Wien's law can only tell us about the surface temperature of a star, not the temperatures of the star's interior.
Answer the following statement true (T) or false (F)
True
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A 2.8-kg tool can move on a perfectly smooth ramp that slants at 42° above the horizontal. What are the magnitude and direction of the acceleration of this tool if it is sliding (a) up the ram, (b) down the ramp?
What will be an ideal response?
Cart A with momentum p (in magnitude) and speed 2v collides with cart B at rest. After the collision, cart A has speed v and cart B has speed 3v, as shown. What can you say about the momentum of cart B after the collision?
A hypothetical PV solar cell in space can utilize solar radiation between 0.8 and 1.1 ?m in wavelength. Estimate the maximum theoretical efficiency for this solar cell facing the sun using the ideal blackbody curve of the sun as the source. Supposing that all the radiation outside the spectral range utilized by the solar cell for generating electricity is dissipated into heat, estimate the rate at which a module of solar cells of 1.0 m2 area would have to be cooled to maintain the temperature of the module below 90°F.
GIVEN • PV solar cell utilizing radiation between 0.8 and 1.1 ?m. • Surface area of solar cells (A)= 1.0 m2 FIND • Maximum theoretical efficiency of solar cell facing the sun using ideal blackbody curve of the sun. • Rate at which module of solar cells would have to be cooled to maintain temperature of module below 900F or 320C. ASSUMPTIONS • The sun’s radiation can be assumed as ideal black body curve. • The variation in irradiation is linear for the interval of 0.8 to 1.1 ?m.
Of the possible statements that parallel rays are brought to a focus by a 1) concave mirror, 2) convex mirror, 3) converging lens, 4) diverging lens, the correct answer is
a. 1 and 2. b. 3 and 4. c. 1 and 3. d. 2 and 3. e. 2 and 4.