An inventor tries to sell you his new engine which takes in 40. Joules of heat at 87°C on each cycle, expels 30. Joules at 27°C, and does 10. Joules of work. Why are you not fooled, and can have him prosecuted as a fraud?
What will be an ideal response?
The greatest efficiency possible between those temperatures would be 17% (1-300/360 ) and he has claimed a higher efficiency than is physically possible.
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A 2.00-m rod of negligible mass connects two very small objects at its ends. The mass of one object is 1.00 kg and the mass of the other is unknown. The center of mass of this system is on the rod a distance 1.60 m from the 1.00-kg mass object
What is the mass of the other object? A) 4.11 kg B) 3.22 kg C) 4.00 kg D) 0.250 kg E) 0.800 kg
The following three appliances are connected to a 120-V house circuit: i) toaster, 1 325 W, ii) coffee pot, 650 W, and iii) microwave, 600 W. If all were operated at the same time, what total current would they draw?
a. 2.10 A b. 47.5 A c. 7.15 A d. 21.5 A e. 11.0 A
Explain the difference between cosmic rays and electromagnetic radiation, and how cosmic particles are captured
What will be an ideal response?
A rocket is launched from the origin with an acceleration of 20.0 
at an angle of 30.0 degrees above the horizontal. The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted. The rocket then falls with an acceleration of 9.80
downward. What is the total time of flight?
A. 6.02 s B. 6.91 s C. 7.23 s D. 7.44 s E. 8.02 s