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4 years ago

11

i will give brainliest Which of the following structures are present in plant cells but absent in animal cells? Choose 1 answer:

(Choice A) A Cell walls (Choice B) B Mitochondria (Choice C) C Cytosol (Choice D) D Golgi bodies

1 answer:

Sonja [21]4 years ago

3 0

Answer:

A. cell walls

Explanation:

Plants have cell walls but animals dont.

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Factors affecting speed of sound in air

zhannawk [14.2K]

Answer:

The Density of Medium: Sound requires a medium to travel. The density of the medium is among the factors which affect the speed of sound. ...

The Temperature of The Medium: Higher the temperature, the higher is the speed of sound in the medium.

Explanation:

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3 years ago

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Q17: The coefficient of linear expansion of steel is a = 11 x 10-6 / °C. A steel

krek1111 [17]

Solution:

The coefficient of volume expansion

p = ΔV/V1Δt

3a = V2-V1/V1Δt

Given

a = = 11 x 10-6 / °C

V2 is the final volume

V1 is the initial volume = 100cm³

Δt = 100-0 = 100°C

Substitute

3(11 x 10-6) = V2-100/100(100)

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33*10^-2 = V2-100

V2 = 100 + 0.33

V2 = 100.33

Hence the new volume is 100.33cm³

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3 years ago

Explain the difference between contact and non-contact forces. Give an example of each

Amiraneli [1.4K]

pushing on something that pushes back = action and reaction.

Gravity is non contact. Action at a distance. Hence stones wil fall if dropped.

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3 years ago

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now suppose that we have attached not just two springs in series, but N springs. Write an equation that expresses the effective

sammy [17]

Answer:

$k_{eq} = \frac{k}{N}$

Explanation:

For this exercise let's use hooke's law

F = - k x

where x is the displacement from the equilibrium position.

x = $- \frac{F}{k}$

if we have several springs in series, the total displacement is the sum of the displacement for each spring, F the external force applied to the springs

x_ {total} = ∑ x_i

we substitute

x_ {total} = ∑ -F / ki

F / k_ {eq} = -F $\sum \frac{1}{k_i}$

$\frac{1}{k_{eq}} = \frac{1}{k_i}$ 1 / k_ {eq} = ∑ 1 / k_i

if all the springs are the same

k_i = k

$\frac{1}{k_{eq}} = \frac{1}{k} \sum 1 \\$

$\frac{1}{k_{eq} } = \frac{N}{k}$

$k_{eq} = \frac{k}{N}$

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3 years ago

Is the tropic of cancer north or south of the equator?

Daniel [21]

It’s North of the equator

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3 years ago

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