Calcium ions have a +2 charge and sulfur ions have a -2 charge, so the formula is CaS
You will need rocks brick and water.
I think the correct answer from the choices listed above is the second option. In Niels Bohr’s model of the atom, electrons move like planets orbiting the sun. His model of atom is seen as<span> very small, positively charged nucleus which contains proton and neutron surrounded by negatively charged electrons.</span><span> These electrons travel in circular orbits around the nucleolus. </span>
Answer:
Acceleration of the platform = - 1.8 m/s²
Explanation:
The net force acting on a body accelerates the body in the same direction as that in which the resultant is applied.
Writing the force balance for the setup,
ma = 800 - mg
100a = 800 - 100×9.8
100a = - 180
100a = - 180
a = - 1.8 m/s²
This means the body falls downwards.