Suppose that a car traveling to the west (the -x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration in the x direction is correct?
A) Both its acceleration and its velocity are positive.
B) Both its acceleration and its velocity are negative.
C) Its acceleration is positive but its velocity is negative.
D) Its acceleration is negative but its velocity is positive.
Answer: C
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Which of the following screwdrivers would likely be the most effective to loosen a stubborn screw? Assume the size of the driver head is the same in each case
1.one with a handle that is 8 cm long and 2 cm wide 2.one with a handle that is 12 cm long and 2 cm wide 3.one with a handle that is 8 cm long and 4 cm wide 4.They would all loosen the screw just as effectively.
According to this graph, a planet with 10 times the mass of Jupiter would have a radius about ________ as that of Jupiter.
A) the same B) 10 times as large C) 100 times as large D) 60% as large
Faraday's law tells us that
A) moving charges create magnetic fields. B) charges create electric fields. C) a changing magnetic field creates an electric field. D) a changing electric field creates a magnetic field. E) magnetic fields create electric fields.
The average adult radiates heat energy at the same rate as
a. a 10-W light bulb. b. a 100-kW light bulb. c. a 100-W light bulb. d. none of these.