A resistor and an inductor are connected in series to a battery. The battery is suddenly removed from the circuit and replaced by a wire to complete the circuit
The time constant for of the new circuit represents the time required for the current to decrease to
A) 75% of the original value.
B) 25% of the original value.
C) 63% of the original value.
D) 37% of the original value.
E) zero.
D
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If an elephant grows proportionally to twice its height, the area of its ears would be about
A) twice. B) four times more. C) six times more. D) eight times more. E) none of the above
A certain photon after being scattered from a free electron at rest moves at an angle of 120° with respect to the incident direction. If the wavelength of the incident photon is 0.591 nm, what is the wavelength of the scattered photon?
A) 0.380 nm B) 0 nm C) 0.550 nm D) 0.591 nm E) 0.595 nm
The Leaning Tower of Pisa is 55 m tall and about 7.0 m in diameter. The top is 4.5 m off center. How much farther can it lean before it becomes unstable?
A) 0.5 m B) 1.5 m C) 2.5 m D) 3.5 m E) 4.5 m
The figure below shows a planet traveling in a clockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
A. its speed is constant. B. its speed is increasing. C. its speed is decreasing. D. its speed is a maximum. E. its speed is a minimum.