A reversible engine takes in 555. Joules per second and exhausts 482. watts
(a) How much power does it produce?
(b) What is its efficiency?
(c) If operated in reverse as a refrigerator, what would be its COP?
(a) 73. watts
(b) 13.2%
(c) 6.60
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Radioactive Decay: If the half-life of a material is 45 years, how much of it will be left after 100 years?
A. more than 1/2 B. less than 1/2 but more than 1/4 C. more than 1/4 but less than 1/2 D. less than 1/4 but more than 1/8 E. less than 1/8
The sound level at 1.0 m from a certain talking person talking is 60 dB. You are surrounded by five such people, all 1.0 m from you and all talking equally loud at the same time. The threshold of hearing is 1.0 × 10-12 W/m2.What sound level are you being exposed to? You can neglect any absorption, reflection, or interference of the sound. The threshold of hearing is 1.0 × 10-12 W/m2.
A) 300 dB B) 60 dB C) 74 dB D) 67 dB E) 81 dB
What do we mean by uniform linear motion?
Ice melts at
A. 0 K B. 0 C C. 0 F D. 100 C