Impulse: A 475-gram ball is traveling horizontally at 12.0 m/s to the left when it is suddenly struck horizontally by a bat, causing it to reverse direction and initially travel at 8.50 m/s to the right. If the bat produced an average force of 1275 N on the ball, for how long (in milliseconds) was it in contact with the ball?
Fill in the blank(s) with the appropriate word(s).
7.64 ms
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Solenoid: An ideal solenoid that is 34.0 cm long is carrying a current of 2.00 A. If the magnitude of the magnetic field generated at the center of the solenoid is 9.00 mT, how many turns of wire does this solenoid contain? (?0 = 4? × 10-7 T ? m/A)
A. 860 B. 1590 C. 2320 D. 3180 E. 1220
A long solenoid produces a field at its center. An identical solenoid is placed end to end with the first (common axis). The magnetic field at the center of the 1st solenoid is now
A) zero. B) the same. C) double. D) four times the original magnitude. E) half what it was.
An image seen projected on a screen by a single lens
a. is always erect. b. is always inverted. c. is a real image. d. is a virtual image. e. none of the above
A vertical tube one meter long is open at the top. It is filled with 75 cm of water. If the velocity of sound is 344 m/s, what will the fundamental resonant frequency be (in Hz)?
a. 3.4 b. 172 c. 344 d. 1.7 e. 688