A 3.0-kg object moving 8.0 m/s in the positive x direction has a one-dimensional elastic collision with an object (mass = M) initially at rest. After the collision the object of unknown mass has a velocity of 6.0 m/s in the positive x direction. What is M?
a. 7.5 kg
b. 5.0 kg
c. 6.0 kg
d. 4.2 kg
e. 8.0 kg
b
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A) the number of intelligences in the entire universe B) the number of technical civilizations in our galaxy presently C) the number of stars with habitable planets D) the number of planets with life in the universe E) the number of planets in just our galaxy
Any rock having a very large mass would necessarily
A) be very difficult to accelerate. B) move very slowly. C) have a very large weight. D) All of the above. E) need to go on a diet.
The critical angle for a beam of light passing from water into air is 48.8°. This means that all light rays with an angle of incidence in the water that is greater than 48.8° will be
A) totally absorbed by the water. B) totally reflected. C) partially reflected and partially transmitted. D) totally transmitted.
The average size of a white dwarf is about the same size as the Earth
a. True b. False Indicate whether the statement is true or false