The speed of sound in helium is 965 m/s. If the density of helium is 
then what is the bulk modulus of helium?
A. 
B. 
C. 
D. 
E. 
D.
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What is the speed of an electron in the n = 4 Bohr orbit of the hydrogen atom?
A) 5.47 × 105 m/s B) 310 × 105 m/s C) 1.39 × 105 m/s D) 1.78 × 105 m/s E) 2.18 × 106 m/s
A simple compound microscope normally uses
A) a long focal length objective and a shorter focal length eyepiece. B) a short focal length objective and a longer focal length eyepiece. C) a short focal length objective and a shorter focal length eyepiece. D) a very long focal length objective and a longer focal length eyepiece.
A container is filled with water, and the pressure at the bottom of the container is P. Then the container is emptied halfway and topped off with oil of density 0.80 × 10^3 kg/m3, which floats on top of the water. What is the pressure at the bottom of the container now?
a. a pressure < P b. the same pressure P c. a pressure > P d. This is unable to be determined with the information given.
Work-Energy Theorem: A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m. If the coefficient of kinetic friction between the object and the surface is 0.20, what was the initial speed of the object?
A. 9.8 m/s B. 6.3 m/s C. 3.6 m/s D. 7.2 m/s E. 8.9 m/s