Tensile Stress and Strain: A 25-kg piece of equipment can be hung by steel wires of length 1.00 m, 2.00 m, or 3.00 m. If all the wires have the same diameter, which one will stretch the greatest percent?
A. the 1.00-m wire
B. the 2.00-m wire
C. the 3.00-m wire
D. They will all stretch by the same percent.
Answer: D
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A. 0.80 × 10-4 ? ? m B. 8.0 × 10-4 ? ? m C. 0.80 × 10-5 ? ? m D. 0.80 × 10-6 ? ? m E. 8.0 × 10-6 ?v
A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz
(a) What is the maximum speed of the needle? (b) What is the maximum acceleration of the needle? What will be an ideal response?
Because of its axial tilt and more elliptical orbit, Mars' polar caps change size even more than the Earth's do
Indicate whether the statement is true or false
A meteor having a mass of 1000 kg moves through outer space, far from all planets and stars and far from all gravitational influences, at a speed of 20 km/s (20,000 m/s). How much work is done on the meteor during a time interval of one second?
A) 20 × 106 J B) 20 J C) 1000 J D) 20 000 J E) None of the above.