Pluto is classified by as a
A) full-fledged planet.
B) dwarf planet.
C) moon.
Answer: B
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Suppose a uniform electric field of 4 N/C is in the positive x direction. When a charge is placed at and fixed to the origin, the resulting electric field on the x axis at x = 2 m becomes zero. What is the magnitude of the electric field at x = 4 m on the x axis at this time?
a. 0 b. 1 N/C c. 2 N/C d. 4 N/C e. More information is needed to find the resulting field magnitude at this position.
A laser beam sends a uniform radiation beam towards the hemispherical opening in a solid housing with dimensions as shown. The surface of the cavity is black and essentially insulated from the surrounding housing material. The hemispherical cavity is a thin-walled metal with a black surface. The temperature of the housing as well as that of the surroundings is 25°C. Determine the radiant flux of the laser beam, G0 [W/m2], if a thermocouple located on the hemispherical surface indicates a temperature of 10°C.
GIVEN
• Laser beam sending uniform radiation beam towards the hemispherical opening.
• Temperature of housing and surrounding (T?)= 250C.
• Temperature difference on thermocouple in hemispherical surface (?Tc) = 100C.
FIND
• Radiant flux of the laser beam.
ASSUMPTIONS
• Cavity surface is black and perfectly insulated from its mounting material.
• Negligible convection heat transfer from cavity surface.
• Surroundings are large, isothermal.
Which of the following best describes rain on Venus?
A) It does not have rain. B) It has sulfuric acid rain that causes erosion on the surface. C) It has sulfuric acid rain in its atmosphere, but the drops evaporate before hitting the surface. D) It has liquid water rain that causes erosion on the surface.
H II regions are usually found isolated from other stars or types of nebulae
Indicate whether the statement is true or false