An ideal ammeter should
A) have a high coil resistance.
B) introduce a very small series resistance into the circuit whose current is to be measured.
C) introduce a very large series resistance into the circuit whose current is to be measured.
D) consist of a galvanometer in series with a large resistor.
B
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A cart starting from rest rolls down a hill and at the bottom has a speed of 4 m/s. If the cart were given an initial push, so its initial speed at the top of the hill was 3 m/s, what would be its speed at the bottom?
a) 4 m/s b) 5 m/s c) 6 m/s d) 7 m/s e) 25 m/s
Two identical containers, A and B, hold equal amounts of the same ideal gas at the same Po, Vo and To. The pressure of A then decreases by a half while its volume doubles; the pressure of B doubles while its volume decreases by a half. Which statement correctly describes the temperatures of the gases after the changes?
A. TA = 0.5TB = To. B. TB = 0.5TA = To. C. TB = TA = To. D. TA = 2TB = To. E. TB = 2TA = To.
A 10-m plank with a mass of 80 kg is being moved by rolling it over two cylindrical logs, each with a mass of 10 kg and a radius of 20 cm, placed 2 m from either end of the plank
As the plank is pushed, the logs roll on the ground without slipping, and the plank does not slip on the rollers. A force of 250 N is applied to the plank. What is the speed of the plank after it has moved 2 m, starting from rest? A) 1.87 m/s B) 2.53 m/s C) 3.43 m/s D) 3.54 m/s E) 2.37 m/s
The term "relativistic" refers to effects that are
A. measured by stationary observers only. B. observed when speeds are near the speed of light. C. observed when objects move backward in time. D. noticed about a moving object.