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*, today in***examaffairstoday****IGNOU solved assignments 2108**section I bring you the ignou bsc solved assignments 2018. This post covers bsc physics solved assignments for**PHE-01/BPHE-101 Elementary Mechanics and PHE-02/BPHE-102 Oscillations and Waves**.
All answers are well versed and according to IGNOU pattern of answers which will help you in better preparation of IGNOU examination and coring good marks. So if you are a bsc student in ignou then you should download these solved assignment to get success. The download button is provided below.

**Before you download solved assignment let' have a look on important details:**

- Use only foolscap size writing paper (but not of very thin variety) for writing your answers.
- Leave 4 cm margin on the left, top and bottom of your answer sheet.
- Your answers should be precise.
- While solving problems, clearly indicate the question number along with the part being solved. Be precise. Write units at each step of your calculations as done in the text because marks will be deducted for such mistakes. Take care of significant digits in your work. Recheck your work before submitting it.
- This assignment will remain valid from January 1, 2018 to December 31, 2018. However, you are advised to submit it within 12 weeks of receiving this booklet to accomplish its purpose as a teaching tool. Answer sheets received after the due date shall not be accepted.

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**DOWNLOAD IGNOU SOLVED ASSIGNMENT FOR BSC (PHE-01/BPHE-101 Elementary Mechanics and PHE-02/BPHE-102 Oscillations and Waves)**

**Price: Rs.30 only**

**Tutor Marked Assignment**

**ELEMENTARY MECHANICS**

**Course Code: BPHE-101/PHE-01**

**Assignment Code: BPHE-101/PHE-01/TMA/2018**

**Max. Marks: 100**

**Note: Attempt all questions. Symbols have their usual meanings. The marks for each question are indicated against it.**

**1.**A crate of mass 30.0 kg is pulled by a force of 1800 N up an inclined plane which makes an angle of 30Âº with the horizon. The coefficient of kinetic friction between the plane and the crate is Âµk = 0.225. If the crates starts from rest, calculate its speed after it has been pulled 15.0 m. Draw the free body diagram. (10)

**2.**A ball having a mass of 0.5 kg is moving towards the east with a speed of 8.0 ms-1 . After being hit by a bat it changes its direction and starts moving towards the north with a speed of 6.0 ms−1 . If the time of impact is 0.1 s, calculate the impulse and average force acting on the ball. (10)

**3.**A box of mass 8.0 kg slides at a speed of 10 ms−1 across a smooth level floor before it encounters a rough patch of length 3.0 m. The frictional force on the box due to this part of the floor is 70 N. What is the speed of the box when it leaves this rough surface? What length of the rough surface would bring the box completely to rest? (10)

**4.**A wheel 2.0 m in diameter lies in the vertical plane and rotates about its central axis with a constant angular acceleration of 4.0 rad s−2 . The wheel starts at rest at t = 0 and the radius vector of a point A on the wheel makes an angle of 60Âº with the horizontal at this instant. Calculate the angular speed of the wheel, the angular position of the point A and the total acceleration at t = 2.0s. (10)

**5.**A horizontal rod with a mass of 10 kg and length 12 m is hinged to a wall at one end and supported by a cable which makes an angle of 30Âº with the rod at its other end. Calculate the tension in the cable and the force exerted by the hinge. (10)

**6.**A girl is sitting with her dog at the left end of a boat of length 10.0 m. The mass of the girl, her dog and the boat are 60.0 kg, 30.0 kg and 100.0 kg respectively. The boat is at rest in the middle of the lake. Calculate the centre of mass of the system. If the dog moves to the other end of the boat, the girl staying at the same place, how far and in what direction does the boat move? (10)

**7.**A child of mass 50 kg is standing on the edge of a merry go round of mass 250 kg and radius 3.0 m which is rotating with an angular velocity of 3.0 rad s−1 . The child then starts walking towards the centre of the merry go round. What will be the final angular velocity of the merry go round when the child reaches the centre? (10)

**8.**At a crossing a truck travelling towards the north collides with a car travelling towards the east. After the collision the car and the truck stick together and move off at an angle of 30 Âº east of north. If the speed of the car before the collision was 20 ms−1 , and the mass of the truck is twice the mass of the car, calculate the speed of the truck before and after the collision. (10) 4

**9.**Titan, a satellite of Saturn, has a mean orbital radius of 1.22 × 109 m. The orbital period of Titan is 15.95 days. Hyperion, another satellite of Saturn, orbits at a mean radius of 1.48 × 109 m. Estimate the orbital period of Hyperion. (10)

