A flat coil is wrapped with 200 turns of very thin wire on a square frame with sides 18 cm long
A uniform magnetic field is applied perpendicular to the plane of the coil. If the field changes uniformly from 0.50 T to 0.00 T in 8.0 s, find the emf induced in the coil.
A) 2.1 mV
B) 4.1 mV
C) 0.21 V
D) 0.41 V
D
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A compound microscope is made with an objective lens ( = 0.90 cm) and an eyepiece ( = 1.1 cm). The lenses are separated by a distance of 10 cm. If an object is 1.0 cm in front of the objective lens, where will the final image of the eyepiece be located?
a. ?30 b. ?15 c. ?23 d. ?11 e. ?9
In the amended Montreal Protocol, many nations agreed to phase out, by the year 2000,
a. trash burning. b. hydrocarbons. c. gasoline automobiles. d. CFCs.
Which arrow best indicates the direction of the electric field at point P created by the charge distribution on the sphere’s surface?
A. A B. B C. C D. D E. Zero F. AA G. BB H. CC I. DD
If an ideal gas molecule has a speed of 0.50 km/s at 20°C, what is its speed at 80°C?
A) 500 m/s B) 2000 m/s C) 550 m/s D) 1000 m/s