constant = 2 and 4
variable = y
Explanation:
A constant is usually a symbol with a known value. In the expression, the constants are 2 and 4.
Their values are accurately known.
A variable is place holder and the value is not known. Variables are not static. They can take different numerical values as defined by an equation:
2cm +4y
the cm is the a unit
2 and 4 are constants
y is a variable that can assume any value
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Experiment brainly.com/question/1621519
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Density is mass over volume:

In your case, mass is 48 grams and volume is 12cm^3
If you put that into the equation, you will get your density:
Answer:
Part a)

Part b)
v = 3.64 m/s
Part c)

Part d)

Explanation:
As we know that moment of inertia of hollow sphere is given as

here we know that

R = 0.200 m
now we have


now we know that total Kinetic energy is given as





Part a)
Now initial rotational kinetic energy is given as



Part b)
speed of the sphere is given as
v = 3.64 m/s
Part c)
By energy conservation of the rolling sphere we can say




Part d)
Now we know that



