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Arturiano [62]
3 years ago
6

If you were to mix 3 liters of 20 degrees celsius water with 4 liters of 30 degrees water at 7 liters of water what temperature

Physics
1 answer:
Debora [2.8K]3 years ago
3 0
Lets say final temperature is @ celsius
3c(@-20)= 4c([email protected])
[email protected]=180
@=180/7
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A pendulum of mass 5.0 kg hangs in equilibrium. A frustrated student walks up to it and kicks the bob with a horizontal force of
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Answer:

The length is L = 6.206m and the angle is \theta = 37.752^o.

Explanation:

The period T of the pendulum is related to its length L by

T = 2\pi \sqrt{\dfrac{L}{g} },

where g =9.8m/s^2 is the acceleration due to gravity.

Solving for L we get

L = \dfrac{T^2g}{4\pi^2}

putting in T =5.0s and g =9.8m/s^2 we get:

L = \dfrac{(5.0s)^2*9.8m/s^2}{4\pi^2}

\boxed{L = 6.206m.}

There are two forces acting on the pendulum: The gravitational force mg and the F = 30N student's force. Therefore, the angular displacement \theta that these forces give is

sin(\theta ) = \dfrac{F}{mg}

\theta = sin^{-1}( \dfrac{F}{mg})

putting in F =30N, m =5.0kg, and g =9.8m/s^2 we get

\theta = sin^{-1}( \dfrac{30N}{5.0kg*9.8m/s^2})

\boxed{\theta = 37.752^o.}

4 0
3 years ago
A force of 200N is being applied over an area measuring 0.75m^2
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Answer:

357KG

Explanation:

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A horizontal platform in the shape of a circular disk rotates on a frictionless bearing about a vertical axle through the center
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Answer:

10.93 rad/s

Explanation:

If we treat the student as a point mass, her moment of inertia at the rim is

I_r = mr^2 = 67.8*3.7^2 = 928.182 kgm^2

So the system moment of inertia when she's at the rim is:

I_1 = I_d + I_r = 274 + 928.182 = 1202.182 kgm^2

Similarly, we can calculate the system moment of inertia when she's at 0.456 m from the center

I_2 = I_d + 67.8*0.456^2 = 274 + 14.1 = 288.1 kgm^2

We can apply the law of angular momentum conservation to calculate the post angular speed when she's 0.456m from the center:

I_1\omega_1 = I_2\omega_2

\omega_2 = \omega_1\frac{I_1}{I_2} = 2.62*\frac{1202.182}{288.1} = 10.93 rad/s

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3 years ago
It usually takes more force to start an object sliding than it does to keep an object sliding because static friction is usually
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The answer is already in the blank for, its was greater
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spectroscope or a spectrometer is an instrument which is used for separating the components of light, which have different wavel
ohaa [14]

Answer:

The answer is B

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