Answer:
L/2
Explanation:
Neglect any air or other resistant, for the ball can wrap its string around the bar, it must rotate a full circle around the bar. This means the ball should be able to swing to the top position where it's directly above the bar. By the law of energy conservation, this happens when the ball is at the same level as where it's previously released vertically. It means the swinging radius around the bar must be at least half of the string length.
So the distance d between the bar and the pivot should be at least L/2
The parallel conducting plates
The first one will be 220N
The force of gravity on a certain object is calculated through the equation,
F = Gm1m2 / r²
where F is the force, G is a constant, m1 and m2 are masses of the object and Earth, respectively and r is the distance. Substituting the known values for this item,
F = (6.67 x 10⁻¹¹ N.m²/kg²)(1 kg)(5.98 x 10²⁴ kg)/ (6.4 x 10⁶ m)²
F = 9.37 N
Answer: 9.37 N
Answer: The water in the pool is acidic
Explanation:
The pH level indicates the concentration of hydrogen ions in a solution and is setted in a scale from 0 (which is acid) to 14 (which is alkaline), being 7 the neutral value.
In this context, the normal pH level in a pool's water must be between 7.2 and 7.6
. So, since this pool's water pH is 6.5 we can say the water is acidic.
It is important to note that this may lead to skin and eyes irritation of the bathers, instability of chlorinated products and corrosion in the metal parts of the pool that are in contact with this water.