A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. S1 and S2 are in phase. The black circles are one and two wavelengths from their respective sources. The lighter circles are one-half and one-and-a-half wavelengths distant from their respective sources. If the waves shown
arriving at P1 both arrive with amplitude A, the resultant amplitude at point P1 is
?
?
a.
0.
b.
.
c.
A.
d.
e
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Why are Earth and other planets spherical while smaller bodies such as most asteroids are not?
A. The larger mass of a planet produces enough gravity to pull it into a round shape. B. It is the nature of massive objects to pull themselves into spherical shapes. C. Asteroids were never molten, and so never underwent differentiation. D. Earth and other planets formed from planetesimals pulled together by gravity into circular orbits. E. The atmosphere of a planet is heavy enough to push the planet into a round shape.
In the equation PV = NkT, the k is known as
A) Avogadro's number. B) Boltzmann's constant. C) Planck's constant. D) the spring (compressibility) constant. E) compressibility.
A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going upwards the velocity and acceleration both point up
a. True b. False Indicate whether the statement is true or false
A large cylindrical water tank is mounted on a platform with its central axis vertical. The water level is 3.75 m above the base of the tank, and base is 6.50 m above the ground. A small hole 2.22 mm in diameter has formed in the base of the tank
Both the hole and the top of the tank are open to the air. We can ignore air resistance and treat water as an ideal fluid with a density of 1000 kg/m3. (a) How many cubic meters of water per second is this tank losing? (b) How fast is the water from the hole moving just as it reaches the ground?