Impulse: A girl of mass 55 kg throws a ball of mass 0.80 kg against a wall. The ball strikes the wall horizontally with a speed of 25 m/s, and it bounces back with this same speed. The ball is in contact with the wall 0.050 s. What is the magnitude of the average force exerted on the wall by the ball?
A. 800 N
B. 400 N
C. 55,000 N
D. 27,500 N
E. 13,750 N
Answer: A
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A) aren't massive enough. B) are too heavy. C) ride on straight tracks. D) encounter opposing forces.
A vector has components Ay = 12 m and Ay = 5.0 m. What is the magnitude of vector?
A) 7.0 m B) 13 m C) 17 m D) 21 m E) 60 m
A copper ball with a diameter of 5.00 cm is subjected to a pressure of 
The bulk modulus for copper is 
What is the bulk strain?
A. 
B. 
C. 
D. 
E. 
The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
a.
E.
b.
F.
c.
G.
d.
H.
e.
A.