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Let the force of gravity to be constant for small distances above the surface of the earth. A body is dropped from rest at a height h above the earth surface. What will be its kinetic energy just before it strikes the ground?
A single phase load draws 60 amps at a power factor of 0.9 lagging from a 230 v 50 hertz supply.
calculate
-apparent power
-true power
phase angle
the reactive power
The mean speed of the molecules of an ideal gas is 2.0 x 10^3 m/s.
The radius of a gas molecule is 1.5 x 10^ -10 m
Calculate the (i) collision frequency, and
(ii) mean free path. It is given that n= 4 x 10^24 per m^3
If I’m suspending an object in the air, then later I drop it and it lands in a bowl of flour (causing an ineslastic collision) what transformations of energy occur between kinetic and potential energy (omit sound, thermal, heat etc) at these points?:
1) when the object is suspended in the air
2) While the object is falling
3) When the object lands in the flour
At what specific points are both forms of energy present?
What is energy for H atom.
If I have an object suspended in the air by my hand, and I then drop it into a bowl of flour (causing an i elastic collision) What are the energies (kinetic, potential etc) at these points?
1) When it’s suspended in the air
2) as it’s falling from it’s initial height
3) when it lands in the flour.
at what specific points are both forms of energy present?
Four point masses of mass each of 1 kg are connected by a string which forms a square of diagonal 0.707 m . If square is placed on rotating table rotating with 5 rotation per second then what is the tension in string ?
A rollercoaster is designed to have a car full of riders (total mass = 610 kg) travel along a section of horizontal track at ground level with a speed of 25 m/s and then travel up a ramp, stopping at a height of 22 m.
Calculate the rollercoaster car’s:
(i) Input energy.
(ii) Useful output energy.
(iii) Percent efficiency.
If the rollercoaster was 100% efficient and all of the input energy was entirely transformed into useful output energy, what should have been the maximum height of the car?
A football player pushes a football sled with an applied a horizontal force of 103 N for a distance of 15 m. If this exercise took 25 s to complete, calculate the power produced by the football player.
Four persons A,B,C,D travel along a square of side d such that each one face the other after how much time they meet ?
