A binary system that looks like the one depicted in this painting should shine brightly in x-rays. Which one of the four labeled regions is the source of most of the x-rays?

A) Region I
B) Region II
C) Region III
D) Region IV


B) Region II

Physics & Space Science

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Determine the overall heat transfer coefficient based on the inside diameter of the tube and shell heat exchanger shown in the figure.

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What holds the Sun together?

A. quantum forces B. the pressure of the solar wind C. radiation pressure D. the Sun's magnetic field E. the Sun's gravity

Physics & Space Science

How much work is done by a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?

a. 0.22 kJ b. 0.20 kJ c. 0.24 kJ d. 0.27 kJ e. 0.31 kJ

Physics & Space Science

If 700 Joules of heat is added to a system, and the internal energy increases by 450 Joules, how much work is done by the system?

a. –1150 J b. –250 J c. 700 J d. 250 J e. 1150 J

Physics & Space Science