If a lightning bolt involves a discharge of 48 coulombs, about how many electrons are involved?
a. 3 × 10^23
c. 0.3 × 10^18
b. 3 × 10^20
d. 0.3 × 10^8
B
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A rectangular loop of wire carrying a 4.0-A current is placed in a magnetic field of 0.60 T
The magnitude of the torque acting on this wire when the plane of the loop makes a 30° angle with the field is measured to be 1.1 N ? m. What is the area of this loop? A) 0.20 m2 B) 0.40 m2 C) 0.26 m2 D) 0.80 m2 E) 0.53 m2
A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball that is initially at rest. Both move with a combined momentum of
A) less than 1 unit. B) more than 1 unit. C) 1 unit. D) need more information
The difference between a DC and an AC generator is that
A. the DC generator has one unbroken slip ring. B. the AC generator has one unbroken slip ring. C. the DC generator has one slip ring split in two halves. D. the AC generator has one slip ring split in two halves. E. the DC generator has two unbroken slip rings.
What are the important modes of heat transfer for a person sitting quietly in a room? What if the person is sitting near a roaring fireplace?
GIVEN - Person sitting quietly in a room - Person sitting in a room with a fireplace FIND (a) Modes of heat transfer for each situation ASSUMPTIONS - The person is clothed