A batter hits a 0.140-kg baseball that was approaching him at 30.0 m/s and, as a result, the ball leaves the bat at 40.0 m/s in the direction of the pitcher. The ball remains in contact with the bat for 2.0 ms
What is the average force exerted by the bat?
4900 N
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A +7.5-nC point charge is 5.0 cm from a -9.4-µC point charge in your laboratory in California
How much work would you have to do if you left the +7.5-nC charge in the lab but took the -9.4-µC charge to New York City? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
Consider the decay ?o ? ?- + e+. This decay is
A) forbidden because conservation of baryon number is violated. B) forbidden because conservation of lepton numbers is violated. C) allowed. D) forbidden because conservation of mass is violated. E) forbidden because conservation of energy is violated.
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Answer the following statement true (T) or false (F)
A freight car rolls along a horizontal track at 12 m/s and hooks onto an identical freight car at rest. The coupled cars will
1) come to a quick stop, 2) roll at 3 m/s, 3) roll at 6 mph, 4) roll at 12 ms, which makes sense because 5) in the absence of external forces, trains in motion continue in motion. 6) the acceleration of the car at rest equals the force of impact divided by the two masses. 7) since twice the mass is moving, the speed will be half for the same momentum. 8) energies before and after the collision remain the same.