(a)
The tension in the wire.
(a)
Answer to Problem 72CP
The tension in the wire is
Explanation of Solution
Write the equation length under tension for steel.
Here,
Write the equation length under tension for copper.
Here,
Write the equation length at
Here,
Write the equation length at
Here,
Write the equation cross-sectional area for steel.
Here,
Write the equation cross-sectional area for copper.
Here,
Write the expression of tension force from equation (I) and (II).
Conclusion:
Substitute
Substitute
Substitute
Substitute
Substitute
Thus, the tension in the wire is
(b)
The x-coordinate of the junction between the wires.
(b)
Answer to Problem 72CP
The x-coordinate of the junction between the wires is
Explanation of Solution
Write the equation for the x-coordinate by using equation (I).
Here,
Conclusion:
Substitute
Thus, the x-coordinate of the junction between the wires is
Want to see more full solutions like this?
Chapter 19 Solutions
Bundle: Physics for Scientists and Engineers with Modern Physics, Loose-leaf Version, 9th + WebAssign Printed Access Card, Multi-Term
- An electric coffeemaker has a 610-W heating element. The specific heat of water is 4.19 × 103 J/(kg⋅°C). How long, in seconds, does it take the coffeemaker to heat 0.76 L of water from 18°C to 88°C, assuming all the heat produced by the heating element goes into the water?arrow_forwardSuppose you have a filling in one of your teeth, and, while eating some ice cream, you suddenly realize that the filling came out. One of the reasons the filling may have become detached from your tooth is the defferential contraction of the filling relative to the rest of the tooth due to the temperature change. (a) Find the change in volume for a metallic dental filling due to the difference between body temperature (37.0 degrees Celsius) and the temperature of the ice cream you ate (-6.2 degrees Celsius). The initial volume of the filling is 39.0 mm^3 , and its expansion coefficient is alpha = 42.0 x 10^-6/K (answer in cubic mm) (b) The change in volume for a metallic dental filling is due to the difference between body temperature (37.0 degrees Celsius) and the temperature of the ice cream you ate (-6.2 degrees Celsius). The initial volume of the filling is 39.0 mm^3 , and the expansion coefficient of the tooth is alpha = 17.0 x 10^-6/K. Find the change in volume of the cavity.arrow_forwardThe table below gives the results of measuring the electrical conductivity C of glass at temperature T degrees Fahrenheit. 86 148 166 188 202 210 0.004 0.018 0.029 0.051 0.073 0.090 Use regression to find the exponential function C=ae bT that will satisfy the given table. Find the value of Cif T = 197.1.arrow_forward
- The temperature of the filament of a 100 W electric lamp is 2727 °C. The emissvity of the surface of the filament is 0.086 and its radius is 0.5 mm. Find the length of the filament. O = 5.7 x 108 S.I. units.arrow_forwardA student is trying to decide what to wear.His bedroom is at 20.0 degrees Celcius.His skin Temperature is 25 degrees Celsius.The area of his exposed skin is 1.50 square mitres.People all over the world have dark skin with emessivity about 0.900.Find the net energy transfer from his body by radiation in 10.0 minutesarrow_forwardThe changes in the sleep cycle of a graduate student due to thepandemic causes him to become rather careless. One day, he forgets to turn off the cylindrical electric heater in a chemical laboratory after he is done using it to prepare an aqueous glucose solution. The temperature in the laboratory is 22 °C, and the energy transfer to the heater is 350 W. The diameter of the heater is 20 cm. Determine the surface temperature of the heater. Will this temperature of the heater change over time? Why, or why not? If the temperature of the heater does not change over time, determine the value of this temperature. If the temperature of the heater changes over time, determine the final value of this temperature.arrow_forward
- Hava boşluğunda yarıçapı r=9 cm olan iki iletken küre x=-0.8 m ve x=0.8 m noktasına konmuştur. Küreler arasında oluşan kapasitansı bulunuz. Two conductive spheres with a radius of r=9 cm in the air gap are placed at the point x=-0.8 m and the point x=0.8 m. Find the capacitance that occurs between the globes m=3,1416 y Xarrow_forwardA copper wire has a cross section of 2.5 mm^2 and a length of 2 meters. What is the electrical resistant at 20 degrees Celsius?arrow_forwardWater flows through a shower head steadily at a rate of 10 L/min. An electric resistance heater placed in the water pipe heats the water from 16 to 43°C. Taking the density of water to be 1 kg/L, determine the electric power input to the heater, in kW. In an effort to conserve energy, it is proposed to pass the drained warm water at a temperature of 39°C through a heat exchanger to preheat the incoming cold water. If the heat exchanger has an effectiveness of 0.50 (i.e., it recovers only half of the energy that can possibly be transferred from the drained water to incoming cold water), determine the electric power input required in this case. If the price of the electric energy is 11.5 ¢/kWh, determine how much money is saved during a 10-min shower as a result of installing this heat exchanger.arrow_forward
- 17.26 · In an effort to stay awake for an all-night study session, a student makes a cup of coffee by first placing a 200-W electric immersion heater in 0.320 kg of water. (a) How much heat must be added to the water to raise its temperature from 20.0°C to 80.0°C? (b) How much time is required? ASsume that all of the heater's power goes into heating the water.arrow_forwardA classroom has dimensions 8.00 m x 10.00 m x 3.00 m. A 1000 W electric space heater is being used to warm the room from 5.00°C to 20.00°C on a cold morning. If the density of air is 1.29 kg/m°, and the specific heat capacity of air is 1004 J/(kg-K), how long will it take to heat the room? Assume no loss of thermal energy to the surroundings. A) 1.30 minutes B) 241 minutes C) 45.3 minutes O D) 77.7 minutesarrow_forwardA piece of copper tubing used in plumbing has a length of 54.0 cm Question 1. and an inner diameter of 1.25 cm at 22.0°C. When hot water at 95.0°C flows through the tube, what are (a) the tube's new length and (b) the change in its cross-sectional area? (c) if the density of copper is 8.92 x 103 kg/m³ at 22.0°C, find its density at 95.0°Carrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning