A stone is dropped from a certain height and penetrates into mud. All else being equal, if it is dropped from twice the height, how much farther should it penetrate?
a) Four times as far
b) The same distance
c) Twice as far
d) Three times as far
Ans: c) Twice as far
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An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 10^4 V before it hits the target. What is the kinetic energy of the electron in electron volts?
1.1.00 × 10^4 eV 2.1.60 × 10^-15 eV 3.1.60 × 10^-22 eV 4.6.25 × 10^22 eV 5.1.60 × 10^-19 eV
Neptune has a larger fraction of methane in its atmosphere than Uranus
Indicate whether the statement is true or false
If the plane x = 4 m is an equipotential surface, in which of the following directions can the electric field be in the region immediately adjacent to this plane?
a. the positive y direction b. both the positive and negative z directions c. the positive x direction d. more than one of these choices
The phase angle of a series RL ac circuit with a 100-? resistor and a 20.0-mH inductor is 70.0°. What is the inductive reactance of this circuit?
A) 150 ? B) 175 ? C) 100 ? D) 275 ? E) 200 ?