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Syllabus

PLEASE EXPLAIN STRESS-STRAIN CURVE WITH THE HELP OF A GRAPH?

Density of a substance at 0/C is 10.6 gm/c.c and at 100/C is 10 gm/c.c coefficient of linear expansion of solid is?

1) 0.0006/C 2) 0.0004/C 3) 0.0003/C 4) 0.0002/C

Steel is more elastic than rubber.Explain?

The length of an elastic string is

rnx metrewhen the tension is8N,and Ym when the tension is. What is the length in metres when the tension is10N?18NPlease answer me fast tomorrow is my test

derive the formula for elastic potential energy for a stretched wire

state hooke's law

Q1.Two wires of same length & materials but different radii are suspended from a rigid support.both carry the same load.Will the stress,strain & extension in them be same or different.Justify your answer.

Q2.A wire stretches by a certain amount under a load.If the load & radius both are increased to 4 times.Find the strecth caused in the wire.

rand 2rare joined as shown in figure. If top end is fixed and lower end of cylinder B is twisted by angle ? Then angle of twist for cylinder A is (both cylinder have same length)A brass disc at 0 degree celsius has a diameter of 50 cm and a hole of diameter 10cm. For brass a=0.000018 degree celsius. When the disc is heated to 100 degree celsius, the diameter of the hole becomes?

1) 10.018cm 2) 10.180 cm 3)10.8cm 4)10.81cm

what is deforming force & restoring force?

A body is moving on a circle of radius 80m with a speed 20m/s which is decreasing at the rate of 5m/s

^{2}at an istant. What is the angle made by its acceleration with its velocity?For a rocket moving in free space, the fraction of mass to be disposed off to attain a speed equal to two times the exhaust speed is given by(e^2=7.4)

which is more elastic- rubber or steel.why?

What are the limitations of Hooke's law

Find the change in volume, which 1 m

^{3}of water will undergo when taken from the surface of bottom of sea 1 km deep. Given the elasticity of water is 20,000 atm.The length of a metal is l

_{1 }when the tension in it is T_{1 }and is l_{2 }when the tension is T_{2}. Find the original length of the wire.If mass of 4 kg is attached to the end of a vertical wire of length 4 m with a diameter 0.64 mm, the extension is 0.60 mm. Calculate the tensile stress and strain?

how does youngs modulus change with rise in temperature?

Q4. In the Searle's method to determine the Young's modulus of a wire, a steel wire of length 156 cm and diameter 0.054 cm is taken as experimental wire. The average increase in length for 1.5 kg wt is found to be 0.050 cm. Then the Young's modulus of the wire is

1) 3.002 × 10

^{11}N/m^{2}2) â€‹1.002 × 10^{11}N/m^{2}3) â€‹2.002 × 10

^{11}N/m^{2}4) â€‹2.5 × 10^{11}N/m^{2}Why steel has more elasticity than rubber?

5. There is a thin uniform disc of radius R and mass per unit area $\sigma $, in which a hole of radius R/2 has been cut out as shown in the figure. Inside the hole a square plate of same mass per unit area $\sigma $ is inserted so that its corners touch the periphery of the hole. Find the centre of mass of the system .

What will be the density of lead under a pressure of 2 x 10

^{8}Nm^{-2}?Given ,normal density of lead =11.4gcm^{-3}and bulk modulus of lead =8.0 x 10^{9}Nm^{-2}? Please reply soon !!!!!!!!!!!!(1) 8.4 (2) 84

(3) 92.4 (4) 168

What is percentage increase in the length of a wire of diameter 2.5 mm stretched by a force of 100 kg weight? youngs modulus of elasticity of wire is 12.5 * 10 to power 11 dyne / cm square

A metal bar 70 cm long and 4 kg in mass supported on two knife edges placed

10 cm from each end. A 6 kg load is suspended at 30 cm from one end. Find the reactions at the knife edges. Assume the bar to be of uniform cross section and

homogeneous.

Please solve this physics problem: The breaking stress of aluminium is 7.5 x 10

^{8}dyne/cm^{2}. If the density of aluminium is 2.7 g/cm^{3}, find the maximum of length of aluminium wire that can hang vertically without breaking.a crane having steel ropes is used to lift heavy load upto 10000 kg. the elastic limit for steel is 3*10^{8}N/m^{2}. what should be the radius r of the steel rope used?A material has Poisson 's ratio 0.50. If a unform rod of it suffers a longitudinal strain of 2x10^-3. Percentage change in volume is

Ans : ${C}_{1}=2\mu F\phantom{\rule{0ex}{0ex}}{C}_{2}=3\mu F$

what is the meaning of lateral strain

If work done in streching a wire by 1mm is 2J , the work necessary for streching another wire of same material, but with double the radius and half the enegy by 1mm in Joule is ?

There is a thin steel wire and a thick steel wire . Which has more youngs modulus ?

Why does a spring balance show wrong measure after a long use?

b) Yield point

c) Elastic limit

d) Breaking point

it is advised not to stand near a running train.why?

