A 1.20-kg ball is hanging from the end of a rope. The rope hangs at an angle 25.0° from the vertical when a 15.0 m/s horizontal wind is blowing. If the wind's force on the rope is negligible, what drag force does the wind exert on the ball?
A) 32.3 N
B) 24.1 N
C) 3.68 N
D) 5.48 N
E) 11.8 N
Answer: D
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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?
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You need an ideal transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. The primary circuit has 130 windings and the secondary circuit is completed through a 55-? resistor
How many windings should the secondary circuit contain?