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Readme [11.4K]
3 years ago
11

An IGCSE student thinks it may be possible to identify different rocks (A, B and C) by measuring their

Physics
1 answer:
kherson [118]3 years ago
8 0

Answer:

See the answer below

Explanation:

a. The volume in the first measuring cylinder reads 70 cm^3 while that of the second reads 95  cm^3. Hence;

V1 = 70  cm^3

V2 = 95  cm^3

b. <u>An object will always displace its own volume in a liquid</u>. Hence:

Volume V of the rock sample = V2 - V1

   = 95 - 70 = 25  cm^3

c. Mass of A = 102 g

   Volume of A = 25  cm^3

<em>Density = mass/volume</em>

Hence, density of A = 102/25 = 4.08 g/cm^3

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Answer:

Slightly above 20°c

Explanation:

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The resistivity of tungsten at 20°c is 5.6x10-8Ωm

We see the value is just an approximation of 4 times not exactly.

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In the visible spectra of stars, absorption lines of hydrogen are produced when atoms are excited from n = 2 to higher levels (t
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calculate the displacement of a mouse walking along a ruler, if it begins at the location x=5cm, and then walks yo x=12cm
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Would the frequency of the angular simple harmonic motion (SHM) of the balance wheel increase or decrease if the dimensions of t
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Answer:

Yes the frequency of the angular simple harmonic motion (SHM) of the balance wheel increases three times if the dimensions of the balance wheel reduced to one-third of original dimensions.

Explanation:

Considering the complete question attached in figure below.

Time period for balance wheel is:

T=2\pi\sqrt{\frac{I}{K}}

I=mR^{2}

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R = radius of balance wheel.

Angular frequency is related to Time period as:

\omega=\frac{2\pi}{T}\\\omega=\sqrt{\frac{K}{I}} \\\omega=\sqrt{\frac{K}{mR^{2}}

As dimensions of new balance wheel are one-third of their original values

R_{new}=\frac{R}{3}

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What does velocity tell about movement
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