A force of 6.0 N acts on a charge of 3.0 ?C when it is placed in a uniform electric field. What is the magnitude of this electric field?
A) 18 MN/C
B) 2.0 MN/C
C) 1.0 MN/C
D) 0.50 MN/C
E) 130 MN/C
B
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A contact lens is made of plastic with an index of refraction 1.50 . The lens has an outer radius of curvature of + 1.65 cm and an inner radius of curvature of + 5.85 cm. What is its focal length?
a. –4.60 cm b. +1.53 cm c. +2.57 cm d. +4.60 cm e. –2.57 cm
What happens to energy in the Sun's convection zone?
A) Energy is transported outward by the rising of hot plasma and sinking of cooler plasma. B) Energy is produced in the convection zone by thermal radiation. C) Energy slowly leaks outward through the radiative diffusion of photons that repeatedly bounce off ions and electrons. D) Energy is produced in the convection zone by nuclear fusion.
A child has a temperature of 104°F. What is the temperature in degrees kelvin?
a. 40 b. 406 c. 401 d. 313 e. 349
The interstate on-ramp is 1.5 km West of your home, and on leaving for grandmother’s house you are only able to accomplish an average velocity of 12 km/hr between your home and the on-ramp. At the onramp, you wait for traffic, for 2.0 min – and then are able to proceed toward grandmother’s house. If you wish to arrive there, which is 15 km South of the onramp, over a river and through some woods, in a total elapsed time of 25.0 minutes, what average speed must you maintain on the interstate highway?
A. 51 km/hr B. 67 km/hr C. 36 km/hr D. none of these.