Angular Momentum: A solid wooden door, 90 cm wide by 2.0 m tall, has a mass of 35 kg. It is open and at rest. A small 500-g ball is thrown perpendicular to the door with a speed of 20 m/s and hits the door 60 cm from the hinged side, causing it to begin turning. The ball rebounds along the same line with a speed of 16.0 m/s relative to the ground. How much energy is lost during this collision?
A. 30 J
B. 16 J
C. 15 J
D. 13 J
E. 4.8 J
Answer: A
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Two identical springs with spring constant 50 N/m support a 5.0-N weight as in the picture below. What is the tension in spring A?
?
?
a.
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b.
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c.
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d.
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e.
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