During the period of one day, the number of high tides at a given point is about
a. one.
b. two.
c. three.
d. four.
e. none of the above.
b
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Thermodynamic Devices: A refrigerator has a performance coefficient (COP) of 1.15, and it extracts 7.95 J of heat from the cold reservoir during each cycle.(a) How much work is done on the gas in each cycle?(b) How much heat is exhausted into the hot reservoir in each cycle?
What will be an ideal response?
A current of 2.0 A in the 100-turn primary of an ideal transformer causes 14 A to flow in the secondary. How many turns are in the secondary?
A) 700 B) 4 C) 114 D) 14
A 17-mm-wide diffraction grating has rulings of 530 lines per millimeter. White light is incident normally on the grating. What is the longest wavelength that forms an intensity maximum in the fifth order?
A) 377 nm B) 352 nm C) 402 nm D) 427 nm E) 452 nm
A 70-kg stunt artist rides in a rocket sled which slides along a flat inclined surface. At an instant when the sled's acceleration has a horizontal component of 6.0 m/s2 and a downward component of 2.8 m/s2, what is the magnitude of the force on the rider by the sled?
a. 0.83 kN b. 0.98 kN c. 0.65 kN d. 0.68 kN e. 0.72 kN