Two lamps with different filament thicknesses, and therefore different resistances, are connected in series. Greater current is in the lamp with the
A) thick filament.
B) thin filament.
C) same in each
Answer: C
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Answer the following statement(s) true (T) or false (F)
1. In a maximally efficient heat engine, the amount of entropy that the hot reservoir loses as heat flows out of it is exactly balanced by the entropy that the cold reservoir gains as the waste heat flows into it.
Joe and Bill throw identical balls vertically upward. Joe throws his ball with an initial speed twice as high as Bill. If there is no air resistance, the maximum height of Joe's ball will be
A) four times that of Bill's ball. B) two times that of Bill's ball. C) equal to that of Bill's ball. D) eight times that of Bill's ball. E) roughly 1.4 times that of Bill's ball.
A boy releases his 2.0 kg toy, from rest, at the top of a sliding-pond inclined at 20° above the horizontal. What will the toy's speed be after sliding 4.0 m along the sliding-pond? The coefficient of kinetic friction is 0.20
A) 3.0 m/s B) 4.4 m/s C) 2.2 m/s D) 5.2 m/s E) 3.5 m/s
The diagram shown represents a portion of a wire in a circuit. A current is flowing in the wire in the direction shown. Under the convention that it is positive charge that flows the electric field points in the direction of the current. How can the electric field change direction where the wire bends?
a.
There is an excess of negative charge in the center of the wire.
b.
There is an excess of positive charge at the bottom end of the wire.
c.
There is an excess of negative charge at the right end of the upper portion of the wire.
d.
There is an accumulation of positive charge on the surface, particularly at the bend, such that the sum of electric fields gives the new electric field.
e.
There is an accumulation of electrical potential as the current traverses the wire: The higher potential in the lower half is the source of the field.