The number of turns in the coil of a generator is reduced by a factor of 2 and at the same time it is rotated twice as fast keeping other factors constant. What happens to the value of the maximum induced emf?
A) It is reduced by a factor of 2.
B) It is reduced by a factor of 4.
C) It is doubled.
D) It stays the same.
E) It is quadrupled.
D
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A ball is projected upward at time t = 0 s, from a point on a flat roof 90 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground. The initial velocity of the ball is 80.5 m/s
Consider all quantities as positive in the upward direction. The vertical velocity of the ball when it is above the ground is closest to A) -81 m/s. B) -64 m/s. C) -48 m/s. D) -32 m/s. E) -97 m/s.
Impulse: A very light ping-pong ball moving east at a speed of 4 m/s collides with a very heavy stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?
A. Neither; both experienced the same magnitude impulse. B. the Ping-Pong ball C. the bowling ball D. It is impossible to tell since the actual mass values are not given. E. It is impossible to tell since the velocities after the collision are unknown.
Induced emf in a straight segment of wire that passes through a magnetic field depends on all of the following, except:
A. the orientation of the wire with respect to the magnetic field direction B. its length, its resistance C. its speed D. the magnetic field strength
Wien's Law: As the temperature of a blackbody increases, what happens to the peak wavelength of the light it radiates?
A. It gets longer. B. It gets shorter. C. The wavelength is not affected by the temperature of the object.