A natural gas pipeline with a diameter 0.250 m delivers 1.55 cubic meters of gas per second. What is the flow speed of the gas in the pipeline?
31.6 m/s
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What type of galaxies do astronomers believe to be the most common?
a. Elliptical b. Spiral c. Irregular d. Astronomers have no idea which type of galaxy is more common.
Circular Apertures: Light from a He-Ne laser of wavelength 633 nm passes through a circular aperture. The resulting pattern is observed on a screen 4.0 m behind the aperture, where the width of the central bright circle is 1.1 cm. What is the diameter of the hole?
A. 560 ?m B. 9.8 ?m C. 32,000 ?m D. 4700 ?m
Earth's magnetic poles will eventually reverse. This shift will also cause the seasons to reverse.
Answer the following statement true (T) or false (F)
The force that propels a cannonball when fired from a cannon is
A) huge compared to the recoil force on the cannon. B) equal and opposite to the force the ball exerts on the cannon. C) in some cases, equal and opposite to the force the ball exerts on the cannon.