Which of the following is true for an oscillating spring?
1.The kinetic energy is greatest when the spring is the most compressed and the most extended.
2.The potential energy is greatest when the spring is the most compressed and the most extended.
3.The total energy is greatest when the spring is the most compressed and the most extended.
4.None of these.
2
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A solid shaft of 1020 steel with an outside radius of 1.002 cm is to be inserted inside a hollow 1020 steel shaft with an inside radius of 1.000 cm. This is to be accomplished by heating the hollow shaft sufficiently so that the solid shaft can be inserted into the hollow shaft with a radial clearance of 0.002 cm. When the two shafts are brought to room temperature, they will be bonded together as a single unit. This process is called a shrink fit. To what temperature must the hollow shaft be heated for this process, assuming that the solid shaft is at 300 K?
What will be an ideal response?
The energy of a photon is related to
A) the energy given to the atom that emits it. B) the energy transition in de-excitation. C) its frequency. D) all of the above E) none of the above
A baseball player is running to second base at 5.03 m/s. When he is 4.80 m from the plate he goes into a slide. The coefficient of kinetic friction between the player and the ground is 0.180. What is his speed when he reaches the plate?
A) 4.47 m/s B) 2.89 m/s C) 1.96 m/s D) 2.56 m/s E) He stops before reaching the plate.
The Greeks abandoned their earliest cosmological theory (planets moving in simple circles around Earth) because
A) it did not agree with their observations of the planets. B) it seemed messy and unsatisfying. C) they came to believe that Earth should be at the center of things. D) they came to believe that the sun should be at the center of things. E) Actually, they never did abandon or revise their earliest theory--it was not altered until the time of Copernicus.