Answer:
It is worth noting that the higher the gravitational energy of an object moving downwards, the lower the kinetic energy, and the lower the kinetic energy of an object moving upwards, the higher its gravitational energy.
Gravitational potential energy is acquired by an object when it has been moved against a gravitational field. For example, an object raised above the surface of the Earth will gain energy, which is released if the object is allowed to fall back to the ground.
Answer:
A battery is a device that stores chemical energy and converts it to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit. The flow of electrons provides an electric current that can be used to do work.
(a) 
The energy of a photon is given by:

where
is the Planck constant
is the speed of light
is the wavelength
For the microwave photon,

So the energy is

And converting into electronvolts,

(b) 
For the energy of the photon, we can use the same formula:

For the visible light photon,

So the energy is

And converting into electronvolts,

(c) 
For the energy of the photon, we can use the same formula:

For the x-ray photon,

So the energy is

And converting into electronvolts,

Answer:
-0.4 m/s
-3.552 m/s
Explanation:
= Mass of first glider = 0.5 kg
= Mass of second glider = 0.3 kg
= Initial Velocity of first glider = 2 m/s
= Initial Velocity of second glider = -2 m/s
= Final Velocity of first glider
= Final Velocity of second glider = 2 m/s
As the linear momentum of the system is conserved we have

The velocity of glider A is -0.4 m/s
= 0
= -5 m/s
= 0.92 m/s

The velocity of glider A is -3.552 m/s
C.labratory
I hope this helps