If you drop a bar magnet in a vertical copper pipe it will fall slowly because
A) of air resistance.
B) it induces a magnetic field in the pipe that resists motion of the magnet.
C) the copper is a good conductor of both electricity and magnetism.
D) of electron repulsion.
Answer: B
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Molecular clouds can be observed
a. using infrared telescopes to detect ionized gas in the clouds. b. using x-ray telescope to observe the x-ray radiation from the molecules in the cloud. c. using radio telescopes to observe the CO emission from the clouds. d. by looking for blue wispy regions near star clusters. e. by looking for the 21-cm radiation from hydrogen.
Three forces are exerted on an object and as a result the object moves with a constant velocity. One force is 60.0 N along the +x-axis, and the second is 75.0 N along the +y-axis. What is the magnitude of the third force?
A) 135 N B) 15.0 N C) 48.0 N D) 67.5 N E) 96.0 N
A 12-g bullet moving horizontally strikes and remains in a 3.0-kg block initially at rest on the edge of a table. The block, which is initially 80 cm above the floor, strikes the floor a horizontal distance of 120 cm from its initial position. What was the initial speed of the bullet?
a. 0.68 km/s b. 0.75 km/s c. 0.81 km/s d. 0.87 km/s e. 0.41 km/s
The maximum acceleration a pilot can stand without blacking out is about 7.0 g. In an endurance test for a jet plane's pilot, what is the maximum speed he can tolerate if he is spun in a horizontal circle of diameter 85 m?
What will be an ideal response?