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Yogita Ingle 6 years, 3 months ago
- Escape velocity is the minimum velocity that a body must attain to escape the gravitational field of the earth.
- Suppose if we throw a ball,it will fall back. This is happening due to the force of gravitation exerted on the ball by the surface of the earth due to which the ball is attracted towards the surface of the earth.
- If we increase the velocity to such an extent that the object which is thrown up will never fall back.This velocity is known as escape velocity.
Shweta Dhama? 6 years, 3 months ago
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Yogita Ingle 6 years, 3 months ago
Pole strength is defined as the strength of a magnetic pole so as to attract magnetic materials towards itself. Pole strength is a scalar quantity.
| SI unit | N.Tesla-1 |
| Dimensions | [LA] |
Formula P = W/ I
Where,
- P is the Strength of the magnetic pole
- W is the work done while moving the magnet around the wire
- I is the electric current in the wire
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Yogita Ingle 6 years, 3 months ago
Heat Engines
- In a heat engine a body is configured to do work when placed in alternating contact with hot and cold bodies so that heat can be supplied and absorbed. In simple terms heat engine is a device which converts thermal energy to mechanical energy.
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Yogita Ingle 6 years, 3 months ago
Mayor 's Relationship:
By using 1st law of thermodynamics,
dQ=dU + pdv
If specific heat of a gas at constant volume
C = (dQ / dT)
C = dU / dT ...................(1 )
If specific heat capacity at constant pressure
C = (dQ / dT)
C = dU + Pdv / dT
C = dU / dT + P(dV / dT)
C C + Pdv / dT (using 1 ) ........................(2)
By applying ideal gas equation for 1 mole
PV = nRT
PV = (1)RT
PV = RT
P dv / dt = R dT / dt
Pdv = RdT
P(dv / dT) =R
Putting dis value in eq 2nd we get,
C - C = R
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Yogita Ingle 6 years, 3 months ago
- It is a curve between stress and strain.
- A graph is plotted between the stress (which is equal in magnitude to the applied force per unit area) and the strain produced.
- The graph helps us to understand how a given material deforms with increasing loads.
- The curve between O and A, is a straight line. This means stress is directly ∝ to strain. In this region Hooke’s Law is applicable.
- In this region the material behaves like an elastic body.
- In the region from A to B, stress and strain are not directly ∝. But still the material returns to its original dimension after the force is removed. They exhibit elastic properties.
- The point B in the curve is known as yield point (also known as elastic limit) which means till this point the material will be elastic in behaviour and the stress corresponding to point B is known as yield strength (Sy) of the material.
- The region between O and B is called as Elastic region.
- From point B to point D we can see that strain increases rapidly even for small change in stress.
- Even if we remove the force the material does not come back to its original position. At this point stress is zero but strain is not zero as body has changed its shape.
- The material has undergone plastic deformation.
- The material is said to be permanent set.
- The point D on the graph is known as ultimate tensile strength (Su) of the material.
- From D to E we can see that stress decreases even if strain increases.
- Finally at point E fracture occurs. This means the body breaks.
Posted by Harah Rai 6 years, 3 months ago
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Yogita Ingle 6 years, 3 months ago
- Statement of newton's third law of motion is " To every action there is always an equal and opposite reaction".
- Thus,whenever a body exerts force on another then another object exert an equal force on previous body but in opposite direction
- Force example motion of rocket depends on the third law of motion i.e, action and reaction .Rocket exerts action force on gas jet in backward direction
- Force of action and reaction acts on different objects i.e,
- Force object 1 exerts on object 2= Force object 2 exerts on object 1
- i.e,
- F12=-F21
- Action=-(Reaction)
- According to Newtonian mechanics force is always a mutual interaction between the bodies and force always occurs in pairs
- Equal and opposite mutual forces between two bodies is the basic idea between Newton's third law of motion
Posted by Pramesh Gurav 6 years, 3 months ago
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Gaurav Seth 6 years, 3 months ago
Explanation:
It is given that,
Force 1, F1 = 10 N (along +x axis)
Force 2, F2 = 15 N (along -x axis)
We need to find the resultant of two forces. Let the resultant is F. The angle between the both forces are 180 degrees. There resultant is given by :
F = f1 - f2
F = 10 N - 15 N
F = -5 N
So, the resultant force is 5 N in -x axis. Hence, this is the required solution.
Posted by Aman Pratap Singh Naruka 6 years, 3 months ago
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