What is the mass number of alpha particles?
A) 1
B) 2
C) 3
D) 4
E) 6
D
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A wire loop of radius 0.250 m is placed in a uniform magnetic field of magnitude 0.740 T. The field is directed perpendicular to the plane of the loop. If the field reverses its direction, and its magnitude changes to 0.100 T in time 1.06 s, what is the magnitude of the average induced emf in the loop during this time?
a. 156 mV b. 119 mV c. 185 mV d. 741 mV
A miniature spring-loaded, radio-controlled gun is mounted on an air puck. The gun's bullet has a mass of 7.00 g, and the gun and puck have a combined mass of 150 g. With the system initially at rest, the radio controlled trigger releases the bullet causing the puck and empty gun to move with a speed of 0.530 m/s. What is the bullet's speed?
a. 83.2 m/s b. 75.7 m/s c. 12.4 m/s d. 11.4 m/s e. 296 m/s
A coil with a self-inductance of 6 H has a constant current of 2 A flowing through it for 2 seconds. What is the emf induced in this coil?
A) 6 V B) 12 V C) 0 V D) 4 V E) 8 V
Length Contraction: An astronaut is resting on a bed inclined at an angle above the floor of a spaceship, as shown in the figure. From the point of view of an observer who sees the spaceship moving near the speed of light parallel to the floor, the angle the bed makes with the floor
A. is greater than the angle observed by the astronaut. B. is the same as the angle observed by the astronaut. C. is smaller than the angle observed by the astronaut. D. could be greater or smaller than the angle observed by the astronaut depending on whether the rocket is moving to the right or to the left.