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2 years ago

Which of the following is not physically possible?

Physics

1 answer:

nikklg [1K]2 years ago

6 0

Answer:

(a) -550 °F

Explanation:

No temperature below absolute zero is possible.

Absolute zero on the Fahrenheit scale is -459.67 °F. A temperature of -550 °F is less than that, so is not physically possible.

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calculate the acceleration of Airplane that starts at rest and reaches the speed of 45M/S in nine seconds

andreyandreev [35.5K]

Acceleration = (Speed or velocity) / Time

= 45/9

= 5 m/s²

5 0

3 years ago

"A steel rotating-beam test specimen has an ultimate strength of 120 kpsi. Estimate the life of the specimen if it is tested at

MrRissso [65]

Answer:

life (N) of the specimen is 117000 cycles

Explanation:

given data

ultimate strength Su = 120 kpsi

stress amplitude σa = 70 kpsi

solution

we first calculate the endurance limit of specimen Se i.e

Se = 0.5× Su .............1

Se = 0.5 × 120

Se = 60 kpsi

and we know strength of friction f = 0.82

and we take endurance limit Se is = 60 kpsi

so here coefficient value (a) will be

a = $\frac{(f\times Su)^2}{Se}$ ......................1

put here value and we get

a = $\frac{(0.82\times 120)^2}{60}$

a = 161.4 kpsi

so coefficient value (b) will be

b = $-\frac{1}{3}log\frac{(f\times Su)}{Se}$

b = $-\frac{1}{3}log\frac{(0.82\times 120)}{60}$

b = −0.0716

so here number of cycle N will be

N = $(\frac{ \sigma a}{a})^{1/b}$

put here value and we get

N = $(\frac{ 70}{161.4})^{1/-0.0716}$

N = 117000

so life (N) of the specimen is 117000 cycles

7 0

4 years ago

Please help on this one

Oksi-84 [34.3K]

When a hypothesis is confirmed true by evidence from many experiments, it becomes widely accepted by scientists, and it gets a new name: 'Theory' .

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3 years ago

Which of the following statements does not represent assumptions that stage theories share?

sasho [114]

C. A child can pass through the stages in any order.

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3 years ago

Virtue is _______________ between the extremes of vice – excess and deficiency.

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<span>Having high standards and honesty in the behavior is called a virtue and the person is considered virtuous. Usually virtue is mean between two extremes as that mid ground gives a balance to the behavior. Virtues are means between the extremes of vices which are excess and deficiency.</span>

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4 years ago