A single circular (radius = R) loop of wire is located in the yz plane with its center at the origin. The loop has a clockwise current as seen from the point (+R, 0, 0). The direction of the magnetic field at the point
a. (0, 0, 0) is ?i and at the point (+R, 0, 0) is ?i.
b. (0, 0, 0) is ?i and at the point (0, +2R, 0) is ?i.
c. (0, 0, 0) is +i and at the point (+R, 0, 0) is +i.
d. (0, 0, 0) is +i and at the point (0, +2R, 0) is +i.
e. None of the above
a
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Because Earth's axis of rotation is inclined 23.4 degrees from vertical, the Sun moves into the northern sky in the spring and into the southern sky in the fall
a. True b. False Indicate whether the statement is true or false
Exhibit 13-1
Two blocks of masses m1 and m2 are connected by a light cord that passes over a pulley of mass M, as shown. Block m2 slides on a frictionless horizontal surface. The blocks and pulley are initially at rest. When m1 is released, the blocks accelerate and the pulley rotates.
?
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Use this exhibit to answer the following question(s).
Refer to . The total angular momentum of the system of the two blocks and the pulley relative to the axis of rotation of the pulley is
a.
proportional to the radius of the pulley.
b.
proportional to the speed of the blocks.
c.
proportional to the length of the string.
d.
to all of the above.
e.
only to (a) and (b) above.
When are Mercury and Venus easiest to observe from Earth? Why? How much of then can we see at that time?
What will be an ideal response?
A temperature change from 35°C to 55°C corresponds to what incremental change in °F?
a. 20 b. 95 c. 36 d. 131 e. 68