Suppose that a car traveling to the west (-x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration must be correct?
A) Its acceleration is decreasing in magnitude as the car slows down.
B) Its acceleration is positive.
C) Its acceleration is negative.
D) Its acceleration is zero.
B
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If a person weighs 252 lb on Earth, what will the person weigh on the Moon?
a. 42 lb b. 1512 lb c. 252 lb d. 126 lb e. 25.2 lb
Two parallel conductors are carrying currents in the opposite direction. The currents are non-zero and not necessarily equal. The magnitude of the magnetic field midway between them is 40 mT. If one of the currents then has its direction reversed, what is the resulting magnitude of the magnetic field midway between them?
a. a value greater than 40 mT c. 40 mT b. a value less than 40 mT d. It could be any value.
Consider the circuit below. Switch S is closed at t = 0
What is the current through the capacitor
C just after the switch is closed?
The power expended doing 100 J of work in 50 s is
A) 1/2 W. B) 2 W. C) 4 W. D) 50 W. E) 5,000 W.