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Setler79 [48]
3 years ago
12

A farsighted woman breaks her current eyeglasses and is using an old pair whose refractive power is 1.570 diopters. Since these

eyeglasses do not completely correct her vision, she must hold a newspaper 42.00 cm from her eyes in order to read it. She wears the eyeglasses 2.00 cm from her eyes. How far is her near point from her eyes
Physics
1 answer:
vaieri [72.5K]3 years ago
3 0

Answer:

Explanation:

The refractive index of the lens is

d = 1.570 dioptres

Therefore, her focal length is

f = 1 / d

f = 1 / 1.570

f = 0.6369 m

f = 63.69cm

The distance between the newspapers and her eyes is 42cm

Distance from her eye to the glasses is 2cm

We want to calculate her near point?

So, the distance between the newspaper and the glass

do = 42 - 2 = 40cm

The distance between the glass and the virtual image formed is given as

di = f•do / (do —f)

di = 63.69 × 40 / (40 — 63.69)

di = 2547.6cm / -23.69

di = —107.54cm

The relation use is obtain from the lens equation and the negative shows that virtual image formed.

The near point from her eye is

107.54 + 2 = 109.54cm

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You throw a balloon that floats in the air with a velocity of 2 m / s south . If the wind speed is 5 m / s west , how far south
zvonat [6]

Answer:

The distance traveled by the balloon is 10.77 m

Explanation:

velocity of the ball, v_b = 2 m/s south

velocity of the air, v_a = 5 m/s west

To determine the distance the balloon will travel after 2 seconds, first determine the resultant velocity of the balloon.

                                       | 2m/s

                                       |

                                       |

                                      ↓

      5m/s  ←------------------

the two velocities forms a right angled triangle and the resultant will be the hypotenuses side of the triangle.

R² = 5² + 2²

R² = 29

R = √29

R = 5.385 m/s

The distance traveled by the balloon is calculated as;

d = R x t

where;

t is time of the motion = 2 seconds

d = 5.385 x 2

d = 10.77 m

Therefore, the distance traveled by the balloon is 10.77 m.

4 0
3 years ago
A car is traveling at a speed of 45 km/h into town. It takes the car 2 hours to get there. How far has the car traveled?
hjlf

Answer:

90 km

Explanation:

45 km per hr

2 hrs

45 x 2 = 90

90 km/2 hrs

Hope this helps!

7 0
3 years ago
Read 2 more answers
A light-year is the distance light travels in one year (at speed = 2.998 × 108 m/s). (a) how many meters are there in 11.0 light
larisa [96]
<span>The answers are as follows:

(a) how many meters are there in 11.0 light-years?

11.0 light years ( 365 days / 1 year ) ( 24 h / 1 day ) ( 60 min / 1 h ) ( 60 s / 1 min ) ( 2.998x10^8 m/s ) = 1.04x10^17 m

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1.04x10^17 m ( 1 au / </span>1.50 × 10^8 km <span>) ( 1 km / 1000 m) = 693329.472 au

(c) what is the speed of light in au/h? au/h

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8 0
3 years ago
What is the surface area to volume ratio of this cube
tamaranim1 [39]

I can't see that cube from here.

But if the length of the side of the cube is ' K ' units,
then the surface area of the cube is  6K² units², and
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The ratio of the surface area to the volume is

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So for example, if the side of the cube is 2 inches, then
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That's the answer.  I did the whole thing in order to earn
the points, but I don't expect you to understand much of it,
because I see from your username that you suck at math.
I'm sorry you decided that.  Now that you've put up the
brick wall, it'll be even harder for any math to find its way
in there, and you'll miss out on a lot of the fun.

3 0
3 years ago
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agasfer [191]

Answer:

Clarify any confusing information in the instructions.

Purchase the equipment and chemicals you will need.

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8 0
3 years ago
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