An ideal air-filled parallel-plate capacitor with horizontal plates has a plate separation of 5.0 cm
If the potential difference between the plates is 2000 V, with the top plate at the higher potential, what are the magnitude and direction of the electric field between the plates?
A) 100 N/C downward B) 100 N/C upward
C) 40000 N/C upward D) 40000 N/C downward
D
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Buoyancy: A crane lifts a steel submarine of density 7800 kg/m3 and mass 20,000 kg. What is the tension in the lifting cable (a) when the submarine is submerged in water of density 1000 kg/m3, and (b) when it is entirely out of the water?
A. (a) 2.0 × 105 N (b) 1.7 × 105 N B. (a) 1.7 × 105 N (b) 2.0 × 105 N C. (a) 2.6 × 103 N (b) 2.0 × 105 N D. (a) 2.0 × 105 N (b) 2.6 × 103 N
By what factor would the total power from a black body be modified if the surface area were to decrease by a factor of two while the temperature was doubled? /span>
1.1/16 2.1/8 3.1/4 4.1 5.4 6.8 7.None of the above 8.Cannot be determined
Snell's Law: A beam of light traveling in air strikes a slab of transparent material. The incident beam makes an angle of 40° with the normal, and the refracted beam make an angle of 26° with the normal. What is the speed of light in the transparent material? (c = 3.0 × 108 m/s)
A. 1.0 × 108 m/s B. 2.0 × 108 m/s C. 2.3 × 108 m/s D. 3.0 × 108 m/s E. 0.50 × 108 m/s
A filtergram is a photograph of the Sun's surface made
a. in a band of wavelengths in the infrared. b. in a band of wavelengths in the ultraviolet. c. using the Zeeman effect. d. with only those photons emitted in a specific spectral line. e. none of the others.