The physical properties of a regular copolymer are normally a weighted _____________of the physical properties of the component polymers.
Fill in the blank(s) with the appropriate word(s).
average
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A 140 gm baseball with a velocity of 25.0 m/s is hit by a baseball bat and leaves at 30.0 m/s in the opposite direction. If the ball was in contact with the bat for 12.0 ms, what is the average force on the ball?
A. 750 N B. 642 N C. 550 N D. 482 N E. 366 N
Stars continue to form in the halo of our Galaxy today
Indicate whether the statement is true or false
The core of the reactor at Three Mile Island
A) never had a significant chance of a meltdown. B) came within a day of a melt-down. C) came within seconds of a melt-down. D) came within an hour of a melt-down. E) melted down.
A child runs at 3.0 m/s and jumps onto a sled, initially at rest. If the child's mass is 36 kg, and if the child and sled slide off together at 2.0 m/s after the collision, the sled's mass is
A. 48 kg. B. 18 kg. C. 12 kg. D. 36 kg.