Answer: Coral reef structures also buffer shorelines against 97 percent of the energy from waves, storms, and floods, helping to prevent loss of life, property damage, and erosion. When reefs are damaged or destroyed, the absence of this natural barrier can increase the damage to coastal communities from normal wave action and violent storms.
Answer:
what are the choices provided?
Explanation:
Answer:
Explanation:
mass of each ball, m = 1 kg
Let the charge on each ball is q.
If the balls remains fix then the gravitational force is balanced by the electrostatic force between them and as the gravitational force is attractive in nature then the electrostatic force should be repulsive in nature.
The charges should be of same sign to get the electrostatic force is repulsive in nature.
Let the distance between the two balls is d.
The electrostatic force between them is given by
... (1)
The gravitational force between the two balls is given by
... (2)
according to the question, gravitational force is equal to the electrostatic force, so by equation (1) and (2) ,we get
Thus, the charge on each ball is
To solve this problem we will apply the concept related to the electric field. The magnitude of each electric force with which a pair of determined charges at rest interacts has a relationship directly proportional to the product of the magnitude of both, but inversely proportional to the square of the segment that exists between them. Mathematically can be expressed as,
Here,
k = Coulomb's constant
V = Voltage
r = Distance
Replacing we have
Therefore the magnitude of the electric field is
Answer:
a) 8.85 kJ
b) 7.85 kJ
c) 6.85 kJ
Explanation:
we will use the energy conservation theorem for all of the stages
for stage 1:
the initial velocity and the potential gravitational energy at the bottom is zero:
for stage 2:
the velocity is constant so there is no change in the kinetic energy, so there is change only on the potential gravitational energy:
for stage 3:
there is a change for both, gravitational and kinetic energy so: