
Concept explainers
(a)
To Calculate:The thermal resistance of each cube.
(a)

Answer to Problem 36P
Thermal resistance of copper cube is 0.0831 K/W.
Thermal resistance of aluminum cube is 0.141 K/W.
Explanation of Solution
Given: A copper cube and aluminum cube each having3.00cm long edges.
Formula used:
Thermal resistance
Calculation:
Thermal resistance of copper cube is calculated as follows:
Substitute 3 cm for,
Therefore, thermal resistance of copper cube is 0.0831 K/W.
Thermal resistance of aluminum cube is calculated as follows:
Substitute 3 cm for
Therefore, thermal resistance of aluminum cube is 0.141 K/W
Conclusion: Thermal resistance can be calculated by using heat conductivity.
(b)
To Calculate:The thermal resistance of two cube combination.
(b)

Answer to Problem 36P
The thermal resistance of two-cube combination is 0.224 K/W.
Explanation of Solution
Given:
Cubes are connected in series.
A copper cube and aluminum cube each has 3.00cm long edges.
0.0831 K/W for
Calculation:
The cubes are in series, so the resultant thermal resistance is:
Substitute 0.0831 K/W for
Conclusion: Thus, the thermal resistance of two-cube combination is 0.224 K/W.
(c)
To Calculate:The thermal current I.
(c)

Answer to Problem 36P
Thermal current I at the interface between the two cubes is 0.375 kW.
Explanation of Solution
Given: A copper cube and aluminum cube each has 3.00cm long edges.
Calculation:
The expression for the thermal current I is
Here, ΔT is the difference in temperature and Req is the equivalent resistance.
Substitute the values
Conclusion:
Therefore, thermal current I at the interface between the two cubes is 0.375 kW.
(d)
To Calculate:The temperature at the interface of two cubes.
(d)

Answer to Problem 36P
Explanation of Solution
Given:
I = 357 W
Calculation:
The temperature at the interface between the two cubes is
Substitute
Conclusion: Therefore, the temperature at the interface between the two cubes is
Want to see more full solutions like this?
Chapter 20 Solutions
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
- simple diagram to illustrate the setup for each law- coulombs law and biot savart lawarrow_forwardA circular coil with 100 turns and a radius of 0.05 m is placed in a magnetic field that changes at auniform rate from 0.2 T to 0.8 T in 0.1 seconds. The plane of the coil is perpendicular to the field.• Calculate the induced electric field in the coil.• Calculate the current density in the coil given its conductivity σ.arrow_forwardAn L-C circuit has an inductance of 0.410 H and a capacitance of 0.250 nF . During the current oscillations, the maximum current in the inductor is 1.80 A . What is the maximum energy Emax stored in the capacitor at any time during the current oscillations? How many times per second does the capacitor contain the amount of energy found in part A? Please show all steps.arrow_forward
- A long, straight wire carries a current of 10 A along what we’ll define to the be x-axis. A square loopin the x-y plane with side length 0.1 m is placed near the wire such that its closest side is parallel tothe wire and 0.05 m away.• Calculate the magnetic flux through the loop using Ampere’s law.arrow_forwardDescribe the motion of a charged particle entering a uniform magnetic field at an angle to the fieldlines. Include a diagram showing the velocity vector, magnetic field lines, and the path of the particle.arrow_forwardDiscuss the differences between the Biot-Savart law and Coulomb’s law in terms of their applicationsand the physical quantities they describe.arrow_forward
- Explain why Ampere’s law can be used to find the magnetic field inside a solenoid but not outside.arrow_forward3. An Atwood machine consists of two masses, mA and m B, which are connected by an inelastic cord of negligible mass that passes over a pulley. If the pulley has radius RO and moment of inertia I about its axle, determine the acceleration of the masses mA and m B, and compare to the situation where the moment of inertia of the pulley is ignored. Ignore friction at the axle O. Use angular momentum and torque in this solutionarrow_forwardA 0.850-m-long metal bar is pulled to the right at a steady 5.0 m/s perpendicular to a uniform, 0.650-T magnetic field. The bar rides on parallel metal rails connected through a 25-Ω, resistor (Figure 1), so the apparatus makes a complete circuit. Ignore the resistance of the bar and the rails. Please explain how to find the direction of the induced current.arrow_forward
- For each of the actions depicted, determine the direction (right, left, or zero) of the current induced to flow through the resistor in the circuit containing the secondary coil. The coils are wrapped around a plastic core. Immediately after the switch is closed, as shown in the figure, (Figure 1) in which direction does the current flow through the resistor? If the switch is then opened, as shown in the figure, in which direction does the current flow through the resistor? I have the answers to the question, but would like to understand the logic behind the answers. Please show steps.arrow_forwardWhen violet light of wavelength 415 nm falls on a single slit, it creates a central diffraction peak that is 8.60 cm wide on a screen that is 2.80 m away. Part A How wide is the slit? ΟΙ ΑΣΦ ? D= 2.7.10-8 Submit Previous Answers Request Answer × Incorrect; Try Again; 8 attempts remaining marrow_forwardTwo complex values are z1=8 + 8i, z2=15 + 7 i. z1∗ and z2∗ are the complex conjugate values. Any complex value can be expessed in the form of a+bi=reiθ. Find θ for (z1-z∗2)/z1+z2∗. Find r and θ for (z1−z2∗)z1z2∗ Please show all stepsarrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College





