Connect with LearnSmart for Krauskopf: The Physical Universe, 16e
16th Edition
ISBN: 9781259663895
Author: KRAUSKOPF, Konrad B.
Publisher: Mcgraw-hill Higher Education (us)
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Textbook Question
Chapter 4, Problem 25E
What is methane hydrate? Where is it found and why is great interest being shown in it?
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3.) The graph shows how current I varies with potential difference V across a component X.
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I/MA
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0+
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1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VIV
Component X and a cell of negligible internal resistance are placed in a circuit.
A variable resistor R is connected in series with component X. The ammeter reads 20mA.
4.0V
4.0V
Component X and the cell are now placed in a potential divider circuit.
(a) Outline why component X is considered non-ohmic. [1]
(b(i)) Determine the resistance of the variable resistor. [3]
(b(ii)) Calculate the power dissipated in the circuit. [1]
(c(i)) State the range of current that the ammeter can measure as the slider S of the potential divider
is moved from Q to P. [1]
(c(ii)) Describe, by reference to your answer for (c)(i), the advantage of the potential divider
arrangement over the arrangement in (b).
1.) Two long parallel current-carrying wires P and Q are separated by 0.10 m. The current in wire P is 5.0 A.
The magnetic force on a length of 0.50 m of wire P due to the current in wire Q is 2.0 × 10-s N.
(a) State and explain the magnitude of the force on a length of 0.50 m of wire Q due to the current in P. [2]
(b) Calculate the current in wire Q. [2]
(c) Another current-carrying wire R is placed parallel to wires P and Q and halfway between them as shown.
wire P
wire R
wire Q
0.05 m
0.05 m
The net magnetic force on wire Q is now zero.
(c.i) State the direction of the current in R, relative to the current in P.[1]
(c.ii) Deduce the current in R. [2]
2.) A 50.0 resistor is connected to a cell of emf 3.00 V. The voltmeter and the ammeter in the circuit are ideal.
V
A
50.00
(a) The current in the ammeter is 59.0 mA. Calculate the internal resistance of the cell.
The circuit is changed by connecting another resistor R in parallel to the 50.0 resistor.
V
A
50.00
R
(b) Explain the effect of this change on R is made of a resistive wire of uniform cross-sectional area 3.1 × 10-8 m²,
resistivity 4.9 × 10-70m and length L. The resistance of R is given by the equation
R = KL
where k is a constant.
(b.i) the reading of the ammeter. [2]
(b.ii) the reading of the voltmeter. [2]
(c) Calculate k. State an appropriate unit for your answer. [3]
[2]
Chapter 4 Solutions
Connect with LearnSmart for Krauskopf: The Physical Universe, 16e
Ch. 4 - In 2100 the number of people in the world is...Ch. 4 - Arrange these sources in the order of the energy...Ch. 4 - Of the following, the energy source likely to be...Ch. 4 - Prob. 4MCCh. 4 - Prob. 5MCCh. 4 - Prob. 6MCCh. 4 - Energy not ultimately derived from solar radiation...Ch. 4 - If present trends continue, an optimistic average...Ch. 4 - Prob. 9MCCh. 4 - Prob. 10MC
Ch. 4 - The radiation from an object at room temperature...Ch. 4 - The earths atmosphere is primarily heated by a....Ch. 4 - Prob. 13MCCh. 4 - Prob. 14MCCh. 4 - Prob. 15MCCh. 4 - Of the following fuels, the one that gives off the...Ch. 4 - Of the following fuels, the one that gives off the...Ch. 4 - Which of the following is not a fossil fuel? a....Ch. 4 - Prob. 19MCCh. 4 - The proportion of oil used by the United States...Ch. 4 - Most oil today is used for a. transportation b....Ch. 4 - Prob. 22MCCh. 4 - Prob. 23MCCh. 4 - The least polluting of the following fuels is a....Ch. 4 - Prob. 25MCCh. 4 - Prob. 26MCCh. 4 - The worst emitters of mercury, which damages the...Ch. 4 - Prob. 28MCCh. 4 - Of the following countries, the one that obtains...Ch. 4 - The proportion of electricity generated in the...Ch. 4 - In the relatively near future, the technology most...Ch. 4 - Prob. 32MCCh. 4 - Bright sunlight might deliver energy to an area of...Ch. 4 - The output of which of the following renewable...Ch. 4 - Prob. 35MCCh. 4 - Of the following technologies, the one that may...Ch. 4 - Of the following technologies, the one farthest...Ch. 4 - Biofuels based on which of the following seem to...Ch. 4 - Of the following, the strategy for coping with...Ch. 4 - Prob. 40MCCh. 4 - Population and Prosperity 1. What are the three...Ch. 4 - Energy Supply and Consumption 2. Even if the...Ch. 4 - The average rate of energy consumption per person...Ch. 4 - List the fossil fuels in the order in which they...Ch. 4 - Explain how sunlight is responsible for these...Ch. 4 - What energy sources cannot be traced to sunlight...Ch. 4 - Approximately what proportion of the worlds...Ch. 4 - (a) Give two reasons why global warming is causing...Ch. 4 - Once the polar ice sheets have melted beyond a...Ch. 4 - The oceans as well as the atmosphere are growing...Ch. 4 - When was the last time world temperatures were as...Ch. 4 - Every body of matter radiates light. What is...Ch. 4 - What is the nature of the greenhouse effect in the...Ch. 4 - Prob. 14ECh. 4 - Prob. 15ECh. 4 - (a) Why is deforestation so important in global...Ch. 4 - Prob. 17ECh. 4 - Prob. 18ECh. 4 - Most of the worlds oil is used as a fuel for what...Ch. 4 - Prob. 20ECh. 4 - Prob. 21ECh. 4 - What is the chief reason why the average fuel...Ch. 4 - Prob. 23ECh. 4 - Why is natural gas rarely used as a vehicle fuel?Ch. 4 - What is methane hydrate? Where is it found and why...Ch. 4 - Prob. 26ECh. 4 - Prob. 27ECh. 4 - Prob. 28ECh. 4 - Prob. 29ECh. 4 - Prob. 30ECh. 4 - What is the basic difference between nuclear...Ch. 4 - What role does uranium play in nuclear energy...Ch. 4 - How does a nuclear power plant produce...Ch. 4 - Explain why no nuclear power plants were planned...Ch. 4 - Prob. 35ECh. 4 - Prob. 36ECh. 4 - Prob. 37ECh. 4 - Prob. 38ECh. 4 - Prob. 39ECh. 4 - Give several reasons why fossil-fuel energy is...Ch. 4 - Prob. 41ECh. 4 - Prob. 42ECh. 4 - Prob. 43ECh. 4 - Prob. 44ECh. 4 - (a) What major advantage does geothermal energy...Ch. 4 - Prob. 46ECh. 4 - Prob. 47ECh. 4 - What are the advantages and disadvantages of...Ch. 4 - Prob. 49ECh. 4 - Prob. 50ECh. 4 - Prob. 51ECh. 4 - A major obstacle to a worldwide agreement on...Ch. 4 - Explain the cap-and-trade system for controlling...
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