In a velocity selector for ions, when the electric field is increased 50%, what change in the magnetic field is necessary to select the same speed as before?
A. a 50% decrease
B. a 25% decrease
C. no change
D. a 25% increase
E. a 50% increase
E. a 50% increase
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When light passes through two or more narrow slits, an alternating dark and bright pattern is observed on a screen because of
a. interference. b. diffraction. c. specular reflection. d. diffuse reflection. e. polarization.
A 10-A current flows for two minutes. (a) How much charge has passed through this circuit? (b) How many electrons have passed any point in the circuit?
What will be an ideal response?
An ore car of mass 4000 kg starts from rest and rolls downhill on tracks from a mine. A spring with k = 400,000 N/m is located at the end of the tracks. At the spring's maximum compression, the car is at an elevation 10 m lower than its elevation at the starting point. How much is the spring compressed in stopping the ore car? Ignore friction.
What will be an ideal response?
Planets wobble in their orbits due to
A) the gravitational attraction to other planets. B) uncertainties in the inverse-square law. C) elliptical-orbit quirks. D) all of the above E) none of the above