Physical Universe
16th Edition
ISBN: 9780077862619
Author: KRAUSKOPF, Konrad B. (konrad Bates), Beiser, Arthur
Publisher: Mcgraw-hill Education,
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Chapter 6, Problem 40E
To determine
The output power in hp.
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An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.
Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 828-kg electric car be able to supply to do the following?
(a) accelerate from rest to 25.0 m/s in 1.00 min
378.3
A.
(b) climb a 200-m high hill in 2.00 min at a constant 25.0 m/s speed while exerting 433 N of force to overcome air resistance and friction
1.94e3
In this case, 95% of the power supplied by the motor goes into increasing the potential energy and into the work done against air friction. How is work done related to the applied force and distance traveled? A
A refrigerator using 1030 W runs two-thirds of the time. How much does the electricity cost to run the refrigerator each month (30 days) at 26¢ per kWh?
Chapter 6 Solutions
Physical Universe
Ch. 6 - The charge on an electron a. is 1 C b. depends on...Ch. 6 - A positive electric charge a. attracts other...Ch. 6 - A positively charged rod is brought near an...Ch. 6 - Protons and electrons have different masses. When...Ch. 6 - Coulombs law for the force between electric...Ch. 6 - The electric force between a proton and an...Ch. 6 - An atom consists of a a. uniform distribution of...Ch. 6 - Prob. 8MCCh. 6 - An object has a positive electric charge whenever...Ch. 6 - A solid conductor is one a. whose electrons are...
Ch. 6 - Prob. 11MCCh. 6 - Match each of the electrical qualities listed...Ch. 6 - Electric power is equal to a. (current)(voltage)...Ch. 6 - The electric energy lost when a current passes...Ch. 6 - When a magnetized bar of iron is strongly heated,...Ch. 6 - All magnetic fields originate in a. iron atoms b....Ch. 6 - The force on an electron that moves in a curved...Ch. 6 - Magnetic field lines provide a convenient way to...Ch. 6 - In a drawing of magnetic field lines, the weaker...Ch. 6 - Prob. 20MCCh. 6 - Prob. 21MCCh. 6 - Prob. 22MCCh. 6 - Prob. 23MCCh. 6 - Prob. 24MCCh. 6 - Prob. 25MCCh. 6 - Prob. 26MCCh. 6 - Prob. 27MCCh. 6 - A generator is said to generate electricity. What...Ch. 6 - Prob. 29MCCh. 6 - Prob. 30MCCh. 6 - If 105 electrons are added to a neutral object,...Ch. 6 - A positive and a negative charge are initially 4...Ch. 6 - The force between two charges of 3 109 C that are...Ch. 6 - Five joules of work are needed to shift 10 C of...Ch. 6 - When the voltage across a certain resistance is V,...Ch. 6 - The voltage needed to produce a current of 5 A in...Ch. 6 - The resistance of a lightbulb that draws a current...Ch. 6 - The current in a 40-W, 120-V electric lightbulb is...Ch. 6 - A cars storage battery is being charged at a rate...Ch. 6 - A 120-V, 1-kW electric heater is mistakenly...Ch. 6 - A 240-V, 1-kW electric heater is mistakenly...Ch. 6 - Prob. 42MCCh. 6 - What reasons might there be for the universal...Ch. 6 - Electricity was once thought to be a weightless...Ch. 6 - A plastic ball has a charge of +1012 C. (a) Does...Ch. 6 - Why does the production of electricity by friction...Ch. 6 - Prob. 5ECh. 6 - Compare the basic characters of electric and...Ch. 6 - Find the total charge of 1 g of protons.Ch. 6 - Is there any distance at which the gravitational...Ch. 6 - When two objects attract each other electrically,...Ch. 6 - How do we know that the force holding the earth in...Ch. 6 - A hydrogen molecule consists of two hydrogen atoms...Ch. 6 - A charge of +2 107 C is 10 cm from a charge of 6 ...Ch. 6 - A charge of +3 109 C is 50 cm from a charge of 5 ...Ch. 6 - Two charges repel each other with a force of 0.1 N...Ch. 6 - Two charges originally 80 mm apart are brought...Ch. 6 - Two small spheres are given identical positive...Ch. 6 - (a) A metal sphere with a charge of +1 105 C is...Ch. 6 - Suppose the force between the earth and the moon...Ch. 6 - How far apart are two charges of +1 108 C that...Ch. 6 - How is the movement of electricity through air...Ch. 6 - One terminal of a battery is connected to a...Ch. 6 - Why do you think bending a wire does not affect...Ch. 6 - What basic aspect of superconductivity has...Ch. 6 - Sensitive instruments can detect the passage of as...Ch. 6 - (a) The capacity of a battery is usually quoted in...Ch. 6 - The energy stored in a certain 12-V battery is 3...Ch. 6 - The potential difference between a cloud and the...Ch. 6 - (a) A person can be electrocuted while taking a...Ch. 6 - How much current is drawn by a 240-V water heater...Ch. 6 - Prob. 30ECh. 6 - Prob. 31ECh. 6 - A fuse prevents more than a certain amount of...Ch. 6 - Should a fuse be connected in series or in...Ch. 6 - Heavy users of electric