Young's Modulus: A wire of diameter 0.20 mm stretches by 0.20% when a 6.28-N force is applied to it. What is Young's modulus for this wire?
A. 2.5 × 1010 Pa
B. 1.0 × 1011 Pa
C. 2.5 × 1012 Pa
D. 1.0 × 1012 Pa
Answer: B
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A. 25.9 m/s B. 28.1 m/s C. 49.9 m/s D. 26.9 m/s E. 58.4 m/s
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a. 
b. 
c. 
d. 
e. 
A 5.0-m long, 12-kg, ladder rests against a smooth vertical wall with the bottom of the ladder 3.0 m from the wall. The coefficient of static friction between the floor and the ladder is 0.28
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