A star is observed with a surface temperature of 3,000 K and a luminosity of 105 solar. What is the approximate radius of this star?
A) 30 Msun B) 0.3 Msun
C) 3 Msun D) The radius cannot be determined.
D
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If the sun is at one focus of the ellipse, what is at the other focus?
What will be an ideal response?
A 3.0-kg mass moving in the positive x direction with a speed of 10 m/s collides with a 6.0-kg mass initially at rest. After the collision, the speed of the 3.0-kg mass is 8.0 m/s, and its velocity vector makes an angle of 35° with the positive x axis. What is the magnitude of the velocity of the 6.0-kg mass after the collision?
A. 2.2 m/s B. 2.9 m/s C. 4.2 m/s D. 3.5 m/s E. 4.7 m/s
Between the processes of nuclear fission and fusion, radioactive by-products are more characteristic of nuclear
A) fission. B) fusion. C) both of these D) neither of these
Explain the geometry of an ellipse, which Kepler used to describe a planet's orbits
What will be an ideal response?