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OLga [1]
4 years ago
7

Material that slows down or resists the flow of current. these are used in electric circuits to help control the flow of current

Physics
1 answer:
Nataly_w [17]4 years ago
3 0
It's called an insulator

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Which force causes acceleration(gravity)(friction)(velocity )(energy)
icang [17]

Velocity causes acceleration

Please vote brainliest!

8 0
4 years ago
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In a carnival ride, passengers stand with their backs against the wall of a cylinder. The cylinder is set into rotation and the
Lerok [7]

Answer:

Minimum speed will  be equal to 2.213 m/sec

Explanation:

We have given radius of the r = 2 m

Coefficient of friction \mu =0.25

At minimum speed frictional force will be equal to centripetal force

So \mu mg=\frac{mv^2}{r}

\frac{v^2}{r}=\mu g

v=\sqrt{\mu rg}=\sqrt{0.25\times 2\times 9.8}=2.213m/sec

So the minimum speed will be equal to 2.213 m/sec

8 0
3 years ago
A machine is supplied Energy at a rate of 4000 W and does useful work at a rate of 3760 W. What is the efficiency of the machine
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The efficiency of a machine is the ratio between the output power and the power in input:
\epsilon =  \frac{P_{out}}{P_{in}}
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\epsilon =  \frac{3760 W}{4000 W} =0.94
So the efficiency of the machine is 94%.
6 0
3 years ago
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A 2 kg ball is moving 3 m/s when it starts rolling up a hill.
AURORKA [14]

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:

Ek=\frac{1}{2} *m*v^{2} \\where:Ek= kinetic energy [J]\\m = mass of the ball [kg]\\v = velocity of the ball [m/s]

Replacing the values on the equation we have:

Ek=\frac{1}{2}*(2)*(3^{2} )\\ Ek=9[J]\\

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.

Ek=Ep\\where\\Ep=potential energy [J]\\Ep=m*g*h\\where\\g=gravity = 9.81[m/s^2]\\h=height reached [m]\\

Now we have:

h=\frac{Ep}{m*g} \\h=\frac{9}{2*9.81} \\\\h=0.45 [m]

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]

6 0
3 years ago
Please solve this problem inelastic collision
S_A_V [24]

It will crash at a speed of 5 m/s and that's basically it.

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4 years ago
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