**10. a)**What should be the angular velocity of the earth such that a person of mass 80 kg standing on the earth at the equator would actually fly off the earth? (5)

b) A ball of mass 60g is moving due south with a speed of 50 ms−1 at latitude 30ÂºN. Calculate the magnitude and direction of the coriolis force on the ball. Compare the magnitude of this force to the weight of the ball. (5)

**Tutor Marked Assignment**

**OSCILLATIONS AND WAVES**

**Course Code: BPHE-102/PHE-02**

**Assignment Code: BPHE-102/PHE-02/TMA/2018**

**Max. Marks: 100**

**Note: Attempt all questions. Symbols have their usual meanings. The marks for each question are indicated against it. Your answers to descriptive questions should be in your own words.**

**1. a)**The amplitude of an oscillator is 8 cm and it completes 100 oscillations in 80s.

**i)**Calculate its time period and angular frequency.

**ii)**If the initial phase is Ï€/4, write expressions for its displacement and velocity.

**iii)**Calculate the values of maximum velocity and acceleration. (2+4+4)

**b)**A body of mass 0.15 kg executes SHM described by the equation x(t) = 2sin(Ï€t + Ï€ )4/ where x is in meters and t is in seconds.

**i)**Determine the amplitude and time period of the oscillation.

**ii)**Calculate the initial values of displacement and velocity.

**iii)**Calculate the values of time when the energy of the oscillator is purely kinetic. (2+4+4)

**2. a)**What is the effect of damping in an oscillatory system? Differentiate between heavy and critical damping. Show that the displacement of a weakly damped oscillator is given by

( ) exp( ) cos( x t = a0 −bt Ï‰d t − Ï†

where symbols have their usual meanings. (2+3+5)

**b)**The equation of motion of a damped harmonic oscillator is given by

2 0 2 0 2 2 + + Ï‰ x = dt dx b dt d x

with 25.0 kg, 14.0 s and 18 s 4.

Calculate i) the time period; ii) number of oscillations in which its amplitude will become half of its initial value; and iii) number of oscillations in which its mechanical energy will reduce to half of its initial value. (3+3+4)

**3. a)**Giving the necessary mathematical expressions, discuss the transient and steady state of a weakly damped forced oscillator. Show that the average power absorbed by a forced oscillator is given by

**b)**What do you understand by the normal modes of a coupled oscillator? If a coupled system has many normal modes, do all normal modes have the same frequency? In a 4 solid, the speed of elastic longitudinal wave is 35.1 ms . −1 If the Young’s modulus of elasticity of the solid is 2 10 N m , 11 −2 × calculate its mass density. (3+2+5)

**4. a)**A sinusoidal wave is described by y(x,t) = 0.3 sin (5.95t − 4.20x cm ) where x is the position along the wave propagation. Determine the amplitude, wave number, wavelength, frequency and velocity of the wave. (2×5=10)

**b)**Two waves, travelling along the same direction, are given by y x t a ( t k x) 1 1 1 ( , ) = sin Ï‰ − and y x t a ( t k x) 2 2 2 ( , ) = sin Ï‰ − Suppose that the values of Ï‰1 and 1 k are respectively slightly greater than Ï‰2 and 2 k . i) Obtain an expression for the resultant wave due to their superposition. ii) Explain the formation of wave packet. (5+5)

**5. a)**An ambulance siren has frequency 250 Hz. The ambulance is headed towards an accident site with a speed of 90 km h . −1 Two police officers on separate motor cycles head for the same accident site: one follows the ambulance with a speed of 80 km h−1 and the other approaches the accident site from the other direction with a speed of 80 km h−1 . What frequency does ambulance siren has for each of the police officers? Take the speed of sound equal to 340 ms−1 . (5+5)

**b)**A harmonic wave on a rope is described by + Ï€ = − ((10ms ) )] 0.82 m 2 ( , ) 0.4( mm)sin 1 y x t t x i) Calculate the wavelength and time period of the wave. ii) Determine the displacement and acceleration of the element of the rope located at x = 0.58 m at time, t = 41.0 s. (4+6)

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****DOWNLOAD IGNOU SOLVED ASSIGNMENT FOR BSC (PHE-01/BPHE-101 Elementary Mechanics and PHE-02/BPHE-102 Oscillations and Waves)**

**Price: Rs.30 only**

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