The torque required to turn the crank on an ice cream maker is 4.50 Nm. How much work does it take to turn the crank through 300 full turns?
A) 4240 J
B) 8480 J
C) 2120 J
D) 1350 J
E) 2700 J
B
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A hockey puck slides off the edge of a horizontal platform with an initial velocity of 20 m/s horizontally. The effects of air are negligible. The height of the platform above the ground is 2.0 m
What is the magnitude of the vertical component of the velocity of the puck just before it hits the ground? A) 20 m/s B) 6.3 m/s C) 13 m/s D) 15 m/s E) 21 m/s
A positively charged ping pong ball is sitting stationary on the floor in the center of a room. There is also a constant, uniform magnetic field in the room that points toward the ceiling. If I now start the ball rolling toward the back of the room, the resultant motion of the ball, as observed from the ceiling, will be
A. a diagonal straight line toward the left back corner of the room. B. a straight line in the original direction of motion. C. a diagonal straight line toward the right back corner of the room. D. a horizontal, counterclockwise circle. E. a horizontal, clockwise circle.
If two stars have a magnitude difference of 5, what is their flux ratio?
a. 10.0 b. 12.6 c. 100.0 d. 250.0 e. 625.3
Refrigerator magnets are typically
A) short range. B) long range. C) none of these