Two tiny particles having charges of +5.00 ?C and +7.00 ?C are placed along the x-axis. The +5.00-µC particle is at x = 0.00 cm,
and the other particle is at x = 100.00 cm. Where on the x-axis must a third charged particle be placed so that it does not experience any net electrostatic force due to the other two particles?
A) 4.58 cm B) 45.8 cm C) 50 cm D) 91.2 cm E) 9.12 cm
B
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According to our theory of solar system formation, what are asteroids and comets?
A) the shattered remains of collisions between planets B) chunks of rock or ice that condensed after the planets and moons finished forming C) chunks of rock or ice that were expelled from planets by volcanoes D) leftover planetesimals that never accreted into planets
Why are radio waves probably the most efficient way to communicate between civilizations?
A) radio waves are easy to produce and are not affected much by interstellar matter in the galaxy B) radio waves are the most penetrating of all electromagnetic radiations C) all advanced civilizations are certain to use radio waves for communication D) radio waves are the only kind of electromagnetic radiation that can carry information
A proton and an electron are released from rest, with only the electrostatic force acting. Which of the following statements must be true about them as they move toward each other? (There could be more than one correct choice.)
A) Their acceleration keeps decreasing. B) Their kinetic energy keeps increasing. C) Their electric potential energy keeps decreasing. D) Their kinetic energy keeps decreasing. E) Their electric potential energy keeps increasing.
Evaporator tubes in a refrigerator are constructed of 1 inch OD aluminum tubing with 1/8 in thick walls. The air surrounding the tubing is at 25ºF and the refrigerant in the evaporator is at 15ºF. Estimate the heat transfer to the refrigerant over 1 foot of length.
What will be an ideal response?