By what factor should the length of simple pendulum be changed in order to triple the period of vibrations?

a. 3
b. 6
c. 9
d. 1/3


Ans: c. 9

Physics & Space Science

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A blimp has a velocity of 8.2 m/s due west relative to the air. There is a wind blowing at 3.5 m/s due north. The speed of the balloon relative to the ground is

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The heaviest element produced by stars or in supernovae is silicon

Indicate whether the statement is true or false

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A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K

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The solution to a problem is the equation below. Which description best fits this solution? ?           ?

A. A vertical spring compressed 0.120 m shoots a 2.00-kg mass 2.90 cm above the equilibrium position of the spring. B. A vertical spring stretched 0.120 m shoots a 2.00-kg mass 9.10 cm above the equilibrium position of the spring. C. A vertical spring compressed 0.120 m shoots a 2.00-kg mass 12.0 cm above the equilibrium position of the spring. D. A vertical spring compressed 0.120 m shoots a 2.00-kg mass 14.9 cm above the equilibrium position of the spring. E. A 2.00-kg mass has fallen 0.820 m and compressed the upper end of a vertical spring 12.0 cm below the equilibrium position.

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