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Chapter 2: Q2-9P (page 82)
Question: A truck driver slams on the brakes and the momentum of the truck changes fromtoindue to a constant force of the road on the wheels of the truck. As a vector, write the net force exerted on the truck by the surroundings.
The net force exerted on the truck by the surrounding isN
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The driver of a car traveling at a speed of 18 m/s slams on the brakes and comes to a stop in 4s . If we assume that the car's speed changed at a constant rate (constant net force): (a) what was the car's average speed during this 4 s interval? (b) How far did the car go in this 4 s interval?
As shown in Figure 19.74, a spherical metal shell of radius has a charge (on its surface) and is surrounded by a concentric spherical metal shell of radius which has a charge (on its inner surface).
(a) Use the definition of capacitance: to find the capacitance of this spherical capacitor.
(b) If the radii of the spherical shells and are large and nearly equal to each other, show that can be written as (which is also the equation for the capacitance of a parallel-plate capacitor) where is the surface area of one of the spheres, and is the small gap distance between them .
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 ?
In the circuit shown in Figure 19.77 the emf of the battery is . Resistor has a resistance of , resistor has a resistance of , and resistor localid="1662203602529" has a resistance of localid="1662203617219" . A steady current flows through the circuit.
(a)What is the equivalent resistance of and ? (b) What is the equivalent resistance of all three resistors? (c) What is the conventional current through
The performance of two different cars, car 1and car 2, was measured on a long horizontal test track. Car 1started from rest and ran with constant acceleration until it was halfway down the track and then stopped accelerating, continuing to run at the attained speed to the end of the track. Car 2started from rest and ran with a constant acceleration for the entire distance. It was observed that both cars covered the test distance in the same amount of time. (a) What was the ratio of the average speed of carto that of car 2? (b) What was the ratio of the initial acceleration of car 1to that of car 2? (c) What was the ratio of the final speed of car 1to that of car 2?
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