An 920-g piece of iron at 100°C is dropped into a calorimeter of negligible heat capacity containing 50 g of ice at 0°C and 92 g of water, also at 0°C
What is the final temperature of the system? The specific heat of iron is 448 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg.
A) 0°C
B) 11°C
C) 14°C
D) 24°C
E) 32°C
D
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Five equal negative charges are uniformly spaced in a semicircular arc of radius r0 with its center at the origin. The charges positions in polar coordinates are given by (r0, ?i), where the values of ?i are 0°, 45°, 90°, 135°, and 180°. At the position (x, y) = (r0, –r0) in the 4th quadrant, which statement best describes the direction of the resulting electric field?
a. The direction is that of a 4th quadrant angle. b. The direction is that of a 3rd quadrant angle. c. The direction is that of a 1st quadrant angle. d. The direction is that of a 2nd quadrant angle.
What is the inductive reactance of a 200 mH inductor attached to a 120 V rms 60.0 Hz source?
A. 12.0 
B. 75.4
C. 188 
D. 940
E. 24.0
Force on a Moving Charge: An electron, moving south, enters a magnetic field. Because of this field, the electron curves upward. We may conclude that the magnetic field must have a component
A. downward. B. towards the east. C. upward. D. towards the west. E. towards the north.
A mass hangs on a spring held in a physicist's hand. When the mass is pulled down and then released, it oscillates with a period of 2.0 s. This system is taken to the Moon, where the acceleration of gravity is less. The spring on the Moon is held in an astronaut's hand, and the mass, when pulled down and released, will
A. oscillate with a shorter period. B. oscillate with a longer period. C. not oscillate at all. D. oscillate with an unchanged period.