A ten loop coil of area 0.23 m2 is in a 0.047 T uniform magnetic field oriented so that the maximum flux goes through the coil. The coil is then rotated so that the flux through it goes to zero in 0.34 s
The average emf induced in the coil during the 0.34 s is A)
3.2 × 10-3 V.
B)
0.
C)
3.2 × 10-2 V.
D)
3.2 × 10-1 V.
E)
1.0 V.
D
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A 1500 kg car accelerates from rest to 35 m/s in 6.5 s. If its engine and tires are able to provide a force to the car of 8500 N, what was the magnitude of the sum of forces due to friction and air resistance on the car during this interval?
A. 11450 N B. 1840 N C. 3510 N D. 3150 N
The acceleration of gravity on the moon is only one-sixth of that on Earth. If you hit a baseball on the moon with the same effort (and at the speed and angle) that you would on Earth, the ball would travel
A) one-sixth as far. B) 36 times as far. C) the same distance away. D) 6 times as far. E) as far.
Sputnik I was launched into orbit around Earth in 1957. It had a perigee (the closest approach to Earth, measured from Earth's center) of 6.81 × 106 m and an apogee (the furthest point from Earth's center) of 7.53 × 106 m
What was its speed when it was at its perigee? The mass of Earth is 5.97 × 1024 kg and G = 6.67 × 10-11 N ? m2/kg2. A) 7180 m/s B) 7840 m/s C) 8230 m/s D) 11,000 m/s E) 13,400 m/s
What is a new moon?
a. The lunar phase in which the first quarter Moon approaches full moon b. The lunar phase in which Earth's shadow is cast on the Moon c. The lunar phase in which the Moon's shadow is cast on Earth d. The lunar phase in which sunlight illuminates only the far side of the Moon e. The lunar phase in which sunlight illuminates the Earth facing side of the Moon