About the Introductory Astronomy category
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If a proton and an electron are placed a short distance apart,
A) they will be repelled from each other. B) they will feel no force. C) they will be attracted to each other. D) the electron will be repelled while the proton will be attracted. E) None of the above.
Jet planes operate by
A) rocket drive [i.e., ejecting heated rocket fuel rapidly out the back end of the engine]. B) ejecting ions out the back end of the engine. C) sucking in air, heating it , and allowing it to expand out the back end of the engine. D) sucking in air and blowing it rapidly out the back of the engine by means of propeller blades inside the engine. E) magic.
Resistance and Resistivity: A 120-m long metal wire having a resistivity of 1.68 × 10-8 ? ? m has a resistance of 6.0 ?. What is the diameter of the wire?
A. 0.065 mm B. 0.65 mm C. 0.65 cm D. 0.65 m
A projectile is projected from the origin with a velocity of 45.0 m/s at an angle of 30.0 degrees above the horizontal. What is the time it takes for the projectile to hit the ground?
A. 2.54 s B. 3.02 s C. 4.59 s D. 5.31 s E. 6.04 s