A metal sphere of radius 10 cm carries a charge of +2.0 ?C. What is the magnitude of the electric field 5.0 cm from the sphere's surface?
A) 4.0 × 105 N/C
B) 8.0 × 105 N/C
C) 4.0 × 107 N/C
D) 8.0 × 107 N/C
E) 4.0 × 109 N/C
B
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AC Generator: A circular coil with 600 turns has a radius of 15 cm. The coil is rotating about an axis perpendicular to a magnetic field of 0.020 T. If the maximum induced emf in the coil is 1.6 V, at what angular frequency is the coil rotating?
A. 0.30 rad/s B. 0.60 rad/s C. 0.90 rad/s D. 1.4 rad/sec E. 1.9 rad/s
The CNO cycle produces energy by fusing
A. silicon into iron. B. hydrogen into helium. C. neon into magnesium and oxygen. D. carbon and nitrogen into oxygen.
An electron is accelerated from rest through a potential difference of 3750 V. It enters a region where the magnetic field is 4.0 mT perpendicular to the velocity of the electron. Calculate the radius of the path this electron will follow
A) 1.2 cm B) 2.2 cm C) 3.2 cm D) 4.2 cm E) 5.2 cm
Water flows into a swimming pool at the rate of 7.0 gal/min. The pool is 17 ft wide, 32 ft long and 7.0 ft deep. How long does it take to fill? (1 U.S. gallon = 231 cubic inches)
a. 34 hours b. 68 hours c. 67 hours d. 136 hours e. 680 hours