Answer:
3.76188 kg
36.9040428 N
Yes
Explanation:
g = Acceleration due to gravity = 9.81 m/s²
L = Length of rod = 81.2 cm
d = Diameter of rod = 2.75 cm
r = Radius = 
A = Area of the cylinder = 
v = Volume = 
m = Mass
Density

The mass of the rod is 3.76188 kg.
As the the mass of the rod is 3.76188 kg I will be able to carry the rod.
Weight

The weight of the rod is 36.9040428 N
Exothermic because the heat make part of the result
C, planets orbit around the sun because of gravity
We Know: MA = d₁ / d₂
Here, d₁ = 4
d₂ = 10-4 = 6
Substitute their values into the expression:
MA = 4/6
MA = 2/3
So, Your Answer would be 2/3
Hope this helps!