A straight wire (length = 8.0 m) is bent to form a square. If the wire carries a current of 20 A, what is the magnitude of the magnetic field at the center of the square?
a. 17 ?T
b. 14 ?T
c. 11 ?T
d. 20 ?T
e. 36 ?T
c
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A runner generates 1260 W of thermal energy. If this heat has to be removed by evaporation, how much water does this runner lose in 15 minutes of running? The latent heat of vaporization of water is 22.6 × 105 J/kg
A) 50 g B) 500 g C) 35 g D) 350 g E) 40 g
The mass of Pluto is 1.31 × 1022 kg and its radius is 1.15 × 106 m. What is the acceleration of a freely-falling object at the surface of Pluto if it has no atmosphere? (G = 6.67 × 10-11 N ? m2/kg2 )
A) 9.81 m/s2 B) 1.62 m/s2 C) 3.72 m/s2 D) 0.661 m/s2 E) 0.140 m/s2
A lens of focal length 90 mm is used as a magnifier. The object being viewed is 9.9 mm long, and is positioned at the focal point of the lens. The angle subtended by the image at infinity, in milliradians, is closest to:
A) 110 B) 73 C) 37 D) 147 E) 183
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?