A planet orbiting another star is called a protoplanet
Indicate whether the statement is true or false
False
You might also like to view...
Heat is transferred at a rate of 0.1 kW through glass wool insulation (density = 100 kg/m3 ) with a 5 cm thickness and 2 m2 area. If the hot surface is at 70°C, determine the temperature of the cooler surface.
GIVEN
• Glass wool insulation with a density (?) = 100 kg/m3
• Thickness (L) = 5 cm = 0.05 m
• Area (A) = 2 m2
• Temperature of the hot surface (Th) = 70°C
• Rate of heat transfer (qk) = 0.1 kW = 100 W
FIND
• The temperature of the cooler surface (Tc)
ASSUMPTIONS
• One dimensional, steady state conduction
• Constant thermal conductivity
SKETCH
PROPERTIES AND CONSTANTS
The thermal conductivity of glass wool at 20°C (k) = 0.036 W/(m K)
Describe what the internal structure of the Sun looks like, indicating what physical phenomena are occurring there. In what respects (internal structure, energy generation, etc
) does the internal structure of a high mass Main Sequence star differ from that of the Sun?
Why did the era of nuclei end when the universe was about 380,000 years old?
A) The nucleosynthesis era that produced the nuclei heavier than helium ended. B) Photons were finally able to escape the plasma of the early universe and were no longer available to produce hydrogen and helium nuclei. C) Atomic nuclei were finally able to escape the plasma of the early universe. D) The universe had expanded and cooled enough for stable, neutral atoms to form. E) All the free particles had combined to form the nuclei of atoms.
A particle is moving with a certain speed. Its speed and momentum are being measured with respect to Earth. When the particle's speed doubles, the momentum increases by a factor of 4. What was the original speed of the particle?
A) 0.447c B) 0.488c C) 0.523c D) 0.648c E) 0.800c