The motor of an electric drill has a power input of 1200 W. How much work 3 points
1 answer:
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As per the question the mass of the boy is 50 kg.
The boy sits on a chair.
We are asked to calculate the force exerted by the boy on the chair at sea level.
The force exerted by boy on the chair while sitting on it is nothing else except the force of gravity of earth i.e the weight of the body .The direction of that force is vertically downward.
At sea level the acceleration due to gravity g = 9.8 m/s^2
Hence the weight of the boy [m is the mass of the body]
we have m = 50 kg.
Hence w = 50 kg ×9.8 m/s^2
=490 N kg m/s^2
= 490 N
Here newton [N] is the unit of force.
Answer:
a
b
Explanation:
From the question we are told that
The maximum angular speed is
The time taken is
The minimum angular speed is this is because it started from rest
Apply the first equation of motion to solve for acceleration we have that
=>
substituting values
converting to
We have
According to the first equation of motion the angular displacement is mathematically represented as
substituting values
converting to revolutions