Answer:
(negative charge)
Explanation:
Hi!
To solve this problem we use Gauss Law for electric fields, which relates the flux of electric field E through a closed surface S with the charge Q enclosed by that surface:
In this problem S is a cube of side length 2cm. The integral is easy because the electric field is uniform in each face, and normal to the face. The total integral is the sum of the integrals in each of the six faces.
Answer:
Hydrogen (H)
Explanation:
If you look at the periodic table, the elements are numbered. H is number 1 which stands for Hydrogen.
An airplane wing is designed to make the air move <em>faster over the top than under the bottom. (c)</em> They do this by making the top of the wing curved and the bottom flat, so the air that flows over the top has farther to go.
It turns out, according to a scientist named Bernoulli, that air exerts lower pressure when it moves faster. So if it moves faster over the top of the wing, then there's less pressure on the top of the wing and more on the bottom, and the wing thinks there's a force that's LIFTING it . . . <em>very convenient and useful</em> if the wing is part of an airplane !
Answer:
a) 
, b) 
Explanation:
a) The maximum height is obtained with the help of the First and Second Derivative Tests:
First Derivative
Second Derivative
(absolute maximum)
The maximum height reached by the ball is:
b) The time required by the ball to hit the ground is:
Just one root offers a solution that is physically reasonable:
The velocity of the ball when it hits the ground is:
