Legend says that archimedes, in determining whether or not the king’s crown was made of pure gold, measured its volume by the wa
1 answer:
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Answer:
Explanation:
The elastic potential energy of a spring is given by , where
is the spring constant of the spring and
is displacement from point of equilibrium.
When released, this potential energy will be converted into kinetic energy. Kinetic energy is given by , where
is the mass of the object and
is the object's velocity.
Thus, we have:
Substituting given values, we get:
Here we know that
now from kinematics we have
now from above all values we have
so final angular speed is -12.6 rad/s
Answer: The correct option is Option b.
Explanation:
Power is defined as the rate of work done by an object.
Mathematically,
.....(1)
And work done is the product of force exerted on the object times the displacement covered by that object.
Mathematically,
Putting this value in above equation, we get:
where,
P = power = ?W
F = Force exerted = 10N
s = Displacement = 400cm = 4m (Conversion factor: 1m = 100 cm)
t = Time taken = 8s
Putting values in above equation, we get
Hence, the correct option is Option b.