power, such as large...Ch. 6 - How are the terminals of a set of batteries...Ch. 6 - Prob. 36ECh. 6 - (a) If a 75-W lightbulb is connected to a 120-V...Ch. 6 - Prob. 38ECh. 6 - Prob. 39ECh. 6 - Prob. 40ECh. 6 - Prob. 41ECh. 6 - Prob. 42ECh. 6 - Prob. 43ECh. 6 - Prob. 44ECh. 6 - A 1.35-V mercury cell with a capacity of 1.5 A h...Ch. 6 - Prob. 46ECh. 6 - Prob. 47ECh. 6 - Prob. 48ECh. 6 - Prob. 49ECh. 6 - A current flows west through a power line. Find...Ch. 6 - Prob. 51ECh. 6 - Prob. 52ECh. 6 - Two parallel wires carry currents in the same...Ch. 6 - Prob. 54ECh. 6 - A current-carrying wire is in a magnetic field....Ch. 6 - Prob. 56ECh. 6 - Prob. 57ECh. 6 - Prob. 58ECh. 6 - Prob. 59ECh. 6 - Prob. 60ECh. 6 - Prob. 61ECh. 6 - Prob. 62ECh. 6 - Prob. 63ECh. 6 - Given a coil of wire and a small lightbulb, how...Ch. 6 - Prob. 65ECh. 6 - Prob. 66ECh. 6 - A transformer rated at a maximum power of 10 kW is...Ch. 6 - An electric welding machine uses a current of 400...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Integrated Concepts (a) What energy is dissipated by a lightning bolt having a 20,000-A current, a voltage of 1.00102 MV, and a length of 1.00 ms? (b) What mass of tree sap could be raised from 18.0°C to its boiling point and then evaporated by this energy, assuming sap has the same thermal characteristics as water?arrow_forwardIntegrated Concepts (a) Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 750-kg electric car be able to supply: (a) To accelerate from rest to 25.0 m/s in 1.00 min? (b) To climb a 2.00 102-m- high hill in 2.00 min at a constant 25.0-m/s speed while exerting 5.00 102 N of force to overcome air resistance and friction? (c) To travel at a constant 25.0-m/s speed, exerting a 5.00 102 N force to overcome air resistance and friction? See Figure 20.44.arrow_forwardA½ hp motor draws a current of 4.0 A from a 120-V line. (a) Calculate the electric power used by the motor. (b) Calculate the motor's efficiency - that is, the work it does per unit time divided by the electrical power it uses.arrow_forward
- Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 818-kg electric car be able to supply to do the following? (a) accelerate from rest to 25.0 m/s in 1.00 min (b) climb a 200-m high hill in 2.00 min at a constant 25.0 m/s speed while exerting 533 N of force to overcome air resistance and friction in Aarrow_forwardA refrigerator using 1030 W runs one-third of the time. How much does the electricity cost to run the refrigerator each month (30 days) at 29¢ per kWh?arrow_forwardAssuming 94.0% efficiency for the conversion of electrical power by the motor, what current (in A) must the 12.0 V batteries of a 755 kg electric car be able to supply in order to do the following? (a) to accelerate from rest to 25.0 m/s in 1.00 min A (b) to climb a 2.00 x 102 m high hill in 2.00 min at a constant 25.0 m/s speed while exerting 5.20 x 10² N of force to overcome air resistance and friction A (c) to travel at a constant 25.0 m/s speed, exerting a 5.20 x 10² N force to overcome air resistance and friction Aarrow_forward
- Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 833-kg electric car be able to supply to do the following? (a) accelerate from rest to 25.0 m/s in 1.00 min (A)(b) climb a 200-m high hill in 2.00 min at a constant 25.0 m/s speed while exerting 383 N of force to overcome air resistance and friction (A)arrow_forwardA battery can provide a current of 4.40 A at 2.00 V for 5.00 hr. How much energy (in kJ) is produced?arrow_forwardA heater is being designed that uses a coil of 14-gauge nichrome wire to generate 300 W using a voltage of V = 110 V . How long should the engineer make the wire?arrow_forward
- Assuming 89.0% efficiency for the conversion of electrical power by the motor, what current (in A) must the 12.0 V batteries of a 755 kg electric car be able to supply in order to do the following? (a) to accelerate from rest to 25.0 m/s in 1.00 min. A (b) to climb a 2.00 ✕ 102 m high hill in 2.00 min at a constant 25.0 m/s speed while exerting 5.10 ✕ 102 N of force to overcome air resistance and friction. A (c)to travel at a constant 25.0 m/s speed, exerting a 5.10 ✕ 102 N force to overcome air resistance and friction. Aarrow_forwardAssuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 750-kg electric car be able to supply: (a) To accelerate from rest to 25.0 m/s in 1.00 min? (b) To climb a 2.00×102 -m - high hill in 2.00 min at a constant 25.0-m/s speed while exerting 5.00×102 N of force to overcome air resistance and friction? (c) To travel at a constant 25.0-m/s speed, exerting a 5.00×102 N force to overcome air resistance and friction?arrow_forwardA 100 W electric bulb is used for 10 hours a day. How many units of energy are consumed in 30 days?arrow_forward
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