Newton's Cradle consists of an aligned row of identical elastic balls suspended by strings so they barely touch one another. When two balls are raised from one end and released, they strike the row and two balls pop out from the other end
If instead, one ball popped out with twice the speed of the two, this would violate
A) momentum conservation.
B) energy conservation.
C) both of these
D) none of these
Answer: B
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a. 27.3 N b. 33.0 N c. 31.1 N d. 0.367 N e. 1.10 N
About how many times larger in diameter is a 
nucleus than an 
nucleus?
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A wire along the z-axis carries a current of 6.8 A in the +z direction. Find the magnitude and direction of the force exerted on a 6.1-cm long length of the wire by a uniform magnetic field with magnitude 0.36 T in the -x direction
What will be an ideal response?