Answer:
The answer is A)
Explanation:
An ionic compound is formed when one atom donates one or more electrons to one or more atoms of another element. Calcium has two valence electrons, which are donated to an atom of oxygen. So, an ionic compound is formed in the reaction involving one calcium atom with an oxygen atom.
The position of an oscillating mass is given by:

where A is the amplitude of the oscillation,
the angular frequency and t the time.
The velocity of the oscillating mass can be found by calculating the derivative of the position:

In this problem, A=2.0 cm and
, so if we substitute these data and t=0.4 s we can find the velocity at t=0.4 s:

Answer: 1.44. You can set centripetal force equal to gravitational force caused by the earth because the grav. force is what causes the satellite to orbit in a circle
Just know this:
x + y < or equal to z
Answer:
0.4455 m
Explanation:
g = Acceleration due to gravity = 9.81 m/s²
Total mass is

Here the spring constant is not given so let us assume it as 
Here, the forces are balanced

The springs are compressed by 0.4455 m