An ac voltage can be increased or decreased easily using a
a. battery.
b. transformer.
c. fuse.
d. motor.
e. generator.
b
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A person on a sled coasts down a hill and then goes over a slight rise with speed 2.7 m/s. The top of this rise can be modeled as a circle of radius 4.1 m
The sled and occupant have a combined mass of 110 kg. If the coefficient of kinetic friction between the snow and the sled is 0.10, what friction force is exerted on the sled by the snow as the sled goes over the top of the rise? What will be an ideal response?
A ball is tied to the end of an 80.0-cm string and swings in a vertical circle about a fixed center under the influence of gravity. The speed of the mass at the bottom of the swing is 6.00 m/s. Which of the following statements is true?
A) The ball does not have enough energy to reach the top of the circle. B) The ball has enough energy to reach the top of the circle but the string becomes slack before it can reach that point. C) The ball has enough energy to continue revolving in a complete vertical circle. D) This question cannot be answered without knowing the mass of the ball. E) This question cannot be answered without knowing the tension in the string.
Which of the following quantities expressed in derived units includes the unit of length?
a. Area b. Volume c. Speed d. Density e. All of these
When an electrical switch is closed or opened in the vicinity of an operating AM radio, a burst of static can be heard. Which of the following, involving the throwing of the switch, would likely be the cause for this static?
a. The sound from the switching is the source of waves. b. Unnoticed lightning hits nearby every time the switch is thrown. c. Static happens without any cause. d. Electrons are accelerated during the switching process.