A 125 g pendulum bob hung on a string of length 35 cm has the same period as when the bob is hung from a spring and caused to oscillate. What is the spring’s elastic constant?
A. 1.9 N/m
B. 3.5 N/m
C. 5.2 N/m
D. 27 N/m
B. 3.5 N/m
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From lowest frequency to highest frequency, which of the following correctly orders the different regions of electromagnetic radiation?
A) infrared, visible light, ultraviolet, x-rays, gamma rays, radio B) radio, infrared, visible light, ultraviolet, x-rays, gamma rays C) visible light, infrared, x-rays, ultraviolet, gamma rays, radio D) gamma rays, x-rays, visible light, ultraviolet, infrared, radio E) Radio, x-rays, visible light, ultraviolet, infrared, gamma rays
Two charged particles repel each other with a force F. If the charge of one of the particles is doubled and the distance between them is also doubled, then the force will be
A) F. B) 2 F. C) F/2. D) F/4. E) none of the above
A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
a. 8.2 m b. 15.8 m c. 13.5 m d. 11.0 m e. 4.9 m
Briefly explain the meaning of each term in the equation Number of Civilizations = Np × flife × fcivilization × fnow
What will be an ideal response?