An engine delivers 40.0 J of work while it takes in energy from a 400 K thermal source. If the engine discharges energy into a thermal reservoir at 200 K, then what is the least amount of heat needed to run the engine?
A. 55.0 J
B. 65.0 J
C. 80.0 J
D. 110 J
C. 80.0 J
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A carnival Ferris wheel has a 15-m radius and completes five turns about its horizontal axis every minute. What is the acceleration of a passenger at his lowest point during the ride?
a. 5.7 m/s2 downward b. 4.1 m/s2 upward c. 14 m/s2 downward d. 4.1 m/s2 downward e. 19 m/s2 downward
Which of the following is not considered to be one of the four fundamental forces?
A) the gravity force B) the meson force C) the weak nuclear force D) the strong nuclear force E) the electromagnetic force
A taxicab moves five blocks due north, five blocks due east, and another three blocks due north. Assume all blocks are of equal size. How far is the taxi from its starting point?
a. 13 blocks c. 9.2 blocks b. 9.4 blocks d. 8.6 blocks
The corrosion resistance of titanium alloys is due to the formation of a protective layer of titanium _________on the surface.
Fill in the blank(s) with the appropriate word(s).