Energy and Momentum: A baseball pitcher is employing a ballistic pendulum to determine the speed of his fastball. A 3.3-kg lump of clay is suspended from a cord 2.0 m long. When the pitcher throws his fastball aimed directly at the clay, the ball suddenly becomes embedded in the clay and the two swing up to a maximum height of 0.080 m. If the mass of the baseball is 0.21 kg, find the speed of the pitched ball.
Fill in the blank(s) with the appropriate word(s).
21 m/s
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An object is placed 12 cm in front of a curved mirror. The magnification of the image is -3.0. What is the focal length of the mirror?
A) 12 cm B) 9.0 cm C) 24 cm D) 36 cm E) 16 cm
A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 rad/sec2 acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the centripetal acceleration of a point 4.0 cm from the center at the time 10.0 seconds from the start?
A. 2.0 
B. 1.8
C. 1.0
D. 0.9
E. 0.6
Determining answers to questions to determine your audience's wants and expectations is part of conducting a(n) ______.
A. needs assessment B. target audience profile C. ROI D. CTA
When a rocket ship gaining speed in outer space runs out of fuel, it
A) gains speed for a short time, then slows down to a constant velocity. B) gains speed for a short time, slows down, and eventually stops. C) no longer gains speed.