By what factor is the self-inductance of an air solenoid changed if its length and number of coil turns are both multiplied by seven?
a. 1/7
b. 7
c. 1
d. 49
e. 1/49
b
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Mort, who is standing on the ground, throws a ball at 20 m/s eastward as measured by him. What is the ball's velocity relative to Velma, who is in a train moving eastward past Mort at 70 m/s?
A) 50 m/s eastward B) 90 m/s eastward C) 50 m/s westward D) 90 m/s westward E) 70 m/s westward
The ________ focus reflector needs only a single optical surface to form images
Fill in the blank(s) with correct word
You are holding on to one end of a long string that is fastened to a rigid steel light pole. After producing a wave pulse that was 5 mm high and 4 cm wide, you want to produce a pulse that is 4 cm wide but 7 mm high. You must move your hand up and down once,
a. the same distance up as before, but take a shorter time. b. the same distance up as before, but take a longer time. c. a smaller distance up, but take a shorter time. d. a greater distance up, but take a longer time. e. a greater distance up, but take the same time.
What was the Maunder Minimum?
What will be an ideal response?