An object undergoing free fall experiences
A. an increase in both its acceleration and velocity
B. a decrease in its acceleration and an increase in its velocity
C. a constant acceleration and an increase in its velocity.
C. a constant acceleration and an increase in its velocity.
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Electrical forces between charges are strongest when the charges are
a. far apart b. close together c. the electrical force is constant everywhere
A nonrelativistic electron is confined to a length of 500 pm on the x-axis. What is the kinetic energy of the electron if its speed is equal to the minimum uncertainty possible in its speed?
(h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J) A) 0.015 eV B) 0.15 eV C) 1.5 eV D) 15 eV E) 150 eV
On average, how often do impactors about 10 km in size, large enough to produce mass extinction, hit Earth?
A) once every century B) once every thousand years C) once every million years D) once every hundred million years E) once in Earth's history
Consider the equipotential diagram shown below and to the left: 
In what direction does the electric field at point P point?
A. A B. B C. C D. D