A boy throws a ball with an initial velocity of 25 m/s at an angle of 30° above the horizontal. If air resistance is negligible, how high above the projection point is the ball after 2.0 s?
A) 25 m B) 43 m C) 13 m D) 50 m E) 5.4 m
E
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What do we mean by the star-gas-star cycle?
A) It is the idea that stars in close binary systems can exchange gas with one another. B) It is the set of nuclear reactions by which heavy elements are produced in the cores of massive stars. C) It describes the orbits of the stars and interstellar medium around the center of the galaxy. D) It is the continuous recycling of gas in the galactic disk between stars and the interstellar medium.
Mass is a vector quantity
Indicate whether the statement is true or false
Since 1 kilowatt equals 1000 watts, and 1 hour equals 3600 seconds, it follows that the kilowatt-hour is
A) an energy of 3.6 million joules. B) a power of 3.6 million watts. C) an energy of 3.6 million watts. D) a power of 3.6 million joules. E) None of the above.
The image formed by a diverging lens of a real object is always
A. Smaller than the object B. Inverted C. Larger than the object D. Virtual E. Real