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noname [10]
3 years ago
5

The coefficient of linear expansion of lead is 29 x 10 K What change in temperature will cause a 5-m long lead bar to change in

length by 3.0 mm?
Physics
1 answer:
zalisa [80]3 years ago
5 0

Answer:

These linear thermal expansion coefficients are room temperature values of metals. Linear thermal expansion coefficient is defined as material's fractional change in length divided by the change in temperature.

Explanation:

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How much current will be flowing through a 40.0 m length of cylindrical metal wire with radius 4.0 mm if it is connected to a so
Degger [83]

Answer:

Current, I = 1200 A                                    

Explanation:

It is given that,

Length of the cylinder, l = 40 m

Radius of the metal wire, r = 4 mm = 0.004 m

Voltage source, V = 16 V

Resistivity of metal, \rho=1.68\times 10^{-8}\ \Omega-m    

We know that the resistivity of any metal is given by the formula as :

R=\rho \dfrac{l}{A}

R=1.68\times 10^{-8}\times \dfrac{40}{\pi (0.004)^2}

R = 0.01336 ohms

Using ohm's law :

R=\dfrac{V}{I}

I=\dfrac{V}{R}

I=\dfrac{16}{0.01336}

I = 1197.60 A

or

I = 1200 A

So, the current flowing in the cylindrical wire is 1200 A. Hence, this is the required solution.

6 0
4 years ago
A thin uniform cylindrical turntable of radius 2.2 m and mass 35 kg rotates in a horizontal plane with an initial angular speed
fenix001 [56]

Explanation:

The given data is as follows.

    M = 35 kg,    radius (r) = 2.2 m,

     m = 17 kg,     = 11 rad/s

We assume that will be the final angular speed.

Now, according to the conservation of angular momentum.

         L_{1} = L_{2}

or,    I_{1} \times \omega_{1} = I_{2} \times \omega_{2}

Putting the given values into the above formula as follows.

  I_{1} \times \omega_{1} = I_{2} \times \omega_{2}

   

or,  

      = \frac{(0.5 \times 35 \times (2.2)^{2}) \times 11}{(0.5 \times 35 \times (2.2)^{2} + 17 \times (1.5)^{2})}

      = 7.58 rad/s

Thus, we can conclude that the angular speed of the clay and turntable is 7.58 rad/s.

4 0
4 years ago
Read 2 more answers
The tortoise and the hare are having a race over a course of length 0.52 km. The tortoise crawls along at a constant 0.075 m/s w
EastWind [94]

Answer:the hare slept for 1 hr 55minutes.

Explanation: distance is changed to meters = 520m

Speed=distance/time

Speed of tortoise is 0.075m/s=520m/t

Crops multiplying t= 520/0.075 = 6933.3 seconds.

Speed for hare 16.7m/s =260m/t

ie 260m is half of the distance.

t =15.56seconds

Therefore the time slept by the hare = 6933.3- 15.56= 6917.74 seconds.

Converting to hours = 1hr. 55minutes is the time the hare slept.

3 0
3 years ago
Fossil fuels are burned, transferring their chemical potential energy to heat energy. How are nuclear power stations different?
labwork [276]

Answer:

fossil fuels are natural and limited, nuclear is man made and more toxic

Explanation:

6 0
3 years ago
A 15-meter length of aluminum wire is at 20 degrees C. The radius of the wire is 4.2 x 10-4 meters. What’s the resistance of the
bezimeni [28]

Answer:

Idek figure it out

Explanation:

Why u so lazy?

5 0
3 years ago
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