A constant magnetic field is applied perpendicular to the plane of a square, single-turn coil with each side equal to 15 cm. If the area of the coil decreases at a rate of 0.20 m2/s, an emf of 20 mV is induced in that coil
What is the strength of the magnetic field applied to the coil? A) 0.10 T
B) 0.20 T
C) 0.30 T
D) 0.40 T
E) 0.50 T
A
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A uniform rod of length L and weight W is placed on a fulcrum a distance of 0.4L from the left end. On the left end is placed a mass of weight 2W and on the right end a vertical force F is applied to keep the system in balance. What are the magnitude and direction of the force F?
a. 7/6 W up b. 4/3 W down c. 7/6 W down d. 4/3 W Up
Which is farthest?
a) a galaxy with a recessional velocity of 100000 km/s b) the most distant star in our Galaxy c) a quasar with a recessional velocity of 50000 km/s d) a galaxy with a recessional velocity of 20000 km/s e) a quasar with a recessional velocity of 10000 km/s
Rotation curves for spiral galaxies show:
A) they are slowing down. B) rotation speed drops off further from the nucleus. C) most have dark halos. D) most of the mass lies in the nucleus. E) no relation to mass.
Which of the following would not be considered evidence for dark matter in clusters of galaxies?
A) the total amount of stars B) the temperature of the intergalactic gas C) the velocities and radii of galaxy orbits around the center of mass in the cluster D) the curvature of gravitationally-lensed galaxies