Material that slows down or resists the flow of current. these are used in electric circuits to help control the flow of current
1 answer:
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Answer:
Minimum speed will be equal to 2.213 m/sec
Explanation:
We have given radius of the r = 2 m
Coefficient of friction
At minimum speed frictional force will be equal to centripetal force
So
So the minimum speed will be equal to 2.213 m/sec
The efficiency of a machine is the ratio between the output power and the power in input:
in our problem, the output power is 3760 W while the input power is 4000 W, so the efficiency is
So the efficiency of the machine is 94%.
in our problem, the output power is 3760 W while the input power is 4000 W, so the efficiency is
So the efficiency of the machine is 94%.
Answer:
the height reached is = 0.458 [m]
Explanation:
We need to make a sketch of the ball and see the location of the reference point where the potential energy is zero. But the kinetic energy will be defined by the following expression:
Replacing the values on the equation we have:
This kinetic energy will be transformed in potential energy in the moment when the ball starts to rolling up. Therefore the maximum height reached by the ball depends of the initial velocity given to the ball.
Now we have:
In that moment when the ball reach the 0.45 [m] the potencial energy will be maximum and equal to the kinetic energy when the ball has a velocity of 3[m/s]
