The variation in the pressure of helium gas, measured from its equilibrium value, is given by ?P = 2.9 × 10^?5 cos (6.20x ? 3 000t) where x and t have units m and s, and ?P is measured in N/m2 . Determine the frequency (in Hz) of the wave
a. 1 500
b. 477
c. 1.01
d. 0.32
e. 239
b
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The support force on a 30-kg dog sleeping on the floor is
A) less than 300 N. B) about 300 N. C) more than 300 N. D) nonexistent while asleep.
Why do asteroids and comets differ in composition?
A) Asteroids formed inside the frost line, while comets formed outside. B) Asteroids and comets formed at different times. C) Comets formed from the jovian nebula, while asteroids did not. D) Comets are much larger than asteroids. E) Asteroids are much larger than comets.
The density of an object is defined as
A. the volume occupied by each unit of mass. B. the amount of mass for each unit of volume. C. the weight of each unit of volume. D. the amount of the substance that has unit volume and unit mass. E. the amount of the substance that contains as many particles as 12 grams of the carbon-12 isotope.
According to Newton's Third Law, "action" and "reaction" forces must always act on the same object
Indicate whether the statement is true or false