Why is the wire connecting your dryer to the circuit breaker in your house thicker (of greater diameter) than the wire connecting a table lamp to the electric outlet?
What will be an ideal response?
In the book, we mention the resistivity as the basis of resistance. For a given
diameter, both pieces of wire would have the same resistivity but a longer piece will have a
greater resistance. Here, both pieces of wire would have the same resistivity but their
diameters would be different. This difference gives rise to the difference in resistance. The
thinner wire exhibits greater resistance than thicker wire. This occurs because the larger wire
allows the charges more space to "get by" the atoms on the lattice (this way of thinking
about currents reflects the classical Drude model of conductivity). The thicker wire can
therefore carry much more current without generating too much Joule heat.
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Friction: As shown in the figure, block B on a horizontal tabletop is attached by very light horizontal strings to two hanging blocks, A and C. The pulleys are ideal, and the coefficient of kinetic friction between block B and the tabletop is 0.100. The masses of the three blocks are mA = 12.0 kg, mB = 7.00 kg, and mC = 10.0 kg. Find the magnitude and direction of the acceleration of block B after the system is gently released and has begun to move.
What will be an ideal response?
According to the impulse-momentum relationship Ft = change in mv, a falling baseball hits a player with a force F. The t in the equation is the time
A) the ball falls before hitting the player. B) of contact of the ball hitting the player. C) of reflex as the player responds to being hit. D) all of the above E) none of the above
If you were to travel at a speed close to the speed of light, you would notice which of the following?
A. Your pulse rate has decreased B. Your iPod plays music more slowly-everyone sounds like a baritone C. Your mass has increased D. You would notice all of the effects listed E. You would notice none of the effects listed because you are in an inertial frame
A convex mirror has a focal length of ?20 cm. What is the object distance if the image distance is ?10 cm?
a. 10 cm b. 40 cm c. 60 cm d. 20 cm e. 30 cm