2 wires of same length and material but of different radii are suspended from rigid support. will stress, strain, extension be same or different?

Q-A copper wire of length 2.2m and a steel wire of length 1.6m, both of diameter 3.0mm, are connected end to end. When stretched by a load, the net elongation is found to be 0.70mm.Obtain the load applied.

One end of a nylonrope of length 4.5m and diameter 6mm is fixed to a free limb.A monkey weighing 100 Newtonjumps to catch the free end and says there.Find the elongation of the rope and corresponding change in diameter. Given Young's modulus of nylon=4.8*10raised to 11

1aur chaiyya kya

(5 marks)please explain using suitable diagram.

WHY BRIDGES ARE DECLARED UNSAFE AFTER LONG USE

6.

why does a railway track have a particular shape like I ?

7. A bottle has an opening of radius a and length b. A cork of length b and radius (a+$\u25b3$a) where ($\u25b3$a<<a) is compressed to fit into the opening completely (See figure). If the bulk modulus of cork is B and frictional coefficient between the bottle and cork is $\mu $ then the force needed to push the cork into the bottle is:

$\left(1\right)\left(\mathrm{\pi \mu B}\mathrm{b}\right)\u25b3\alpha \phantom{\rule{0ex}{0ex}}\left(2\right)\left(2\mathrm{\pi \mu B}\mathrm{b}\right)\u25b3\alpha \phantom{\rule{0ex}{0ex}}\left(3\right)\left(\mathrm{\pi \mu B}\mathrm{b}\right)\alpha \phantom{\rule{0ex}{0ex}}\left(4\right)\left(4\mathrm{\pi \mu B}\mathrm{b}\right)\u25b3\alpha $

1.youngs modulus of elasticity of a perfectly rigid body is

a.unity b.zero c.infinity d.none of these

2.bulk modulus of a perfectly rigid body is

a.unity b.zero c.infinite d.some finite small non-zero constant value

A force

rnthe length of wire of cross sectionF doubles. Then what is itsaYoung Modulus?Plz answer me soon

slowly from 2kg to 4kg, the elongation

increased from 0.5mm to 0.9mm. Find the

work done during the extension of the wire.

Explain why :

1) It is easier to pull a lawn roller ?

2) The maximum height of the mountain on the earth is not more than 10 K.M.?

One end of a rope of length 4.5 m and diameter 6 mm is fixed to a branch of a tree. A monkey is weighing 100 N jumps to catch the free end and stay there.Find the elongation of the rope

A wire suspended vertically from one of its ends is streched by attaching a weight of 200N to the lower end. The weight streches the wire by 1mm. The elastic energy stored in the wire is :

(A) 0.2 J

(B) 10 J

(C) 20J

(D) 0.1J

Can anyone derive this formula of shagging in a bridge:-

δ=Wl

^{3}/4Ybd^{3}Here Y=young's modulus

l=length

b=breadth of bridge

d=depth

others I think all know or who will attempt this will know!!!

^{}why are girders for supporting roofs made in the shape of I

1.Prove that Young's modulus of a wire is equal to the stress necessary to double its length.2.A sphere contracts in volume by 0.01% when taken to the bottom of the sea 1 km deep.Find the bulk modulus of the material of the sphere .Density of the water is 1000kg per metre cube.3.Calculate the increase in energy of a brass bar of length 0.2m and cross-sectional area 1 cm square when compressed with a force of 49N along its length.Young's modulus of brass is =1.0 * 10^{11}.4. If in a wire of young's modulus Y ,longitudinal strain X is produced ,what wiil be potential energy stored per unit volume?A wire elongates by 9mm when a load of 10kg is suspended from it. What is the elongation when it's radius is doubled, if all the other quantitites are as same as before?

Ans= 2.25 mm

HELP PLEASE! :O

(b) how does it affect the maximum load it can support without exceeding the elastic limit ?

Define Hydraulic Stress....!!!

^{2}and total un-stretched length 10 cm. It is stretched to 12 cm and then released to project a stone of mass 5 gm. Taking Young's modulus Y of rubber as 5 × 10^{8}N/m^{2}, the velocity of projection will be:(A) 20 cm/s (B) 20 m/s (C) 2 m/s (D) none of these

When the load on a wie is increased slowly from 2kg to 4kg , the elongation increases from 0.6 mm to 1.00 mm . How much work is done during the extension of the wire ?

on the basis of stress strain curve how can we distinguish between brittle, ductile, malleable curve.

which type of elasticity is involved in the following cases:

A composite wire of steel and copper of diameters 1 cm and length 2.2. m and 2m respectivly .total extension of the wire when streched by a force is 1.2mm calculate the force given that youngs modulus for copper is 1.1x10

^{11}and steel 2x10^{11}Pa.can experts please explain the stress strain curve in detail and in a simple understandable way please ?

A wire stretched by a certain amount under a load. If both lenght and diameter of the wire are doubled, the stretch produced by the same load what

Why steel is more elastic than rubber?

^{11}Pa and that for steel is 2.0x 10^{11}Pa