The mass density of normal air is, at a particular temperature, 
If the average molecular mass of air is 29.0 u, how many air molecules are in spherical balloon of radius 15.0 cm?
a. 
b. 
c. 
d. 
e. 
f. 
a.
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Like Mars and Venus, Earth originally had a significant amount of carbon dioxide in its atmosphere. Where is the majority of the carbon now?
a. It has escaped into outer space. b. It is bound up in the plant life on Earth. c. It is bound up in rocks. d. It is dissolved into the oceans. e. It is still in the atmosphere in the form of complex molecules.
Components: The magnitude of 
is 5.5 m, and this vector lies in the second quadrant and makes an angle of 34 ° with the +y-axis. The components of 
are closest to:
A. Ax = -3.1 m, Ay = 4.6 m. B. Ax = 3.1 m, Ay = -4.6 m. C. Ax = 4.6 m, Ay = -3.1 m. D. Ax = -4.6 m, Ay = 3.1 m. E. Ax = -4.6 m, Ay = -3.1 m.
A 1.6-kg block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 190 N/m
The block is pulled from its equilibrium position at x = 0.00 m to a displacement x = +0.080 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. What is the velocity of the block at time t = 0.40 s? A) 0.82 m/s B) -0.82 m/s C) 0.30 m/s D) -0.30 m/s E) 0.00 m/s
A radioactive isotope of atomic number Z emits a beta-minus particle, and then the daughter nucleus emits a gamma ray. What is the atomic number of the resulting nucleus after both processes?
A) Z - 3 B) Z + 1 C) Z - 2 D) Z - 1