Answer:
Explanation:
Given
Charge Q is uniformly spread over large non-conducting Elastic sheet
Electric field due to non-conducting Elastic sheet
where surface charge density
for side 2d Electric Field is given by
Some of the energy the car gained as it was pulled was lost because of heat from friction. The rest of the energy was transforme
d into potential energy. How much potential energy does the roller coaster car have at the top of the first hill? Use PE = m × g × h, and assume that g = 9.8 m/sec2.
2 answers:
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Answer:
The speed of the wind is 25 km/hr.
Explanation:
Let us call the speed of the plane and
the speed of the wind. When the plane is flying against the wind, it covers the distance of 900-km in 2 hours (120 minutes); therefore;
(1).
And when the plane is flying with the wind, it covers the same distance in 1 hour 48 minutes (108 minutes)
(2).
From equation (1) we solve for and get:
,
and by putting this into equation (2) we get:
or in km/hr this is