A 1000-kg car and a 2000-kg car are hoisted the same vertical distance in a service station. Raising the more massive car requires
A) less work.
B) as much work.
C) twice as much work.
D) four times as much work.
E) more than four times as much work.
Answer: C
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A string is wrapped tightly around a fixed pulley that has a moment of inertia of 0.0352 kg m2 and a radius of 12.5 cm. The string is pulled away from the pulley with a constant force of 5.00 N. As the string unwinds the pulley begins to rotate
What is the speed of the string after it has unwound 1.25 m? A) 2.09 m/s B) 2.36 m/s C) 1.18m/s D) 3.18 m/s E) 4.95 m/s
Potential-energy values may be
a. positive only. b. negative only. c. zero only. d. all of these.
The Paleozoic era ended and the Mesozoic era began about ______________ million years ago
Fill in the blank(s) with correct word
A 1 000-V battery, a 3 000-? resistor, and a 0.50-µF capacitor are connected in series with a switch. The capacitor is initially uncharged. What is the value of the current the moment after the switch is closed?
a.
0.39 A
b.
0.33 A
c.
0.84 A
d.
2 000 A