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3 years ago

Explain how to measure volume using a graduated cylinder

Physics

1 answer:

Reil [10]3 years ago

6 0

Put object into cylinder and notice the volume increased. Difference of volume is the object's volume

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A compact disc (CD) stores music in a coded pattern of tiny pits 10−7m deep. The pits are arranged in a track that spirals outwa

andreev551 [17]

(a) 50 rad/s

The angular speed of the CD is related to the linear speed by:

$\omega=\frac{v}{r}$

where

$\omega$ is the angular speed

v is the linear speed

r is the distance from the centre of the CD

When scanning the innermost part of the track, we have

v = 1.25 m/s

r = 25.0 mm = 0.025 m

Therefore, the angular speed is

$\omega=\frac{1.25 m/s}{0.025 m}=50 rad/s$

(b) 21.6 rad/s

As in part a, the angular speed of the CD is given by

$\omega=\frac{v}{r}$

When scanning the outermost part of the track, we have

v = 1.25 m/s

r = 58.0 mm = 0.058 m

Therefore, the angular speed is

$\omega=\frac{1.25 m/s}{0.058 m}=21.6 rad/s$

(c) 5550 m

The maximum playing time of the CD is

$t =74.0 min \cdot 60 s/min = 4,440 s$

And we know that the linear speed of the track is

v = 1.25 m/s

If the track were stretched out in a straight line, then we would have a uniform motion, therefore the total length of the track would be:

$d=vt=(1.25 m/s)(4,440 s)=5,550 m$

(d) $-6.4\cdot 10^{-3} rad/s^2$

The angular acceleration of the CD is given by

$\alpha = \frac{\omega_f - \omega_i}{t}$

where

$\omega_f = 21.6 rad/s$ is the final angular speed (when the CD is scanned at the outermost part)

$\omega_i = 50.0 rad/s$ is the initial angular speed (when the CD is scanned at the innermost part)

$t=4440 s$ is the time elapsed

Substituting into the equation, we find

$\alpha=\frac{21.6 rad/s-50.0 rad/s}{4440 s}=-6.4\cdot 10^{-3} rad/s^2$

5 0

4 years ago

Read 2 more answers

The index of refraction for flint glass is 1.5. This means that

Alexxx [7]

Answer:

Explanation:

This means that the ratio of the speed of the incident beam of light in a vacuum to the speed of light in the glass is 1.5

7 0

3 years ago

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Where would you expect to find extrusive igneous rock?

Masja [62]

<span>The extrusive igneous rock is usually found along the ocean floor. These rocks are formed by the cooling off of semi molten fluid of rocks and other solids called as magma which comes out a volcano when it erupts forming a hard surface on earth.</span>

3 0

4 years ago

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A temperature-stable resistor is made by connecting a resistor made of silicon in series with one made of iron. If the required

baherus [9]

Answer:

The resistance of the silicon has to be 80 Ω and the iron must be 1120 Ω

Explanation:

Lets take

Temperature coefficients of resistivities or iron = $5.\times 10^{-3} K^{-1}$

Temperature coefficients of resistivities or silicon = $75.\times 10^{-3} K^{-1}$

The resistance of the iron increases a little as the temperature rises

The resistance of the silicon decreases a lot as the temp rises.

So we want the iron to be most of the resistance and have its increase in resistance exactly equal to the drop in resistance of the silicon.

Since the drop in the silicon is 15 times the rise in the iron ( 75 / 5 ) you want the iron to have 15 time the resistance of the silicon. And the total resistance has to be 1200Ω

1200/15 = 80

The resistance of the silicon has to be 80 Ω and the iron must be 1120 Ω

8 0

4 years ago

HELP ASAP!!! What was Johann Dobereiner’s contribution to the development of the periodic table?

Nataly_w [17]

He identified triads of elements that had similar properties

8 0

4 years ago

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