A soda can with a small amount of water is on a hot stove. Soon steam comes from its opening. When the can is quickly inverted into a pan of water, the can is crushed by
A) suction of the can interior.
B) condensation.
C) atmospheric pressure.
D) a drop in temperature.
Answer: C
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A projectile is fired at an angle of elevation of 30°. Neglecting air resistance, what are possible angles in flight between the acceleration vector and the velocity vector?
a. 160° and 40° b. 20° and 70° c. 90° and 30° d. none of the above e. 10° and 30°
A gas heated to millions of degrees would emit
A) mostly radio waves. B) mostly x-rays. C) mostly ultraviolet light. D) an equal amount of all wavelengths of light. E) no light because it is too hot.
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Indicate whether the statement is true or false
The standard kilogram is a platinum-iridium cylinder 39 mm in height and 39 mm in diameter. What is the density of the material?