Two point charges are separated by 10.0 cm and have charges of +1.00 µC and -1.00 µC, respectively. What is the electric field at a point midway between the two charges? (ke = 8.99 × 10^9 N•m2/C2)
a. 14.4 × 10^6 N/C
c. 28.8 × 10^6 N/C
b. zero
d. 7.19 × 10^6 N/C
D
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Photon Energy: An x-ray tube accelerates electrons through a potential difference of 50.0 kV. If an electron in the beam suddenly give up its energy in a collision, what is the shortest wavelength x-ray it could produce? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, e = 1.60 × 10-19 C)
Fill in the blank(s) with the appropriate word(s).
Leaving a hot oven door open in a closed room on a cool day
A) decreases room temperature. B) increases room temperature. C) doesn't affect room temperature.
Water flows into a swimming pool at the rate of 7.0 gal/min. The pool is 17 ft wide, 32 ft long and 7.0 ft deep. How long does it take to fill? (1 U.S. gallon = 231 cubic inches)
a. 34 hours b. 68 hours c. 67 hours d. 136 hours e. 680 hours
Helium-neon laser light (l = 632.8 nm) is sent through a single slit of width 0.41 mm. What is the width of the central maximum on a screen 1.0 m in back of the slit? (1 nm = 10-9 m)
a. 5.3 mm c. 3.1 mm b. 4.2 mm d. 2.0 mm