Your friend Alf tells you that the magnetic force on a stationary 10 C charge near the north pole of a magnet having a magnetic field of 0.10 tesla is twice as great as that on a stationary 5.0 C charge at exactly the same position
Discuss this with your friend and explain how he is correct or incorrect.
Your friend is both right and wrong. If the charge is stationary, there will be zero
magnetic force on it; a charge must be moving to have a magnetic force acting. Zero is twice
as great as zero, so in this sense your friend is correct.
Undoubtedly, though, the friend meant that factor of two to mean something. He or she
thought that there was a definite nonzero answer for the force, and this cannot be correct.
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A wheel rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity increases to 40 rad/s. Assume that the angular acceleration was constant during the 5.0-s interval. How many revolutions does the wheel turn through during the 5.0-s interval?
a. 20 rev b. 24 rev c. 32 rev d. 28 rev e. 39 rev
If we know that a nonzero net force is acting on an object, which of the following must we assume regarding the object's condition? The object is:
a. at rest. c. being accelerated. b. moving with a constant velocity. d. losing mass.
Which would require the greater change in a satellite's orbital speed (8 km/s); slowing down so it crashes into Earth, or speeding up so it escapes Earth?
A) slowing down B) speeding up C) same each way D) need more information
The center of mass and the center of gravity coincide
A) only if the object is symmetrical. B) only if the object is symmetrical and it is in a uniform gravitational field. C) if the object is in a uniform gravitational field. D) at all times.