Answer: 0.83333333333 km/h
Explanation: give brainliest
Nichrome is usually used as the rod to heat water using electricity. It is an example of Nickel and belongs to the element Nickel in the periodic table.
Media 1 and 2 are air and liquid. By Snell's law;
n1/n2 = Sin ∅2/Sin ∅1
Then,
n2 = (n1* Sin Ф1)/Sin ∅2 = (1*Sin 31.7)/Sin 21.3 = 1.4466.
When the light travels in the opposite direction and at critical angle, media 1 and 2 are liquid and air respectively while ∅2 = 90°
Therefore,
n1/n2 = Sin 90 / Sin ∅c => ∅c = Sin ^-1[n2*Sin 90]/n1 = Sin ^-1[1*Sin 90]/1.4466 = 43.73°
The critical angle (∅c) is 43.73°.
The poles don’t receive direct sunlight which is why they are colder than the tropics. Even during the summer the sun is low on the horizon.
A falling object will reach 49 m/s
