The frequency with which a magnet plunges into and out of a wire coil equals the frequency of the induced
A) voltage.
B) current.
C) both of these
D) none of the above
Answer: C
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The Earth's gravity exerts no torque on a satellite orbiting the Earth in an elliptical orbit. Compare the motion of the satellite at the point nearest the Earth (perigee) to the motion at the point farthest from the Earth (apogee). At these two points:
a. the tangential velocities are the same. c. the angular momenta are the same. b. the angular velocities are the same. d. the kinetic energies are the same.
Three boxes rest side-by-side on a smooth, horizontal floor. Their masses are 5.0 kg, 3.0 kg, and 2.0 kg, with the 3.0-kg mass in the center. A force of 50 N pushes on the 2.0-kg mass, which pushes against the other two masses
What is the contact force between the 5.0-kg mass and the 3.0-kg mass? A) 0 N B) 10 N C) 25 N D) 40 N E) 50 N
The force on a charged object divided by the charge on the object is __________
Fill in the blank(s) with correct word
Jennifer bungee-jumps from a bridge (event A). Jennifer’s bungee cord is perfectly elastic, so she bounces exactly back up to the bridge and lands on her feet (event B). The time between these events is measured by Jennifer’s watch, a stopwatch held by Jennifer’s friend, Rob, who is standing on the bridge, and by two passengers (one present at event A and one present at event B) who are riding on a train traveling at a constant velocity across the bridge at the time (the passengers have synchronized watches and compare readings later). Assuming the earth’s frame is inertial, who measures
(a) the longest time interval between these events? A. Jennifer B. Rob C. The train passengers