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3 years ago

Which one of the following statements is true? Explain.

Physics

1 answer:

Makovka662 [10]3 years ago

5 0

Answer:

All the given option is false.

Explanation:

This is not true for all the materials like composite because the Poisson ratio for composite material can be negative that is why positive tensile stress may produce positive lateral strain.

This is not true for all the material because the Poisson ratio for some material can be positive that is why positive tensile stress may produce negative lateral strain.

The explanation is same as option A.

This is not true for all the materials ,It is valid only up to elastic limit .After the elastic limit the strain and stress does not follow linear path.

This is not true for all the materials because some materials like composite is having negative value of Young's modulus.

Therefore all the given option is false.

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You hold a spherical salad bowl 50 cm in front of your face with the bottom of the bowl facing you. The salad bowl is made of po

nataly862011 [7]

Answer:

a) q = 39.29 cm , b) h ’= - 3.929 cm the image is inverted and REAL

Explanation:

For this exercise we will use the equation of the constructor

1 / f = 1 / p + 1 / q

where f is the focal length of the salad bowl, p and q are the distance to the object and the image

The metal salad bowl behaves like a mirror, so its focal length is

f = R / 2

f = 44/2

f = 22 cm

a) Suppose that the distance to the object is p = 50 cm, let's find the distance to the image

1 / q = 1 / f - 1 / p

1 / q = 1/22 - 1/50

1 / q = 0.0254

q = 39.29 cm

b) to calculate the size of the image we use the equation of magnification

m = h’/ h = - q / p

h ’= - q / p h

h ’= - 39.29 / 50 5

h ’= - 3.929 cm

the negative sign means that the image is inverted

as the rays of light pass through the image this is REAL

4 0

4 years ago

Bottlenose dolphins use echolocation pulses with a frequency of about 100 kHz, higher than the frequencies used by most bats. Wh

Alinara [238K]

Answer:

1. greater

2. direct

3. smaller

4. inverse

Explanation:

The speed of sound in water is greater than in air; hence for the same frequency the sound wavelength in water is greater than in air (for the given frequency the wavelength is in the direct proportion with the speed of sound).

To "see" an object via the echolocation creature needs to use sound with the wavelength smaller than the size of an object viewed.

That means to "see" objects of the same size dolphin and bat need to use ultrasound of the same wavelength, hence dolphin needs to use higher frequency (for the given speed of sound the wavelength is in inverse proportion with the frequency).

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3 years ago

Why do ultraviolet rays from the sun reach earth

slamgirl [31]

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learned this in my class.. Hope it helps. :)

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3 years ago

If you're not satisfied with your fitness evaluation score, there's really little you can do about it.

BARSIC [14]

Answer:

False

Explanation:

3 0

3 years ago

Read 3 more answers

The picture shows three sets of balloons, all with a particular charge. Which of the picture(s) is true? Please explain.

devlian [24]

Letter C has the correct illustration. Two objects with the same charge (in this case, both are positively charged) will repel each other. 

Letter A is incorrect because a positive charged object will attract a negatively charged object.

Letter B is incorrect because both of them are negatively charged, which means they should be repelling each other.

6 0

3 years ago