Three masses are located as follows: a 3.5-kg mass is at the origin, a 4.2-kg mass at (0.0 m, 7.0 m), and a 6.5-kg mass at (24.0 m, 0.0 m). What is the gravitational energy of the system of masses? G = 6.67 x 10-11 N•m2/kg2
A) -2.8 × 10-10 J
B) -2.0 × 10-10 J
C) -1.4 × 10-10 J
D) -3.2 × 10-10 J
E) -3.9 × 10-10 J
A
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If a water sample contains 2 ppm of dissolved salt, it contains 2 g of salt in every ______________ g of water
Fill in the blank(s) with correct word
A sticky hockey puck slides along a frictionless, horizontal ice surface at 75 m/s in the +x direction. It collides with a second sticky puck originally sliding at 25 m/s in the -y direction. They collide totally inelastically. If the first puck has a mass equal to half that of the second, what is the angle of their final velocity vector below the +x direction?
A. 9.5 degrees B. 42 degrees C. 34 degrees D. 49 degrees E. 37 degrees
Which of the following best describes the axes of a Hertzsprung-Russell (H-R) diagram?
A) surface temperature on the horizontal axis and luminosity on the vertical axis B) mass on the horizontal axis and luminosity on the vertical axis C) surface temperature on the horizontal axis and radius on the vertical axis D) mass on the horizontal axis and stellar age on the vertical axis E) interior temperature on the horizontal axis and mass on the vertical axis
If you quickly run toward the orchestra at a concert, the frequency of the sound you hear will be
A) decreased. B) increased. C) neither of these