A 4.00 kg ball is moving at 2.00 m/s to the SOUTH and a 6.00 kg ball is moving at 2.00 m/s to the NORTHWEST. The total momentum of the system is
A. 15.8 kg m/s at an angle of 3.27 degrees NORTH of WEST.
B. 8.5 kg m/s at an angle of 3.27 degrees NORTH of WEST.
C. 15.8 kg m/s at an angle of 17.2 degrees NORTH of WEST.
D. 8.5 kg m/s at an angle of 17.2 degrees NORTH of WEST.
E. 20.1 kg m/s at an angle of 27.5 degrees NORTH of WEST.
B. 8.5 kg m/s at an angle of 3.27 degrees NORTH of WEST.
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Interactions among galaxies also are thought to influence a galaxy's type in at least some cases. Which of the following does not support the idea that interactions can shape galaxies?
A) the presence of features, such as "tails" extending out of galaxies, bridges between galaxies, and rings of stars around galaxies B) the fact that galaxies with distorted appearances are more common at great distances than nearby C) computer modeling of collisions between galaxies D) the fact that more distant galaxies have larger redshifts
A pipe of length 10.0 m increases in length by 1.5 cm when its temperature is increased by 72°F. What is its coefficient of linear expansion?
a. 38 × 10^?6/°C b. 75 × 10^?6/°C c. 68 × 10^?6/°C d. 28 × 10^?6/°C e. 47 × 10^?6/°C
If the average density of matter and energy in the Universe is more than the critical density, space-time will be _____
A) closed B) flat C) open D) infinite
A 0.20-kg object attached to the end of a string swings in a vertical circle (radius = 80 cm). At the top of the circle the speed of the object is 4.5 m/s. What is the magnitude of the tension in the string at this position?
a. 7.0 N b. 2.0 N c. 3.1 N d. 5.1 N e. 6.6 N