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PilotLPTM [1.2K]
2 years ago
11

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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marin [14]
The answer is D, the amount of energy stays the same.
3 0
3 years ago
A "590-W" electric heater is designed to operate from 120-V lines.
lukranit [14]

Answer:

a) 24.4 Ω

b) 4.92 A

c) 495.9 W

d)

c. It will be larger. The resistance will be smaller so the current drawn will increase, increasing the power.

Explanation:

b)

The formula for power is:

P = IV

where,

P = Power of heater = 590 W

V = Voltage it takes = 120 V

I = Current Drawn = ?

Therefore,

590 W = (I)(120 V)

I = 590 W/120 V

<u>I = 4.92 A</u>

<u></u>

a)

From Ohm's Law:

V = IR

R = V/I

Therefore,

R = 120 V/4.92 A

<u>R = 24.4 Ω</u>

<u></u>

c)

For constant resistance and 110 V the power becomes:

P = V²/R

Therefore,

P = (110 V)²/24.4 Ω

<u>P = 495.9 W</u>

<u></u>

d)

If the resistance decreases, it will increase the current according to Ohm's Law. As a result of increase in current the power shall increase according to formula (P = VI). Therefore, correct option is:

<u>c. It will be larger. The resistance will be smaller so the current drawn will increase, increasing the power.</u>

7 0
2 years ago
The tires on your truck have 0.35 m radius. In a straight line, you drive 2600 m. What is the angular displacement of the tire,
Travka [436]
1) In a circular motion, the angular displacement \theta is given by
\theta =  \frac{S}{r}
where S is the arc length and r is the radius. The problem says that the truck drove for 2600 m, so this corresponds to the total arc length covered by the tire: S=2600 m. Using the information about the radius, r=0.35 m, we find the total angular displacement:
\theta =  \frac{2600 m}{0.35 m} =7428 rad

2) If we put larger tires, with radius r=0.60 m, the angular displacement will be smaller. We can see this by using the same formula. In fact, this time we have:
\theta =  \frac{2600 m}{0.60 m}=4333 rad
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One isotope of a metallic element has the mass number 65 and 35 neutrons in the nucleus. the cation derived from the isotope has
Lina20 [59]
The mass number of an isotope is the sum of the numbers of protons and the numbers of the neutron. Given that the mass number is 65 and the number of neutrons is 35, the number of protons is 30. The atom is then Zinc (Zn). The charge is equal to +2, as it lacks 2 more electrons. 
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