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Chapter 2: Q52P-a (page 45)
In the circuit shown in Figure 19.75, the emf of the battery is . Resistor has a resistance of , and resistor has a resistance of . A steady current flows through the circuit. (a) What is the absolute value of the potential difference across ? (b) What is the conventional current through ?
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Question:A ball moves in the direction of the arrow labelled in Figure. The ball is struck by a stick that briefly exerts a force on the ball in the direction of the arrow labelled. Which arrow best describes the direction of, the change in the ball's momentum?
A carbon resistor is 5 mm long and has a constant cross section of .The conductivity of carbon at room temperature is .In a circuit its potential at one end of the resistor is 12 V relative to ground, and at the other end the potential is 15 V. Calculate the resistance Rand the current I (b) A thin copper wire in this circuit is 5 mm long and has a constant cross section of .The conductivity of copper at room temperature is .The copper wire is in series with the carbon resistor, with one end connected to the 15 V end of the carbon resistor, and the current you calculated in part (a) runs through the carbon resistor wire. Calculate the resistance Rof the copper wire and the potential at the other end of the wire.
You can see that for most purposes a thick copper wire in a circuit would have practically a uniform potential. This is because the small drift speed in a thick, high-conductivity copper wire requires only a very small electric field, and the integral of this very small field creates a very small potential difference along the wire.
Here are questions about human diet. (a) A typical candy bar provides 280 calories (one “food” or “large” calorie is equal to ). How many candy bars would you have to eat to replace the chemical energy you expend doing 100 sit-ups? Explain your work, including any approximations or assumptions you make. (In a sit-up, you go from lying on your back to sitting up.) (b) How many days of a diet of 2000 large calories are equivalent to the gravitational energy difference for you between sea level and the top of Mount Everest, 8848 m above sea level? (However, the body is not anywhere near 100% efficient in converting chemical energy into change in altitude. Also note that this is in addition to your basal metabolism.)
(1) Two external forces,(40,70,0)Nand (20,10,0)N, act on a system. What is the net force acting on the system? (2) A hockey puck initially has momentum (0,2,0)kg.m/s. It slides along the ice, gradually slowing down, until it comes to a stop. (a) What was the impulse applied by the ice and the air to the hockey puck? (b) It took 3 seconds for the puck to come to a stop. During this time interval, what was the net force on the puck by the ice and the air (assuming that this force was constant)?
Two very thin circular plastic sheets are close to each other and carry equal and opposite uniform charge. Explain briefly why the field between the sheets is much larger than the field outside. Illustrate your argument on a diagram.
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