If the control volume equation for a flow is the equation below, the flow may be:
(A) Uniform flow into and from a fixed volume
(B) Steady, uniform flow in a pipe
(C) Uniform flow in a conduit
(D) Steady, one-dimensional flow in a channel
(B) Steady, uniform flow in a pipe
The flow must be steady, so that leaves either (B) or (D). It must also be uniform so the variables can be removed from inside the integral.
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Answer the following statement(s) true (T) or false (F)
1. The sun’s mass is about 1000 times that of Jupiter, and the radius of Jupiter’s orbit is about 1100 times the sun’s radius. The center of mass of the sun/Jupiter system is inside the sun. 2. Two stars, one with radius r and the other with radius 3r, orbit each other so that their centers of mass are 25r apart. Assume that the stars have the same uniform density. This system’s center of mass is inside the larger star. 3. Kepler’s 2nd law applies to hyperbolic orbits. 4. Kepler’s 3rd law applies to hyperbolic orbits.
Dipole-induced dipole forces of attraction exist between water and gasoline, and yet these two substances do not mix because water has such a strong attraction for itself
Which of the following compounds might best help to make these two substances mix into a single liquid phase? A) the molecule on the far left because the O-H bond is polar and the carbon and hydrogen bonds are nonpolar B) the molecule in the middle because when the salts mix into the water, it will help separate the water and decrease the attraction for itself C) The molecule on the right will form attractions with the polar ends of the water, allowing the gasoline a chance to mix with the water. D) All of these molecules would be equally effective at increasing the mixing of gasoline and water.
When you touch a cold piece of ice with your finger, energy flows
A) from your finger to the ice. B) from the ice to your finger. C) actually, both ways.
Scientific Notation: What is the result of the calculation (0.410 + 0.021) × (2.20 × 103)?
A. 880 B. 946 C. 948 D. 950