A batter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. The ball remains in contact with the bat for 2.0 ms
What is the magnitude of the average force exerted by the bat on the ball?
4900 N
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The process of injecting a thermoset polymer into a hot die is called ___________ molding.
Fill in the blank(s) with the appropriate word(s).
To open a very heavy door, the best place to push the door is:
a. half way between the doorknob and the hinge. b. at the end of the door where the doorknob is located. c. torque, not force, is what matters. Hence, it makes no difference where the force is applied. d. near the bottom of the door. e. close to the hinges.
The change in internal energy of adding 100 joules to a system that does 60 joules of work is
A) 0 J. B) 40 J. C) 60 J. D) 100 J. E) none of the above
If one lawn mower causes an 80 dB sound level at a point nearby, four lawnmowers together would cause a sound level of ____________ at that point
a. 92 dB c. 86 dB b. 84 dB d. none of the above