The voltage across the input terminals of a transformer is 110 V. The primary coil has 50 loops and the secondary coil has 100 loops. The output is
A) 25 V.
B) 55 V.
C) 110 V.
D) 220 V.
E) none of the above
Answer: D
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Solenoid: An ideal solenoid that is 34.0 cm long is carrying a current of 2.00 A. If the magnitude of the magnetic field generated at the center of the solenoid is 9.00 mT, how many turns of wire does this solenoid contain? (?0 = 4? × 10-7 T ? m/A)
A. 860 B. 1590 C. 2320 D. 3180 E. 1220
A neutral atom has an electron configuration of 1s22s22p63s23p2. How many protons does it have in its nucleus?
A) 5 B) 11 C) 14 D) 20 E) 26
What would be the expected radius of a nucleus having 82 protons and 125 neutrons?
A) 5.2 fm B) 5.9 fm C) 6.0 fm D) 7.1 fm E) 17 fm
Work-Energy Theorem: A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m. If the coefficient of kinetic friction between the object and the surface is 0.20, what was the initial speed of the object?
A. 9.8 m/s B. 6.3 m/s C. 3.6 m/s D. 7.2 m/s E. 8.9 m/s