A beta particle is another name for a(n)
a. electron.
b. proton.
c. neutron.
d. helium nucleus.
e. photon.
a
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Due to inertia, perhaps a railroad train in motion should continue moving indefinitely when its engine is turned off. This is not observed because railroad trains
A) aren't massive enough. B) are too heavy. C) ride on straight tracks. D) encounter opposing forces.
Jupiter is about 5 AU from the Sun. In a ten billion to one scale model, Jupiter is
A) about 15 meters from the Sun. B) about a kilometer from the Sun. C) about 75 meters from the Sun. D) less than one meter from the Sun.
A farsighted boy has a near point at 2.3 m and requires contact lenses to correct his vision to the normal near point. What is the correct choice of lens power for the contact lenses?
A) -0.28 diopters B) +0.28 diopters C) -3.6 diopters D) +3.6 diopters E) +1.8 diopters
Three different resistors are connected in parallel. If R1 < R2 < R3, their equivalent resistance when connected is
1.between R1 and R2. 2.less than R1. 3.neither between R1 and R2 nor less than R1. 4.dependent on the order in which they are attached in parallel.