The luminosity of a star is the total amount of energy it radiates each second
Indicate whether the statement is true or false
T
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What is the cross-string method?
What will be an ideal response?
Conduction: A solid concrete wall has dimensions 4.0 m × 2.4 m and is 30 cm thick. The thermal conductivity of the concrete is 1.3 W/m ? K, and it separates a basement from the ground outside. The inner surface of the wall is at 18°C, and the outside surface is at 6°C. How much heat flows through the wall every hour?
A. 1.8 MJ B. 1.8 kJ C. 500 J D. 5.0 MJ E. 5.0 kJ
Electric Field of Point-Charges: Three equal-magnitude point charges of varying signs are placed at the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the center of the square?
A. A B. B C. C D. D
The transit method allows us in principle to find planets around
A) only a small fraction of stars that have planets. B) all stars that have planets of any kind. C) only stars of about the same mass and size as our Sun. D) only stars located within about 100 light-years of Earth.