Two tuning forks produce sounds of wavelengths 3.4 m and 3.3 m. Assuming the speed of sound is 340 m/s, the beat frequency produced is
A) 0.1 Hz.
B) 1.0 Hz.
C) 2.0 Hz.
D) 3.0 Hz.
E) 4.0 Hz.
Answer: D
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An athlete competing in the long jump leaves the ground with a speed of 9.14 m/s at an angle of 35° above the horizontal. How long does the athlete stay in the air, assuming no effects of air?
A) 0.50 s B) 0.88 s C) 1.1 s D) 2.5 s E) 0.54 s
A single brick falls with acceleration g. The reason a double brick falls with the same acceleration is
A) that in free fall all accelerations are g. B) its ratio of force to mass is the same. C) an experimental fact tested many times. D) none of the above
Mantle material behaves like a gas
a. True b. False Indicate whether the statement is true or false
Significant Figures: The length and width of a rectangle are 1.125 m and 0.606 m, respectively. You calculate the rectangle's perimeter by adding these numbers and multiplying by two. Your calculator's display reads 3.462. To the correct number of significant figures, the perimeter should be written as
A. 3.5 m. B. 3.46 m. C. 3.462 m. D. 3.4620 m.