A 30-?F capacitor is charged to 40 V and then connected across an initially uncharged 20-?F capacitor. What is the final potential difference across the 30-?F capacitor?
a. 15 V
b. 24 V
c. 18 V
d. 21 V
e. 40 V
b
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Motional Emf: A conducting rod whose length is ? = 27.0 cm is placed on frictionless U-shaped metal rails that is connected to a lightbulb having a resistance of 5.00 ? as shown in the figure. The rails and the rod are in the plane of the page. A constant uniform magnetic field of strength 1.20 T is applied perpendicular to and out of the paper. An external applied force moves the rod to the right with a constant speed. At what speed should the rod be pulled so that the lightbulb will consume energy at a rate of 1.10 W?
A. 2.00 m/s B. 3.50 m/s C. 4.26 m/s D. 6.00 m/s E. 7.24 m/s
Thin Lenses: A convex lens has focal length f. If an object is placed at a distance beyond 2f from the lens on the principal axis, the image is located at a distance from the lens
A. of 2f. B. between f and 2f. C. of f. D. between the lens and f. E. of infinity.
Physicists have detected hot dark matter particles in terrestrial laboratories, but it is much harder to observe than cold dark matter
Indicate whether the statement is true or false
Although fossils can be made in numerous ways, only a tiny fraction of living organisms leave behind any kind of fossil remnant because
A) most minerals that replace organic material are soluble in water and so dissolve away B) the vast majority of dead organisms decay long before any mineral replacement can occur C) the organic material is destroyed by radioactivity D) they are destroyed by geological processes before mineral replacement can occur