Using the solar constant, estimate the rate at which the whole earth receives energy from the sun. (hint: think about the area of the earth as seen from the sun)

1.475×10²⁴ W

Explanation:

I = Solar constant of the sun = 1362 W/m² (measured using satellites with value 1.3608 ± 0.0005 kW/m² the error is due to fact that solar output is not always constant)

r = Radius of earth = 6371 km = 6371000 m (mean radius)

A = Area of earth = (4/3)×π×r³

=(4/3)×π×6371000³ = 1.083×10²¹ m²

P = I×A

⇒P = 1362×1.083×10²¹

⇒P = 1.475×10²⁴ W

∴ Rate at which the whole Earth receives energy from the Sun is 1.475×10²⁴ W

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

f=ma newton

f=100x2.5=250n