A beam of electrons is employed in
A) a gold-foil experiment.
B) a cathode-ray tube.
C) a LED television screen.
D) an oil-drop experiment.
Answer: B
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Batter up! Your bat hits the ball pitched to you with a 1500-N instantaneous force. The ball hits the bat with an instantaneous force, whose magnitude is
A) somewhat less than 1500 N. B) exactly equal to 1500 N. C) essentially zero. D) somewhat greater than 1500 N.
A(n) ____________________ is a rapidly spinning neutron star that accelerates charged particles near the poles of its magnetic field
Fill in the blank(s) with correct word
___________ are produced when two galaxies pass near each other and pull large streamers of stars, gas, and dust away from the galaxies
a. Ring galaxies b. Spiral galaxies c. Rotation curves d. Tidal tails e. Irregular galaxies
A 0.150-kg air track cart is attached to an ideal spring with a force constant (spring constant) of 3.58 N/m and undergoes simple harmonic oscillations. What is the period of the oscillations?
A) 2.57 s B) 0.527 s C) 0.263 s D) 1.14 s E) 1.29 s