A steel guitar string with a diameter of 0.300 mm and a length of 70.0 cm is stretched by 0.500 mm while being tuned. How much force is needed to stretch the string by this amount? Young's modulus for steel is 2.0 × 1011 N/m2
What will be an ideal response?
10.1 N
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Concrete has a tensile strength of 3×106 Pa and an elastic modulus of 30×109 Pa. Because the concrete fractures in a brittle manner, it is to be reinforced with 10 vol % uniaxial 1020 steel rebar that has a yield strength of 205×106 Pa, and the steel rods have an elastic modulus of 211×109 Pa.
(a) What is the maximum strain that this composite can withstand without the concrete cracking or the rebar yielding? (b) What is the maximum tensile stress applied parallel to the rebar axis that can be withstood by this reinforced concrete before the concrete cracks or the rebar yields? Assume that there is good bonding between the concrete and the rebar.
Which of the following energy forms is stored in any compressed or stretched object?
a. nonmechanical energy b. elastic potential energy c. gravitational potential energy d. kinetic energy
A player catches a ball. Consider the action force to be the ball against the player's glove. The reaction is the
A) player's grip on the glove. B) force of the glove on the ball. C) friction of the ground against the player's shoes. D) muscular effort in the player's arms. E) none of the above
Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it is. Assume a cylindrical bottle has an inner radius of 1.0 cm and an outer radius of 2.0 cm. How thick (in cm) would the wall appear if you could see a mark on the inside surface?
a. 0.80 b. 0.51 c. 0.72 d. 80 e. 12