What is the mass of air in a room that measures 5.0 m × 8.0 m × 3.0 m? (The density of air is 1/800 that of water)
150 kg
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If the initial speed of a projectile is doubled
A) Its range will be increased by 1.41. B) Its range will double. C) Its range will be decreased by a factor of two. D) Its range will quadruple. E) Its range will decrease by a factor of four.
Why is the core hot?
A. from both the decay of radioactive atoms and the leftover heat B. from heat left over from the planet's birth C. The high pressure in the core drives the temperature higher. D. from the steady decay of radioactive atoms in the rock E. None of these choices are correct.
A block holding a ringing tuning fork oscillates back and forth, attached to a wall by a spring of spring on a horizontal, frictionless surface, with amplitude 17 cm. The mass of the tuning fork and block together is 0.75 kg. An observer who is situated so that the block’s direction of motion is either directly towards or away from him notes that the frequency he hears varies between 174 and 178 Hz. What is the spring constant for the spring ? The speed of sound at the time of the experiment is 340 m/s.
A. 390 N/m B. 203 N/m C. 1590 N/m D. 290 N/m E. 100 N/m
What parameters do Hubble's Law relate to each other?
A.) Galaxy rotation speed and luminosity. B.) Galaxy classification and mass. C.) Cepheid star period and luminosity. D.) Galaxy recession velocity and distance. E.) Galaxy mass and distance.