Physics Answers

Obtain expression for escape velocity?

Is it possible to provide any kind of motion to a significant size of box if applied force is less then friction between surface and box

A small block of mass m slides down a rough plane inclined at an angle of 45° to the horizontal.

If the block starts from rest, and has velocity v after travelling a distance x down the plane, find

an exact expression for the work done against friction, in terms of m, g, x and v.

1.A shopper pushes her 25 kg grocery cart by a force of 225 N inclined at an angle of 60° with the horizontal through a distance of 7.5 m. Find the work done by the force applied by the shopper.

2.Horizontal force F applied to an object varies with its displacement. Calculate the work done by the force when the object moves from x=0 to x=10.0 m

A car of mass 2500 kg is driving up a hill inclined at an angle of 10° to the horizontal. If the

resistance to motion is 3.5 kN, and the speed is a constant 20 m/s, find the power exerted.

How to find the equation of trajectory using conservation of energy theorem

What if we define a 'RANDOM' mathematical set F in the beginning of universe whose cardinality remains constant with all parameters. the set represents five fundamental forces in universe,which remains same even if we discover a new force as we can directly right mathematical expressions of that new force in terms of any of those five fundamental force and there are only two long range forces in the set and other three are short range forces.Gravitational which is only attractive and Electromagnetic which is both attractive and repulsive so let's say we defined their mathematical expressions we found out the constants associated with them.We developed the concept of light from their.Then we used Hubble telescope to see the start of universe and we saw the different places in universe accelerating at different rate and we gave the argument that force due to dark energy is responsible for it but actually if we see in our set there is no such force so definitely if it is repulsive in nature there is only one such force which is repulsive.One at short range which is roughly the strength of gravitational force and acting between electrons and neutrons and other is a long range force which is nothing but the electromagnetic force.Through Hubble telescope we saw that repulsive force acts at long range so it implies that force has to be electromagnetic force.So from the thought experiment that I created is it proven that there is no dark energy and it is basically electromagnetic force and accept it or not when we talk about charge on a planet that is impossible to find out as we can never go to every galaxy or planet.So have I solved the biggest mystery of the universe through this thought experiment

CONSIDER A CIRCUIT HAVING 30 VOLT SOURCE , SWITCH , RESISTANCE R , CAPACITOR 0.01 MICRO FARAD AND RESISTANCE 10 KILO OHM CONNECTED IN SERIES WHEN THE SWITCH IN THIS CIRCUIT IS CLOSED , THE VOLTAGE ACROSS THE CAPACITOR MUST RISE TO 6.59 VOLT IN 0.1 MS IDENTIFY THE VALUE OF R THAT SHOULD BE USED

If the stone enters the water at 41.6 ms^-1, and takes 0.6s to travel the 3 meters to the bottom of the pond, what is its average acceleration in the pond water? 

What is langrangian.