. may not be simultaneous in another inertial reference frame. D. are simultaneous in inertial reference frames moving in the same direction. E. are simultaneous in inertial reference frames moving in the opposite direction.
The sound of a band is rated as 50 dB at a distance of 30.0 m. What is the dB sound level of the band when one is 10.0 m from the band?
A. 59.5 dB B. 57.3 dB C. 55.2 dB D. 52.9 dB E. 50.1 dB
Refer to the graph. The acceleration of the object is equal to zero
A. in region A. B. in region B. C. in region C. D. in regions A and C. E. The acceleration is never equal to zero