Physics, 13.07.2020 23:01 ayalat9596

How does heat reach to us from the sun

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The Sun releases huge amounts of energy through thermonuclear reactions in its core, where hydrogen is converted to helium. The energy created is in the form of electromagnetic radiation, effectively waves of electrical charge and magnetic force. This energy works its way to the surface of the Sun, heating the plasma (ionised gas - mostly hydrogen) that makes up the Sun. The Sun's surface, at 6,000 degrees, is much much cooler than the millions of degrees at the core.

From there, the radiation streams out into space at the speed of light, nearly 300,000 km per second. After about 8 minutes, some of it will intercept Earth. The Oceans and land surface will absorb some of the radiation and reflect some of it back into space. Radiation absorbed will heat the surface rocks, soil, ice and water. The land and seas in turn heat up the atmosphere through direct contact (conduction) and the heat is spread throughout the atmosphere through convection (air currents set in motion because warm air is lighter and will rise).

As the Earth's surface warms up, it radiates heat, mostly in the infrared part of the spectrum. When heat radiated equals incoming solar radiation, it stops heating up. When the sun sets, the Earth keeps on radiating and cooling until the next sunrise.

Answer from: Quest

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm. the wire diameter is d = 0.9 mm. the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2) in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

Answer from: Quest

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2) in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

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