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. July 2019

Ray Optics: Refraction

Q- A ray of sunlight hits the ice on a frozen lake at a 560 angle of incident.

(a) At what angle does the refracted ray penetrate the water beneath the ice?

(b) What is the speed of light for the refracted beam in the water?   

(Refractive index: Ice 1.039, Water 1.333) 

Solution:

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Quantum Mechanics

Q- (a) What are the energies of the first three energy levels of an electron confined in a one-dimensional box of length 0.75 nm?

(b) How much energy must the electron lose to move from the n = 3 energy level to the n = 1 energy level?

(c) Suppose that an electron can move from the n = 3 level to …

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Force: Equilibrium

Q- (a) Draw the free-body diagram of the link at B.

(b) If the spring has a stiffness of k=800 N/m and an unstretched length of 100 mm, determine the tension in cables BC and BD when the spring is held in the position shown.

Solution:

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Thermodynamics

Q- A well-insulated rigid cylinder is divided into 2 compartments by a fixed conducting piston. Initially one side of the piston contains 1 m3 of O2 at 5 bar, 800C and the other side contains 1m3 of N2 at 7 bar, 200C.   Determine the final equilibrium temperature and pressure(s).

Solution: 

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Rotational Motion

Q- A solid wheel of mass 30 kg is rolled toward the left along a horizontal surface under the action of a horizontal force of magnitude 200 N, acting at the center of the wheel . If the friction is sufficient to prevent slipping, what is the magnitude of linear acceleration of the center of the whee…

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Current Electricity: Kirchhoff's Law

Q- Using mesh analysis, determine the current through R= 5Ω resistance and the potential Va.

Solution:

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