<u>We are given</u>
- Radius of Earth; 6.4 x 100 meters = 640 meters
Clearly, the shape of the earth is a sphere. Thus, to determine the volume of the earth, we will use a formula that determines the volume of a sphere.

When we substitute the radius in the formula, we get;


Take π as 3.14


Simplify the numerator;


Divide the numerator by 3;


The cost of 1kg of coal mined from the ore is $0.0397
Data;
<h3>The Cost of 1kg of Coal</h3>
To find the cost of 1kg of coal, we can simply and equate 1 ton to its equivalent in ton and the solve.

let's write this and equate it
1 ton = $35.99
907kg = $35.99
1kg = x
Let's cross multiply both sides and solve for x

The cost of 1kg of coal is $0.0397
Learn more on proportions here;
brainly.com/question/870035
Answer:65739
Step-by-step explanation: because it has to be 65739 because it is the best possible answer
<u>Answer-</u>

<u>Solution-</u>
The equation for time period of a simple pendulum is given by,

Where,
T = Time period,
L = Length of the rod,
g = Acceleration due to gravity.
Frequency (f) of the pendulum is the reciprocal of its period, i.e

Putting the values,




Answer:
?
Step-by-step explanation: