Quarks, originally isolated in cosmic ray showers, are elementary particles possessing electric charge equal to 1/3 or 2/3 the magnitude of the charge of a proton
Indicate whether the statement is true or false
False (Quarks have never been isolated.)
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What will be an ideal response?
Water freezes at atmospheric pressure and a temperature of
A) 0 degrees Celsius. B) 32 degrees Fahrenheit. C) about 273 kelvin. D) all of the above E) none of the above
A mass is attached to a vertical spring and bobs up and down between points A and B. Where is the mass located when its kinetic energy is a minimum?
A) midway between A or B B) at either A or B C) one-fourth of the way between A and B
A block of mass M slides down a frictionless plane inclined at an angle ? with the horizontal. The normal reaction force exerted by the plane on the block is directed
A) parallel to the plane in the same direction as the movement of the block. B) parallel to the plane in the opposite direction as the movement of the block C) perpendicular to the plane. D) toward the center of the Earth. E) toward the center of mass of the block.