An athlete stretches a spring an extra 40.0 cm beyond its initial length. How much energy has he transferred to the spring, if the spring constant is 52.9 N/cm?
A) 423 J B) 423 kJ C) 4230 kJ D) 4230 J
A
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Acceleration: An object moving in the +x direction experiences an acceleration of +2.0 m/s2. This means the object
A. travels 2.0 m in every second. B. is traveling at 2.0 m/s. C. is decreasing its velocity by 2.0 m/s every second. D. is increasing its velocity by 2.0 m/s every second.
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What will be an ideal response?
Which of the following telescopes must be used above Earth's atmosphere?
a. an optical telescope b. the VLBI telescope c. an x-ray telescope d. a radio telescope e. none of the above
A transverse periodic wave is represented by the equation z(y, t) = 1.50 cm sin(1,250 rad/s t + 10.0
What is the direction of the velocity of the wave?
A. the x direction B. the y direction C. the z direction D. the t direction