A car is traveling on an interstate where north is taken to be the positive direction. A graph of the distance it has moved as a function of time is shown. What is the physical significance of the slope?
A. The distance the car has moved.
B. The velocity of the car.
C. The acceleration of the car.
B. The velocity of the car.
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According to the period-luminosity relation, the long-period Cepheids are more luminous than the short-period Cepheids
Indicate whether the statement is true or false
________ optics greatly reduces the effect of atmospheric turbulence by deforming the shape of the mirror by computer control
Fill in the blank(s) with correct word
Collisions between galaxies tend to destroy, not create, stars
Indicate whether the statement is true or false
Rising air expands and cools. The rate of cooling depends on
A) the air's moisture content. B) the dry adiabatic lapse rate. C) the energy of the water-vapor molecules. D) temperature inversions.