Can you use a heat pump to provide the temperature difference to run a heat engine?
Yes, a heat engine runs on heat.
Yes, a heat pump moves heat.
No, heat is not created.
No, the heat supplied does not create a large enough temperature difference.

No,we cannot use  heat pump to provide the temperature difference to run a heat engine.

Explanation:

In a heat pump energy is transferred from the heat source to the heat sink whereas in the heat engine energy is transferred from a higher temperature level to a lower  temperature level called sink.In a heat engine the heat energy is converted into mechanical energy

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

the components of a vector are the parts of the vectors that are to each other.

b perpendicular