Which of these are SI units?
a. centimeters
b. newtons
c. pounds
d. seconds
e. none of the above
b, d
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If used in a single instrument to greatly enhance its resolution, the four separate mirrors of the VLT will be acting as a(n) ________
Fill in the blank(s) with correct word
A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
A. 8 × 10?5 W/m2 B. 8 × 10?6 W/m2 C. 3 × 10?3 W/m2 D. 0.8 W/m2 E. 2.5 × 10?5 W/m2
How is the unit of a tesla defined?
a. 10,000 tesla is one coulomb. b. The strength of the electric field one meter away from a point charge of 1 coulomb is one tesla. c. The strength of the electric field at a distance of 1 meter from a long straight wire carrying a charge of 1 coulomb per meter is one tesla. d. The strength of the magnetic field at a distance of 1 meter from a long straight wire carrying a current of 1 ampere is 2 × 10^-7 tesla. e. One tesla is one thousand volts.
A certain brand of hot dog cooker applies a potential difference (120 V) to opposite ends of the hot dog and cooks by means of the joule heat produced. If 60 kJ is needed to cook each hot dog, what current is needed to cook four hot dogs simultaneously in 3.0 min?
a. 11 A b. 2.8 A c. 8.3 A d. 2.1 A e. 3.6 A