An object is placed to the left of a converging lens. Determine if the following statement is true or false. The image can be upright or inverted
1.True
2.False
1
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Why are collisions between galaxies more likely than collisions of stars within galaxies?
A) Relative to their sizes, galaxies are much closer together than stars. B) Galaxies are much larger than stars. C) Galaxies travel through space much faster than stars. D) Galaxies have higher redshifts than stars.
An 20 cm-diameter horizontal steam pipe carries 1.66 kg/min of dry saturated steam at 120°C. If ambient air temperature is 20°C, determine the rate of condensate flow at the end of 3 m of pipe. Use an emissivity of 0.85 for the pipe surface. If heat losses are to be kept below 1 per cent of the rate of energy transport by the steam, what thickness of fiberglass insulation is required? The rate of energy transport by the steam is the heat of condensation of the steam flow. The heat of vaporization of the steam is 2210 kJ/kg.
GIVEN • A horizontal steam pipe in air • Pipe outside diameter (D) = 20 cm= 0.2 m • Mass flow rate of steam (ms) = 1.66 kg/min=0.0277 kg/s • Steam temperature (Ts) = 120°C =393 K • Ambient air temperature (T?) = 20°C= 293 K • Emissivity of pipe surface (?) = 0.85 • Heat of vaporization (hfg) = 2210 kJ/kg FIND (a) Rate of condensate flow (mc) at the end of 3 m of pipe. (b) Thickness of fiberglass insulation (S) to keep loss below 1% of the energy transport by steam ASSUMPTIONS • Steady state • Air is still • Thermal resistance of the convection in the pipe and of the pipe wall are negligible • The surroundings behave as an enclosure at T? • Insulation is foil covered, its emissivity ? 0.0 PROPERTIES AND CONSTANTS the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4) Thermal conductivity of fiberglass (ki) = 0.035 W/(m K) for dry air at the mean temperature of 70°C Thermal expansion coefficient (?) = 0.00291 1/K Thermal conductivity (k) = 0.0288 W/(m K) Kinematic viscosity (?) = 17.1*10-6 m2/s Prandtl number (Pr) = 0.71
At apogee, the Moon is at its farthest from the Earth and thus appears larger than normal. Because of this, it can produce total solar eclipses, but not annular solar eclipses
Indicate whether the statement is true or false
Which of the following is TRUE?
a) It is possible for galaxies that are very distant to actually move through space ata speed several times the speed of light. b) A redshift occurs when a photon loses energy and slows down as itmoves through space. c) We see distant galaxies as they were billions or even tens of billions ofyears ago. d) We measure a redshift for roughly half of the galaxies that we observe, and for theothers we measure a blueshift. e) The center of the universe is located at a point about 200 Mpc from us in the centerof a cluster of galaxies.