m = mass of the roller coaster = 500 kg
h = height of the hill = 80 m
v = speed of the roller coaster at the bottom of the hill = ?
using conservation of energy
kinetic energy at the bottom of the hill = potential energy at the top of hill
(0.5) m v² = m g h
(0.5) v² = g h
inserting the values
(0.5) v² = (9.8) (80)
v = 39.6 m/s
hence the speed at the bottom comes out to be 39.6 m/s
Earthquakes does not belong because it is not an electromagnetic wave.
Well the definition is for every action theres is an equal and opposite reaction.
Answer:
Explanation:
It is given that initially sphere has different charges and momentarily brought in contact with each other.
When the spheres are touched then charge is equally redistributed among spheres such that now they possess the equal amount of charges.
When they are suspended from the thread their separation increases compared to previous situation because now the value of force increases because of the change in the product of charges.
For example, Suppose initially they possess 15 C and 17 C charge and after redistribution they both possess 16 C of charge.
Product of charges
Final Product of charges
As force depends upon the Product of the charges so there will be more repulsive force.