According to the principle of continuity, the velocity of a fluid multiplied by the cross-sectional area through which it flows at one point will equal the product of
A) velocity and cross-sectional area at another point.
B) velocity and pressure at another point.
C) a constraint factor.
D) none of the above
Answer: A
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An acceleration is evidence of ______________
Fill in the blank(s) with correct word
A solid rock, suspended in air by a spring scale, has a measured mass of 9.00 kg. When the rock is submerged in water, the scale reads 6.43 kg. What is the density of the rock? (water density = 1000 kg/m3)
a. 1.40 × 10^3 kg/m3 c. 1.84 × 10^3 kg/m3 b. 3.50 × 10^3 kg/m3 d. 1.58 × 10^3 kg/m3
According to Newton, the greater the distance between gravitationally interacting objects, the
A) less the gravitational force between them. B) more the gravitational force between them. C) constancy of the force between them.
How do asteroids differ from comets?
A) Asteroids are rocky bodies and are denser than the comets, which are made of icy material. B) Asteroids are rocky bodies and are less dense than the comets, which are made of icy material. C) Asteroids are made of icy material and are denser than the comets, which are more rocky. D) Asteroids are made of icy material and are less dense than the comets, which are rockier. E) Asteroids and comets are both made of rocky and icy material, but asteroids are smaller in size than comets.