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2 years ago

Help!!!!!!!!!!!!!!!!!

Physics

2 answers:

Illusion [34]2 years ago

6 0

Answer:

(4) Elastomers

Explanation:

Substances which can be elastically stretched to large value of strain are called elastomers.

Fudgin [204]2 years ago

5 0

Answer:

<h3>Substances which can be easily stretched to large value of strain are called</h3><h2><em>Elastomers</em></h2>

<h3><em>Some</em><em> </em><em>of</em><em> </em><em>the</em><em> </em><em>Examples are the tissue of the aorta, rubber, etc.</em></h3>

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If a 10-volt battery is placed across a 2-ohm resistance (R = 20), a current of

attashe74 [19]

Answer: current I = 0.5 A

Explanation:

Given that the

Potential difference V = 10V

Resistance R = 20 ohms

According to ohms law

V = IR

Where

V = potential difference

I = current

R = resistance

Make I the subject of formula

I = V/R

I = 10/20

I = 0.5 Ampere

4 0

3 years ago

calculate the diameter of a silver wire of length 75cm , which is extended by 1.85mm when a 10kg mass is suspended from it's end

sdas [7]

Answer: $0.8\ mm$

Explanation:

Given

length of wire $l=75\ cm$

change in length $\Delta l=1.85\ mm$

mass of wire $m=10\ kg$

Young's modulus for silver $E=7.9\times 10^{10}\ N/m^2$

load on wire $F=mg$

$F=10\times 9.8=98\ kg$

change in length is given by

$\Delta l=\dfrac{Pl}{AE}$

Where A=area of cross-section

$A=\dfrac{Pl}{\Delta lE}$

$A=\dfrac{98\times 0.75}{1.85\times 10^{-3}\times 7.9\times 10^{10}}$

$A=\dfrac{73.5}{14.615\times 10^{7}}$

$A=5.029\times 10^{-7}\ m^2$

also wire is the shape of cylinder so cross-section is given by

$A=\dfrac{\pi d^2}{4}=5.029\times 10^{-7}\ m^2$

$\Rightarrow d^2=\dfrac{5.029\times 10^{-7}\times 4}{\pi }$

$\Rightarrow d^2=64.02\times 10^{-8}$

$\Rightarrow d=8\times 10^{-4}\ m$

$\Rightarrow d=0.8\ mm$

4 0

3 years ago

Which best describes the surface of a concave mirror? It is flat. It is textured. It curves outward. It curves inward.

Sonja [21]

The concave mirror is a spherical-shaped mirror that has an inner curved surface. Hence, option (4) is correct.

What is a concave mirror?

The concave mirrors are spherical-shaped mirrors that are painted on the outward surface. It is also known as the converging mirror, having the recessed inner reflecting surface.

The concave mirrors are generally used for the purpose to focus the light. For that, they might have a reflecting surface, curved inwards, and the reflection of light is limited to the single focal point.
The reflecting surface of the concave mirror has its vertex or midpoint lying farther away from the objects than the edges.

Thus, we can conclude that the surface of the concave mirror is curved inward. Hence, option (4) is correct.

Learn more about the concave mirror here:

brainly.com/question/13300307

8 0

2 years ago

L 1.3.5 Quiz: Using Models

arsen [322]

Answer:

0.12 is correct

Explanation:

1:25=1/25

1/25x3=

3/25=0.12:)

8 0

3 years ago

Which equations represent the relationship between wavelength and frequency for a sounds wave

ioda

Waves can be described using a number of different characteristics of a wave. Wavelength and frequency are two such characteristics. The relationship between wavelength and frequency is that the frequency of a wave multiplied by its wavelength gives the speed of the wave

6 0

3 years ago

Help!!!!!!!!!!!!!!!!!​

Help!!!!!!!!!!!!!!!!!