Answer:
w = 28.25 N
Explanation:
To do this, we need to use two expressions.
First, to calculate the weight of any object, we use the 2nd law of newton. In this case, the weight is:
w = m*g (1)
However we do not have the mass of the rod. We need to calculate that. To calculate the mass, we'll use the expression of density which is:
d = m/V
From here, we solve for mass:
m = d * V (2)
Finally, we can know the volume of the rod, because is cylindrical, therefore, the volume of a cylinder is:
V = π * r² * h (3)
So, in resume, we need to solve for the volume of the rod, then, the mass ans finally the weight. Let's calculate the volume of the rod, converting the units of centimeter to meters, just dividing by 100:
diameter = 2.3 cm ---> radius = 2.3/2 = 1.15 cm -----> 0.0115 m
Length or height = 88.8 cm ----> 0.888 m
Replacing in (3):
V = π * (0.0115)² * 0.888
V = 3.69x10⁻⁴ m
Now, let's use (2) to calculate the mass:
m = 7800 * 3.69x10⁻⁴
m = 2.88 kg
Finally for the weight, we'll use expression (1):
w = 2.88 * 9.81
<h2>
w = 28.25 N</h2><h2>
And this is the weight of the rod.</h2>
