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Ulleksa [173]
3 years ago
8

a ball is thrown vertically upward with an initial speed of 40 m/s. how high is the ball above the ground when it stops

Physics
2 answers:
NISA [10]3 years ago
5 0

Answer:

80m, assuming g=10m/s^2

Explanation:

40m/s will be reduced to 0m/s in 4 seconds. 4 seconds x 40m/s would be 160m up, but you will only get half of that because you decelerate linearly to 0m/s. This leaves you with 4 x 20 = 80m.

jok3333 [9.3K]3 years ago
3 0

Answer:

80m

Explanation:

According to the equation of motion, v²= u²+2as

Where v is the final velocity of the body at maximum height= 0m/s

u is the initial velocity of the body = 40m/s

a = -g (negative acceleration due to gravity since the object is thrown upward) = -10m/s²

S = H = the height of the ball above the ground

Substituting the values into the equation given, we will have;

0² = 40²-2(10)H

0 = 1600-20H

-1600 = -20H

H = -1600/-20

H = 80m

The height of the ball above the ground where it stops will be 80m

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Answer:

Resistivity = 231.481 K Ohm

Yes, Intrinsic Silicon is the semiconductor.

Explanation:

Solution:

At 300K:

Let suppose mobility of electron in intrinsic semiconductor = M_{e}

Mobility of electron in intrinsic semiconductor is:

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Let suppose mobility of hole in intrinsic semiconductor = M_{h}

M_{h} = 500 cm^{2}/volt.sec

We know that, intrinsic silicon semiconductor has equal number of holes and electrons. So,

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Intrinsic Carrier Concentration = 1.5 x 10^{10}/cm^{3} = C

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Conductivity of intrinsic Silicon is:

σ = C x (M_{h} + M_{e}) e

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So, plugging in the values, we get:

σ = C x (M_{h} + M_{e}) e

σ = 1.5 x 10^{10} x (500 + 1300) x 1.6 x 10^{-19}

σ = 4.32 x 10^{-6}

So, now we can find the resistivity.

Resistivity = 1/σ

Resistivity = 1/ 4.32 x 10^{-6}

Resistivity = 231.481 K Ohm

Yes, Intrinsic Silicon is the semiconductor.

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