The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.
e
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A wave travels an average distance of 1 m in 1 s with a frequency of 1 Hz. Its amplitude is
A) less than 1 m. B) 1 m. C) more than 1 m. D) not enough information
A uniform solid sphere of mass 1.5 kg and diameter 30.0 cm starts from rest and rolls without slipping down a 35° incline that is 7.0 m long
(a) Calculate the linear speed of the center of the sphere when it reaches the bottom of the incline. (b) Determine the angular speed of the sphere about its center at the bottom of the incline. (c) Through what angle (in radians) does this sphere turn as it rolls down the incline? (d) Does the linear speed in (a) depend on the radius or mass of the sphere? Does the angular speed in (b) depend on the radius or mass of the sphere?
Displacement: Suppose that an object travels from one point in space to another. Make a comparison between the magnitude of the displacement and the distance traveled by this object.
A. The displacement is either greater than or equal to the distance traveled. B. The displacement is always equal to the distance traveled. C. The displacement is either less than or equal to the distance traveled. D. The displacement can be either greater than, smaller than, or equal to the distance traveled.
Which of the following substances is readily attracted to a magnet?
a. Gold b. Nickel c. Carbon d. Nitrogen