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2 years ago

I need some help with these two, im really struggling with them.

Physics

2 answers:

MatroZZZ [7]2 years ago

7 0

Answer:a)magnification means the ratio of image distance to object distance i.e

Explanation:

q/p=-2.5

Which means q=-2.5p

Or we can write

Image height (I)over object height (O)

I/O =-2.5

I =-2.5(O)

Which means image is greater by 2.5 times than object and negative sign shows that mirror is convex

Lisa [10]2 years ago

5 0

Answer:

In optics, a magnification refers to the process of enlarging the apparent size of an object, not the physical one, you can call it the virtual size of the object.

Specifically, magnification refers to the number as such, if it's less than one, it refers to a reduction size, which can also be called de-magnification.

For example, a convex lens make things look bigger, there's involved the magnification concept. Another popular example is a microcoscope, which makes small things to look bigger.

So, in this case, a maginification of -2.5 refers to de-magnification, because -2.5 < 1. Basically, the mirror will make objects seem smaller than the real one.

On the other hand, chromatic aberration occurs when a mirror is not able to bring all wavelengths colors into the same plane or focal point, that's why the image seems like distiorted.

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An object that has a small mass and an object that has a large mass have the same momentum. which object has the largest kinetic

castortr0y [4]

The larger mass object would have more kinetic energy. 1) its heavier 2) it covers a larger area 3) the more mass an object has, the larger the kinetic energy because of its weight.

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3 years ago

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sashaice [31]

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3 years ago

Moving the probe 1 cm towards the non-grounded electrode changes the value the potential from about 0.90 V to about 1.2 V. Expla

svp [43]

Answer:

-30 N/C

Explanation:

Since the potential changes from 0.90 V to 1.2 V when I move the probe 1 cm closer to the non-grounded electrode, the electric field is the gradient between the two points is given by E = -ΔV/Δx where ΔV = change in electric potential and Δx = distance of potential change = 1 cm = 0.01 m

Now ΔV = final potential - initial potential = 1.2 V - 0.90 V = 0.30 V

Since E = -ΔV/Δx

substituting the values of the variables into the equation, we have

E = -ΔV/Δx

E = -0.30 V/0.01 m

E = -30 V/m

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3 years ago

Heights of men on a baseball team have a bell-shaped distribution with a mean of 166 cm 166 cm and a standard deviation of 5 cm

kaheart [24]

Answer:

95 %

99.7 %

Explanation:

$\mu$ = 166 cm = Mean

$\sigma$ = 5 cm = Standard deviation

a) 156 cm and 176 cm

$166-5\times 2=156$

$166+5\times 2=176$

From the empirical rule 95% of all values are within 2 standard deviation of the mean, so about 95% of men are between 156 cm and 176 cm.

b) 151 cm and 181 cm

$166-5\times 3 =151$

$166+5\times 3=181$

The empirical rule tells us that about 99.7% of all values are within 3 standard deviations of the mean, so about 99.7% of men are between 151 cm and 181 cm.

3 0

3 years ago

20.0 moles, 1840 g, of a nonvolatile solute, C 3H 8O 3 is added to a flask with an unknown amount of water and stirred. The solu

Anastasy [175]

Answer:

0.144 kg of water

Explanation:

From Raoult's law,

Mole fraction of solvent = vapor pressure of solution ÷ vapor pressure of solvent = 423 mmHg ÷ 528.8 mmHg = 0.8

Let the moles of solvent (water) be y

Moles of solute (C3H8O3) = 2 mole

Total moles of solution = moles of solvent + moles of solute = (y + 2) mol

Mole fraction of solvent = moles of solvent/total moles of solution

0.8 = y/(y + 2)

y = 0.8(y + 2)

y = 0.8y + 1.6

y - 0.8y = 1.6

0.2y = 1.6

y = 1.6/0.2 = 8

Moles of solvent (water) = 8 mol

Mass of water = moles of water × MW = 8 mol × 18 g/mol = 144 g = 144/1000 = 0.144 kg

7 0

2 years ago