Jack, a quarterback, imparts a spin with his fingers when he throws the football during a match. The concept of _____ explains why the ball continues to spin rapidly as it flies through the air
A) kinetic energy
B) angular momentum
C) linear force
D) specific gravity
B
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Kinetic energy is proportional to mass
Indicate whether the statement is true or false
Suppose that a particular chemical substance is "pure" [contains no "impurities"], and that it is not possible to decompose this substance by chemical means. What can we conclude from this?
A) The substance must be a chemical compound. B) The substance must be an element. C) The substance must be one of the ideal, or perfect, gases. D) The substance must be incapable of entering into chemical reactions of any kind. E) None of the above.
If F = 8.0 N and M = 1.0 kg, what is the tension in the connecting string? The pulley and all surfaces are frictionless
?
?
a.
4.1 N
b.
3.5 N
c.
3.8 N
d.
3.1 N
e.
4.8 N
Most interstellar clouds remain stable in size because the force of gravity is opposed by ________ within the cloud.
A) thermal pressure B) degeneracy pressure C) radiation pressure D) stellar winds