A 5.0-liter gas tank holds 1.7 moles of monatomic helium (He) and 1.10 mole of diatomic oxygen (O2 ), at a temperature of 260 K
The ATOMIC masses of helium and oxygen are 4.0 g/mol and 16.0 g/mol, respectively. What is the ratio of the root-mean-square (thermal) speed of helium to that of oxygen?
A) 1.4
B) 2.0
C) 2.8
D) 4.0
E) 5.6
C
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The iron nucleus has the greatest binding energy of any nucleus
A) True B) False
The only two forces acting on a body have magnitudes of 20 N and 35 N and directions that differ by 80°. The resulting acceleration has a magnitude of 20 m/s2 . What is the mass of the body?
a. 2.4 kg b. 2.2 kg c. 2.7 kg d. 3.1 kg e. 1.5 kg
Our solar system consists of
A) the Sun and all the objects that orbit it. B) the Sun and the planets, and nothing else. C) a few hundred billion stars, bound together by gravity. D) the Sun and several nearby stars, as well as the planets and other objects that orbit these stars.
An uncharged metal sphere is placed on an insulating puck on a frictionless table. While being held parallel to the table, a rod with a charge q is brought close to the sphere, but does not touch it. As the rod is brought in, the sphere
a. remains at rest. b. moves toward the rod. c. moves away from the rod. d. moves perpendicular to the velocity vector of the rod. e. moves upward off the puck.