Physics for Scientists and Engineers
10th Edition
ISBN: 9781337553278
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 30, Problem 20P
You are working in a factory that produces long bars of copper with a square cross section. In one section of the production process, the bars must slide down an inclined plane of angle θ. It has been found that the bars travel with too high a speed and become dented or bent when they arrive at the bottom of the plane and must be discarded. In order to prevent this waste, you devise a way to deliver the bars at the bottom of the plane at a lower speed. You replace the inclined plane with a pair of parallel metal rails, shown in Figure P30.19, separated by a distance ℓ. The smooth bars of mass m will slide down the smooth rails, with the length of the bar always perpendicular to the rails. The rails are immersed in a magnetic field of magnitude B, and a resistor of resistance R is connected between the upper ends of the rails. Determine the magnetic field necessary in your device so that the bars will arrive at the bottom of the plane with a maximum speed vmax.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
Astronomers using a 2.0-mm-diameter telescope observe a distant supernova−−an exploding star. The telescope's detector records 7.9 ×10-11 JJ of light energy during the first 10 s. It's known that this type of supernova has a visible-light power output of 6.0 ×1037 W for the first 10 s of the explosion.How distant is the supernova? Give your answer in light years, where one light year is the distance light travels in one year. The speed of light is 3.0 ×108 m/s
In free space, E (z, t) = 1.0 sin (ωt-βz)ax ,(v/m). Show that the average power passing through a circular disk with a radius of 15.5 m in the constant plane z= is 1W.
Haliade-X 12 MW is one of the most powerful offshore wind turbines in the world and it will be installed in the New Jersey offshore area (Figure 1). Energy storage is a long-time problem for wind energy, because the period of wind power is not necessary at the peak of electricity demand. To match the power supply and demand, the generated energy has to be stored either in battery or other forms.
There is an idea to use the tower of the wind turbine as energy storage – sea water is pumped to the top of the tower when power generation is more than demand; and water is released to drive a generator at the base of the tower to supply energy when it is needed. Assume the turbine tower is 20 m below the sea bottom and the water depth is 30 m, and the tower is filled by sea water (density = 1030 kg/m3). Answer the questions below (make sure your answer is in both gauge pressure and absolute pressure form).
At the mean sea level, how much is the pressure between inside and outside the…
Chapter 30 Solutions
Physics for Scientists and Engineers
Ch. 30.1 - A circular loop of wire is held in a uniform...Ch. 30.2 - In Figure 30.8a, a given applied force of...Ch. 30.3 - Figure 30.12 Figure 30.12 shows a circular loop of...Ch. 30.5 - Prob. 30.4QQCh. 30 - A circular loop of wire of radius 12.0 cm is...Ch. 30 - An instrument based on induced emf has been used...Ch. 30 - Scientific work is currently under way to...Ch. 30 - A long solenoid has n = 400 turns per meter and...Ch. 30 - An aluminum ring of radius r1 = 5.00 cm and...Ch. 30 - An aluminum ring of radius r1 and resistance R is...
Ch. 30 - A coil formed by wrapping 50 turns of wire in the...Ch. 30 - When a wire carries an AC current with a known...Ch. 30 - A toroid having a rectangular cross section (a =...Ch. 30 - A small airplane with a wingspan of 14.0 m is...Ch. 30 - A helicopter (Fig. P30.11) has blades of length...Ch. 30 - A 2.00-m length of wire is held in an eastwest...Ch. 30 - A metal rod of mass m slides without friction...Ch. 30 - Prob. 14PCh. 30 - Prob. 15PCh. 30 - An astronaut is connected to her spacecraft by a...Ch. 30 - You are working for a company that manufactures...Ch. 30 - You are working in a laboratory that uses motional...Ch. 30 - You are working in a factory that produces long...Ch. 30 - You are working in a factory that produces long...Ch. 30 - Within the green dashed circle show in Figure...Ch. 30 - Prob. 22PCh. 30 - Prob. 23PCh. 30 - Figure P30.24 (page 820) is a graph of the induced...Ch. 30 - The rotating loop in an AC generator is a square...Ch. 30 - In Figure P30.26, a semicircular conductor of...Ch. 30 - Prob. 27PCh. 30 - Suppose you wrap wire onto the core from a roll of...Ch. 30 - A rectangular loop of area A = 0.160 m2 is placed...Ch. 30 - A rectangular loop of area A is placed in a region...Ch. 30 - A circular coil enclosing an area of 100 cm2 is...Ch. 30 - Consider the apparatus shown in Figure P30.32: a...Ch. 30 - A guitars steel string vibrates (see Fig. 30.5)....Ch. 30 - Why is the following situation impossible? A...Ch. 30 - A conducting rod of length = 35.0 cm is free to...Ch. 30 - Magnetic field values are often determined by...Ch. 30 - The plane of a square loop of wire with edge...Ch. 30 - In Figure P30.38, the rolling axle, 1.50 m long,...Ch. 30 - Figure P30.39 shows a stationary conductor whose...Ch. 30 - Prob. 40APCh. 30 - Figure P30.41 shows a compact, circular coil with...Ch. 30 - Review. In Figure P30.42, a uniform magnetic field...Ch. 30 - An N-turn square coil with side and resistance R...Ch. 30 - A conducting rod of length moves with velocity v...Ch. 30 - A long, straight wire carries a current given by I...Ch. 30 - A rectangular loop of dimensions and w moves with...Ch. 30 - A thin wire = 30.0 cm long is held parallel to...Ch. 30 - An induction furnace uses electromagnetic...Ch. 30 - Prob. 49CPCh. 30 - A betatron is a device that accelerates electrons...Ch. 30 - Review. The bar of mass m in Figure P30.51 is...
