Intensity of Sound: A long-term exposure to the sound of a riveting machine can cause your threshold of hearing to shift from 0 dB to 30 dB. What is the sound intensity of a 30-dB sound? The normal lowest detectable intensity is 1.0 × 10-12 W/m2.
Fill in the blank(s) with the appropriate word(s).
1.0 × 10-9 W/m2
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Order the following from most recent to least. I. Big Bang II. Age of quasars III. First humans IV. Cambrian explosion V. Formation of the solar system VI. First life VII. Recombination Period
a. I, II, VII, IV, V, VI, III b. I, VI, VII, II, V, IV, III c. I, VI, V, VII, III, II, IV d. I, VII, II, V, VI, IV, III
Newton's Second Law in 2 Dimensions: Two forces act on a 55-kg object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?
A. 1.1 m/s2 B. 1.3 m/s2 C. 1.5 m/s2 D. 1.7 m/s2
The Roche limit is the point at which
A) the mass of an object classifies it as a moon. B) a moon orbiting a planet experiences synchronous rotation. C) the external tidal forces on an object are strong enough to be felt by the object. D) the external tidal forces on an object become greater than the internal forces that hold it together. E) the internal forces that hold an object together weaken so that the object falls apart.
A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is 10 m/s2
a. True b. False Indicate whether the statement is true or false