SAEED MDCAT
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How much time will be required to perform 520 J of work at the rate of 20 W?
Which of the followings is an example of work done against gravitational force?
In an explosion a body breaks up into two pieces of unequal masses. In this:
What happens to the kinetic energy of a moving object if the net work done is positive?
The dot product of force and velocity is equal to:
Which statement best represents the principle of conservation of energy?
To travel at a constant speed, a car engine provides 24 KW of useful power. The driving force on the car is 600N at what speed does it travel,
A toy car moves of mass 5kg up a ramp under the influence of force F plotted against displacement. The maximum height attained is given by
A mass m is thrown vertically upward into air with initial speed u. A constant force F due to air resistance acts on the mass during its travel. Taking into account the work done against air drag the maximum distance covered by the mass to reach the top is
A body of mass m is accelerated uniformly from rest to a speed v in a time T. The instantaneous power delivered to the body as a function of time is
When two bodies collide elastically then the quantity conserved is
In the presence of air friction, the relation for free falling body is
A car weighing 1 tone is moving twice as fast as another car weighing 2 tons. The K.E of the one ton car is
A force of 10N acts on a body moving with constant velocity for a distance of 10m. What is the work done by friction if body remains in equilibrium?
The input power to a motor is 300 W. In 20s it lifts a load of 400 N through a height of 6.0 m. What is the efficiency of the motor?
A bicycle dynamo is started at time zero. The total energy transformed by the dynamo
during the first 5 seconds increases as shown in the graph
What is the maximum power generated at any instant during these first 5 second?
A 70 kg man runs up a long flight of stairs in 4.0s. The vertical height of the stairs is 4.5 m. Calculate his power output in watts.
Force 100N is applied on a wire produces extension 5mm in it. Energy stored in it is
A long spring is stretched by 2cm. its P.E is V. If the spring is stretched by 10cm, its P.F would be
A force of N gives displacement m work done is
A trolley runs from P to Q along a track. At Q, its potential energy is 50 KJ less than at P.
At P the kinetic energy of the trolley is 5 KJ. Between P and Q the work trolley does against friction is 10 KJ. What is the kinetic energy of the trolley at Q?
The source of energy from tides has its original source
The work done in raising a mass of 15 gm from the ground to a table of 1m height is
A car of mass 1000 kg moving on a horizontal road with a steady speed of 10 m/sec has total frictional force on it of 400 N. The power due to engine is
A boat is moving at constant speed V through still water experiences frictional drag F what is power deliver
A body of mass 2kg is being rotated in a circle by 0.5m long string. The work done by centripetal force is
A body of 5 kg has P.E of 98J its height is
A force F acting on an object varies with distance X as shown in fig.
Calculate the total work done by the force
What will be the speed of electron having an energy of 18.2 x 1017 Joule?
When arrow is released form its bow, its energy is transformed from
Electron, proton, deuterium and particle have same K.E. Which of them has highest momentum?
If the K.E of a particle is doubled its momentum will be:
A particle moves with under N. the power applied
All the food a person eat in 3 days has about same energy as:
Weight lifter of power 1960watt lifts load of mass M from the ground to a height of 2m in 3 seconds. M is
Which of the following bodies has the largest kinetic energy?
In the presence of air friction, the relation for free falling body is
The positive work done in the given diagram is:
A body moving with velocity v has momentum p and K.E numerically equal. The value of v is:
A light body A and heavy body B have equal momentum then KE of A:
Slope of work time graph is equal to
If a body of mass of 2 kg is raised vertically through 2m, then the work done will be
If velocity is doubled then
Electron, proton, deuterium and particle have same K.E. Which of them has highest momentum?
A bomb at rest explodes into two pieces of equal masses, two pieces will:
When the force retards the motion of body the work done is
Which of the following is nonconservative force?
The value of Power of 100 W bulb in erg/sec is
Force 10 N acts through a distance 20m. The force is then increased to 30 N and then acts through a further distance 40 m. Calculate the work done:
Two trailers, X with mass 500 kg and Y with mass 2000 kg, are being pulled at the same speed. The ratio of the kinetic energy of Y to that of X is:
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