In general, what happens to the density and temperature of a gas as it expands?
A) It gets less dense and cooler.
B) It gets denser and cooler.
C) It gets less dense and hotter.
D) It gets denser and hotter.
A) It gets less dense and cooler.
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A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A 140-N force is applied to the box. What is the frictional force on the box?
What will be an ideal response?
There is a hollow, conducting, uncharged sphere with a negative charge inside the sphere. Consider the electrical potential at the inner and outer surfaces of the sphere. Which of the following is true?
a.
The potential on the inner surface is greater.
b.
The potential on the outer surface is greater.
c.
The potentials on both surfaces are zero.
d.
The potentials on both surfaces are equal but not zero.
If H equals 50 km/sec/Mpc, then a galaxy with a radial velocity of 50,000 km/sec will have a distance of about 1 Mpc
Indicate whether the statement is true or false
Three identical balls are thrown from the top of a building, all with the same initial speed. The first ball is thrown horizontally, the second at some angle above the horizontal, and the third at some angle below the horizontal as in the figure below. Neglect air resistance, rank the speeds of the balls as they reach the ground, from fastest to slowest