Which of the following statements concerning the nuclear force is false?
A)
The nuclear force is very short-ranged.
B)
The nuclear force is very weak and much smaller in relative magnitude than the electrostatic and gravitational forces.
C)
The nuclear force is attractive and not repulsive.
D)
The nuclear force acts on both protons and neutrons.
E)
The nuclear is one of only four known types of forces in nature.
B
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What is the key distinction between protostars and true (main-sequence) stars?
A) Protostars generate most of their energy from gravitational contraction, and stars generate it from nuclear fusion. B) Protostars are larger and more luminous than stars. C) Protostars have stronger magnetic fields than stars. D) Protostars are supported by thermal pressure, and stars are supported by degeneracy pressure.
Compound Microscope: A simple compound microscope normally uses
A. a short focal length objective and a shorter focal length eyepiece. B. a short focal length objective and a longer focal length eyepiece. C. a long focal length objective and a shorter focal length eyepiece. D. a very long focal length objective and a longer focal length eyepiece.
Which terrestrial planet is about one-third the size of Earth?
A. Earth B. Venus C. Mars D. Mercury
A venturi tube may be used as the inlet to an automobile carburetor. If the 2.0-cm diameter pipe narrows to a 1.0-cm diameter, what is the pressure drop in the constricted section for an airflow of 3.0 m/s in the 2.0-cm section? (r = 1.2 kg/m3.)
a. 70 Pa b. 85 Pa c. 100 Pa d. 120 Pa e. 81 Pa