If you are asked to make a very sensitive glass thermometer, which of the following working fluids would you choose?
1.mercury
2.alcohol
3.gasoline
4.glycerin
3
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The tail of a comet always points ________.
A. toward the Sun B. away from the Sun C. backward D. forward
A binary star system in the constellation Orion has an angular separation between the stars of 4×10?5 radians. Assuming a wavelength of 500 nm, what is the smallest aperture (diameter) telescope that will just resolve the two stars? (1 nm = 10?9 m)
a. 1.2 cm b. 1.5 mm c. 1.5 cm d. 4.8 cm e. 20 mm
A plane parallel plate capacitor has plates of 10 cm2 area that are 1.0 mm apart. At an instant when charge is being accumulated on the plates at a rate of 12 nC/s, the displacement current between the plates is
a. 1.06 × 10^?16 A. b. 1.2 × 10^?8 A. c. 8.85 × 10^?9 A. d. 1.00 A. e. 1.36 A.
Light travels ________ in water than in air.
A. faster B. slower C. perpendicular to D. at the same speed