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
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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
A. 11.7 m/s B. 8.9 m/s C. 7.4 m/s D. 4.7 m/s E. Some other speed (specify)
The heaviest element produced by stars or in supernovae is silicon
Indicate whether the statement is true or false
The solution to a problem is the equation below. Which description best fits this solution?
?
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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.
A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm. He has heated the plate to 900 K
If the emissivity of the plate is 0.75, at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings. (? = 5.67 × 10-8 W/m2 ? K4 ) A) 850 W B) 790 W C) 760 W D) 880 W E) 360 W