Answer:
360N
Explanation:
The frictional force = centripetal force = mass * centripetal acceleration = ma
Since centripetal acceleration = V^2/ r
Frictional force = mv^2 / r
Substitute the values of m = 80kg, radius = 2m and tangential speed = 3m/s
Frictional force = 80 * (3)^2/ 2 = 360N
You add salt to increase the boiling point so when its at that point by then all the salt has dissolved because it was warm water
Using
F= mv²/r
4 = 0.5×v² / 2
8 /0.5 = v²
v²=16
v= √16
v= 4 ms-¹
It all comes to the doppler effect, the red shift means that the galaxy is moving away from us. The redshift is a result from the doppler effect, so as the galaxy moves away the wavelength expands, increasing the wavelength which responds to the red light.