Knowledge Booster
Learn more about
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
- The potential energy of two atoms in a diatomic molecule can be approximated by the Lennard- Jones potential U(r) = a/r¹² — b/r6, where r is the distance between the two atoms, and a and b are positive constants. a) Find the force F(r) on one of the atoms as a function of r. b) Find the equilibrium distance between the two atoms. Is this equilibrium stable? c) Suppose the distance between the two atoms is equal to the equilibrium distance found in part b). What minimum energy must be added to the molecule to break the two atoms apart? (This is called the dissociation energy of the molecule.)arrow_forwardA smooth circular hoop with a radius of 0.500 m is placed flat on the floor. A 0.400-kg particle slides around the inside edge of the hoop. The particle is given an initial speed of 8.00 m/s. After one revolution, its speed has dropped to 6.00 m/s because of friction with the floor. (a) Find the energy transformed from mechanical to internal in the particle–hoop–floor system as a result of friction in one revolution. (b) What is the total number of revolutions the particle makes before stopping? Assume the friction force remains constant during the entire motion.arrow_forwardA large hydroelectric power plant uses water from a reservoir to turn a generator. The water leaves the generator below the dam, 60 m below the level of the reservoir. The plant uses an 85% efficient generator to supply 1.0 GW of electricity. What mass of water flows through the plant each second?arrow_forward
- Water flows over a section of Niagara Falls at a rate of 1.30 × 106 kg/s and falls 52.0 m. What is the power dissipated by the waterfall?arrow_forwardArteriosclerotic plaques forming on the inner wall of arteries can decrease the effective cross-sectional area of an artery. Even small changes in the effective area of an artery can lead to very large changes in the blood pressure in the artery and possibly to the collapse of the blood vessel. Imagine a healthy artery, with blood flow velocity of vo equals 0.14 m/s and mass per volume of p = 1050 kg/m³. The kinetic energy per unit volume of blood is given pv². This is one of the terms in Bernoulli's equation. Imagine that plague has narrowed an artery to 1/10 of its normal cross-sectional area, a 90% blockage. 1 2 by ko = a) Compared to normal blood flow velocity, vo, what is the velocity of blood as it passes through this blockage? b) By what factor does the kinetic energy per unit of blood volume change as the blood passes through this blockage? c) Using Bernoulli's equation as the blood passes through this blockage, what happens to the blood pressure?arrow_forwardChapter 6, Section 6.6, Question 007 x Incorrect. A spring exerts a force of 24 N when it is stretched 0.3 m beyond its natural length. How much work is required to stretch the spring 0.6 m beyond its natural length? Enter the exact answer. [196035.38 W = exact number, no tolerancearrow_forward
- Your answer is partially correct. The loaded cab of an elevator has a mass of 3.60 × 10³ kg and moves 220. m up the shaft in 20.0 s at constant speed. At what average rate does the force from the cable do work on the cab? Number i 388.08 Units W Varrow_forward27.The potential energy function for either one of the two atoms in a diatomic molecule is often approximated by U (x)=-a/x¹² -b/x6 where x is the distance between the atoms. (a) At what distance of seperation does the potential energy have a local minimum (not at x = ¥)?(b) What is the force on an atom at this separation? (c) How does the force vary with the separation distance? Solution a. -2a b 1/6 ; b. 0; c. ~x6arrow_forwardWhich of the following statements is/are true? Check all that apply. The SI unit of power is the horsepower. The SI unit of power is the watt. A person is limited in the total work he or she can do by the rate at which energy can be transformed. Power is the rate at which energy is transformed. Power is the rate at which work is done. A person is limited in the total work he or she can do only by the total energy required.arrow_forward
- At a construction site, there is a pile of sand in the shape of a cone. The cone has a height of 5 m and a base radius of 8 m. Suppose that the density of the sand is 1400 kg/m3. In order to assemble this pile, energy must be expended to lift each bit of sand (working against gravity) to its final height in the pile. It is known that the energy, E required to lift a mass m (in kg) to a height h (in m) is given by E = mgh (where g can be taken to be 10 m/s2). How much energy is required in total to assemble the pile?arrow_forwardA 0.4 Gram mass is required to stretch a soap film confined in arectangular frame by 2mm downward before the film breaks. If the length of the movable bar is 2.5 cm, what will be the surface tension and change in surface free energy of the soap film?arrow_forwardThis time, the pendulum is 1.93 m long and has a mass of 3.17 kg. You give it a push away from vertical so that it starts swinging with a speed of 1.62 m/s. Due to friction at the pivot point, 1.00 Joule of the pendulum s initial kinetic energy is lost as heat during the upward swing. What maximum angle will it reach, with respect to the vertical, before falling back down? 18.7 degrees 21.5 degrees 31.8 degrees 26.7 degreesarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Length contraction: the real explanation; Author: Fermilab;https://www.youtube.com/watch?v=-Poz_95_0RA;License: Standard YouTube License, CC-BY