![Physics for Scientists and Engineers with Modern Physics](https://www.bartleby.com/isbn_cover_images/9781337553292/9781337553292_largeCoverImage.gif)
Concept explainers
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 a plane inclined at an angle θ = 21.0° to the horizontal. 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 = 2.00 m. The smooth bars of mass m = 1.00 kg 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 = 1.00 Ω 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 v = 1.00 m/s.
Figure P30.19 Problems 19 and 20.
![Check Mark](/static/check-mark.png)
Want to see the full answer?
Check out a sample textbook solution![Blurred answer](/static/blurred-answer.jpg)
Chapter 30 Solutions
Physics for Scientists and Engineers with Modern Physics
Additional Science Textbook Solutions
Conceptual Physical Science (6th Edition)
Tutorials in Introductory Physics
Essential University Physics: Volume 2 (3rd Edition)
Physics of Everyday Phenomena
Conceptual Physical Science Explorations
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
- 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? 6.6E+8 W 6.8E+7 W O 4.0E+7 W O 5.3E+8 W O 8.6E+6 Warrow_forwardAstronomers using a 2.0-m-diameter telescope observe a distant supernova−an exploding star. The telescope's detector records 7.9 × 10−11 J of light energy during the first 10 s. It's known that this type of supernova has a visible-light power output of 4.5 × 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.arrow_forwardit the minimum average power? 13. An energy-efficient fluorescent lightbulb operating at power Pı = 28 W can produce the same level of brightness as a conventional incandescent lightbulb operating at power P, 100 W. Lifetime of the energy-efficient bulb is T = 10000 h, and its purchase price is B1 = $4.50. Lifetime of the conventional bulb is T2 = 750 h, and its purchase price is B2 = $0.42. Suppose electrical energy costs R = $0.20/kWh, i.e. 20 cents per kilowatt- hour. a) Calculate the total cost of using energy-efficient bulbs over 10,000 hours. b) Calculate the total cost of using conventional bulbs over 10,000 hours. Note that you must include both the cost of purchasing the bulbs and the cost of energy.arrow_forward
- Using the data below please make a grapharrow_forwardAnswer questions 2, 3, and 4 only!!!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_forward
- given-Y=1.2 x 1011 N/m2arrow_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_forwardA copper wire is stretched by 0.5 % of its length. Calculate the energy stored per unit of its volume Y = 12 x 10¹0N/m².arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
![Text book image](https://www.bartleby.com/isbn_cover_images/9781133939146/9781133939146_smallCoverImage.gif)