Levers
Most machines in your body are levers that consist of bones and muscles. Tendons and muscles pull on bones, making them act as levers. Joint, near where tendon is attached to bone acts as fulcrum. Muscles produce input force.
Answer:
b is called the power of base 10.
Explanation:
In the scientific notation form

the exponent b is called the power of the base 10.
Answer:
-639288.89 N/C
Explanation:
x = 21-6 = 13.5 cm
= 6 cm
= 21 cm

k = Coulomb constant = 
The net electric field is given by

The net electric field is 
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