All stars are born with the same basic composition, yet stars can differ greatly in appearance. Which two factors are most important in determining the current appearance of a star?
A) mass and stage of life
B) luminosity and stage of life
C) age and location in the galaxy
D) mass and surface temperature
E) apparent brightness and luminosity
A) mass and stage of life
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The sum of the kinetic and potential energy is equal to the _____________energy.
Fill in the blank(s) with the appropriate word(s).
A 5.00 kg mass is located at (2.00 m, 0.00 m, 3.00 m) and a 2.00 kg mass is located at (0.00 m, 4.00 m, –2.00 m). The center of gravity of the system of masses is
A. (10/7m, 8/7m, 11/7m). B. (11/7m, 7/7m, 8/7m). C. (7/7m, 10/7m, 11/7m). D. (10/7m, 7/7m, 8/7m). E. (8/7m, 7/7m, 10/7m).
A steel guitar string with a diameter of 0.300 mm and a length of 70.0 cm is stretched by 0.500 mm while being tuned. How much force is needed to stretch the string by this amount? Young's modulus for steel is 2.0 × 1011 N/m2
What will be an ideal response?
A piece of aluminum with a mass of 1.0 kg and density of 2700 kg/m3 is suspended from a light cord and then completely immersed in a container of water having density 1000 kg/m3
(a) Determine the volume of the piece of aluminum. (b) Determine the tension in the cord when the aluminum is immersed in the container of water.