Suspend your body from a pair of vertical ropes and the tension in each rope will be
A) half your weight.
B) equal to your weight.
C) greater than your weight.
D) none of the above
Answer: A
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A 4.00 kg ball is moving at 2.00 m/s to the WEST and a 6.00 kg ball is moving at 2.00 m/s to the NORTH. The total momentum of the system is
A. 21.6 kg m/s at an angle of 17.7 degrees NORTH of WEST. B. 14.4 kg m/s at an angle of 45.2 degrees SOUTH of WEST. C. 21.6 kg m/s at an angle of 45.2 degrees SOUTH of WEST. D. 14.4 kg m/s at an angle of 56.3 degrees NORTH of WEST. E. 21.6 kg m/s at an angle of 56.3 degrees NORTH of WEST.
Infrared observations are used to determine the mass of asteroids because ________.
A. most asteroids are made of dark minerals which are more efficient at reflecting infrared light than visible light B. the Hubble Space Telescope only has infrared cameras C. the infrared radiation is the glow of heat from the asteroid, and larger asteroids emit more infrared light D. asteroids reflect too little visible light to use optical telescopes for the measurements
Which of the following statements correctly describes the law of conservation of energy?
A) An object always has the same amount of energy. B) Energy can change between many different forms, such as potential, kinetic, and thermal, but it is ultimately destroyed. C) Energy can change between many different forms, such as potential, kinetic, and thermal, but the total quantity of energy in the universe never changes. D) The fact that you can fuse hydrogen into helium to produce energy means that helium can be turned into hydrogen to produce energy. E) It is not really possible for an object to gain or lose potential energy because energy cannot be destroyed.
A convex-concave thin lens is made with the radius of curvature of the convex surface being 25.0 cm and the concave surface 45.0 cm. If the glass used has index of refraction 1.500, what is the focal length of this lens?
A) -32.0 cm B) 32.0 cm C) 113 cm D) 67.5 cm E) -113 cm