A force on an object is given by F(x) = (2.00 N/m)x - (3.00 N/m3)x3. What is a potential energy function U(x) for this conservative force?
What will be an ideal response?
Answer: U(x) = (-1.00 N/m)x2 + (0.750 N/m3)x4
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Recent measurements of the variations of the cosmic background radiation suggest that the curvature of the Universe is ________.
A. negative B. positive C. flat (i.e., no curvature)
The root mean square speed of a gas molecule is greater than the average speed, because the former gives a greater weight to
A. lighter molecules. B. heavier molecules. C. lower speeds. D. higher speeds. E. more probable speeds.
Equal charges, one at rest, the other having a velocity of 104 m/s, are released in a uniform magnetic field. Which charge has the largest force exerted on it by the magnetic field?
A. The charge that is at rest. B. The charge that is moving, if its velocity is parallel to the magnetic field direction when it is released. C. The charge that is moving if its velocity makes an angle of 45o with the direction of the magnetic field when it is released. D. The charge that is moving if its velocity is perpendicular to the magnetic field direction when it is released. E. All the charges above experience equal forces when released in the same magnetic field.
When a current of 2.0 A flows in the 100-turn primary of an ideal transformer, this causes 14 A to flow in the secondary. How many turns are in the secondary?
A) 4 B) 114 C) 356 D) 700 E) 14