SAEED MDCAT
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Work is __________ quantity
If F = 2i + 3j and d= 7k then amount of work done will be
W = F . d = (2i + 3j) . (7k) = 0 J
W = F . d = (2i + 3j) . (7k) = 0 J
The work done can also be calculated by the area under
Area under Fd graphs shows work done.W = Fxd
Area under Fd graphs shows work done.W = Fxd
A force F = 3i+2j+4k N gives displacement of 10j m. The work done is
W= F . d = (3i+2j+4k) . 10j = 20 J
W= F . d = (3i+2j+4k) . 10j = 20 J
If a mass of 5kg is lifted upto 5 m height then work done against gravity will be
Work done = mgh = 5x10x5=250J
Work done = mgh = 5x10x5=250J
Work done on a body equals to change in its
work energy principle
work energy principle
The relationship between force and position is shown in figure (in one dimensional case). The work done by the force in displacing a body from x = 1 cm to x = 5 cm is
Work done = (10 + 20 + 10) –20 = 20 ergs
Work done = (10 + 20 + 10) –20 = 20 ergs
A force of N gives displacement m work done is
W = F.d
W = F.d
If a body of weight w is lifted through a height ‘h’ from ground, then the work done by the gravity will be
Total work done in figure
Work done in closed path is zero
Work done in closed path is zero
A 1kg mass has a K.E of 1J when its speed is
If momentum is increased by two times K.E increases by
When work done by gravitational field is negative then P.E of the system.
When a body is raised in height then work by gravitational field becomes negative. As height increases so P.E increases.
When a body is raised in height then work by gravitational field becomes negative. As height increases so P.E increases.
A car accelerates up a hill what happens to its K.E and to its P.E respectivelyKinetic EnergyPotential EnergyIncreases DecreasesDecreasesIncreasesIncreasesIncreasesUnchangedIncreases
As the height increases so the P.E also increases, in this case as a car is moving towards height, then driver has to accelerate the car more to move towards height due to which car speeds up, so its K.E also increases.
As the height increases so the P.E also increases, in this case as a car is moving towards height, then driver has to accelerate the car more to move towards height due to which car speeds up, so its K.E also increases.
A 2m tall man standing at a top of a 30m tall tower raises a 1kg mass 0.5m above his head. The potential energy of the raised mass may be consider to be
If a body raised up from the earth’s surface, the work done equal to change in the:
Work done = (in gravitational field)Work done = G.P.E
Work done = (in gravitational field)Work done = G.P.E
When we raise the body above the surface of the earth its P.E within the gravitational field.
As Gravitational potential energy = mghBy raising height increases so G.P.E increases.
As Gravitational potential energy = mghBy raising height increases so G.P.E increases.
Which of the following graphs is correct between kinetic energy (E), potential energy (U) and height (h) from the ground of the particle
Potential energy increases and kinetic energy decreases when the height of the particle increases it is clear from the graph.
Potential energy increases and kinetic energy decreases when the height of the particle increases it is clear from the graph.
The diagrams represent the potential energy U of a function of the interatomic distance r. Which diagram corresponds to stable molecules found in nature.
When the distance between atoms is large then interatomic force is very weak. When they come closer, force of attraction increases and at a particular distance force becomes zero. When they are further brought closer force becomes repulsive in nature. This can be explained by slope of U−xcurve shown in graph .
When the distance between atoms is large then interatomic force is very weak. When they come closer, force of attraction increases and at a particular distance force becomes zero. When they are further brought closer force becomes repulsive in nature. This can be explained by slope of U−xcurve shown in graph .
The graph between E and v is
Kinetic energyE=1/2mv2ÞE∝ v2graph will be parabola symmetric to Eaxis.
Kinetic energyE=1/2mv2ÞE∝ v2graph will be parabola symmetric to Eaxis.
How much water a pump of 2 kW can raise in one minute to a height of 10 m (Take g = 10 ms–2)
Power of 2238 watt in horse power is
Power in Hp
Power in Hp
The time taken by an engine of power 10 kW to lift a mass of 200 kg to the height of 40 m is
A horse pulls a wagon with a force of 360 N at an angle of 60° E with the horizontal at a speed of 10 km h–1. The power of the horse is
A motor drives a body along a straight line with a constant force. The power P developed by the motor must vary with time t according to
As
As
A bucket full of water having mass of 1000 kg is taken upto height of 10m in 10 seconds. What is the power developed?
One kilo watt hour is the amount of work done in
where P = kilowatt and t = 1 hour
where P = kilowatt and t = 1 hour
The dimension of power is
Slope of work time graph is equal to
Two men with weights in the ratio 5 : 3 run up a staircase (of same height) in times in the ratio 11 : 9. The ratio of power of first to that of second is:
A automobile travelling with a speed of 60 km h–1, can brake to stop within a distance of 20 m. If the car is going twice as fast i.e., 120 km h1, the stopping distance will be
Since v is doubled therefore S is increased by a factor of 4.
Since v is doubled therefore S is increased by a factor of 4.
A force of 10N acts on a body at angle such that K.E of body increases to from . What is the work done by the force?
By work energy principle
By work energy principle
A body of mass 4kg is moving with a velocity of 4m/sec. How much force is required to stop the body with in a distance of one meter
Negative sign is for retarding force.
Negative sign is for retarding force.
A lorry and a car moving with same kinetic energy are brought to rest by the application of brakes which provide equal retarding force. Which of them comes to rest in shorter distance?
Loss in K.E.=work done against friction As kinetic energy and force F are same; so stopping distance s is same
Loss in K.E.=work done against friction As kinetic energy and force F are same; so stopping distance s is same
The actual efficiency of machine is
any machine can not having equal or greater than 100% efficiency
any machine can not having equal or greater than 100% efficiency
The effciency of patrol heat engine is
A machine needed 1000 J of energy to raise a 10 kg block at a distance of 6 m, the efficiency of machine is
The efficiency of ideal machine
If a machine moves a load W through a distance h then the useful work done by the machine is
Block and tackle system of pulleys is used to raise a load of 500N through a height of 20 m. The work done against friction is 2000J. Calculate the work done by the effort.
total work = (weight x height) + work done against friction = (500 x 20 ) + 2000 = 12000 J
total work = (weight x height) + work done against friction = (500 x 20 ) + 2000 = 12000 J
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Things ___on heating and contract on cooling.
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The train __at seven twentythree tomorrow morning.
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You ________ so kind to me.
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One day people ______ to Mars.
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You already _____ a lot for me.
Choose the correct option.I _______ really tired for a whole week now.
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I _________ late for work.
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You ________ a puppy, would you?
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I love this film. I think it’s the fourth time I _________ it.
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This year is the period which began in January and has __________up to the present time.
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He______ in hospital since his accident.
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I ______ a few days before she died.
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At 6 o’clock, I _______ dinner.
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He was busy packing, for he ________ that night.
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He ______ wait till we had finished our meal.
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It was only the second opera I _____ in my life.
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She ______ to telephone her mother all day.
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Spring ______ again.
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It’s no good, is it?
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I ______ an exam in the coming October.
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While I ____ for the bus, I'll drink my coffee.
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Don’t forget, _______.
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There is little we ______ about it, is there?
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After you _______ the police, what did you do?
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_________ six emails since lunchtime.
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I ______about you all day.
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Once upon a time a princess ____ in love with a farmer.
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Some people think that Shakespeare a lot in Germany.
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I ______ my new job tomorrow.
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There goes our bus daily.
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