Whats 2+2? first one gets 100 points and brainlyest

How many seconds will light leaving Los Angeles take to reach the following locations (a) San Francisco (about 500km), (b) Londo

kondor19780726 [428]

Answer:

a) It takes 0.0017s for the light to reach San Francisco.

b) It takes 0.033s for the light to reach London.

c) It takes 1.334s for the light to reach Mars.

d) It takes 149.7s for the light to reach Venus.

Step-by-step explanation:

Here we can solve this problem by using this following formula:

$s = \frac{d}{t}$

In which s is the speed(in km/s), d is the distance(in km) and t is the time(in s).

The light speed is 299 792 458 m / s = 299,792.458 km/s, so $s = 299,792.458$

(a) San Francisco (about 500km)

Find t when $d = 500$ . So

$s = \frac{d}{t}$

$299,792.458 = \frac{500}{t}$

$299,792.458t = 500$

$t = \frac{500}{299,792.458}$

$t = 0.0017s$

It takes 0.0017s for the light to reach San Francisco.

b) London(about 10,000km)

Find t when $d = 10,000$ . So

$s = \frac{d}{t}$

$299,792.458 = \frac{10,000}{t}$

$299,792.458t = 10,000$

$t = \frac{10,000}{299,792.458}$

$t = 0.033s$

It takes 0.033s for the light to reach London.

(c) the Moon (400,000km)

Find t when $d = 400,000$ . So

$s = \frac{d}{t}$

$299,792.458 = \frac{400,000}{t}$

$299,792.458t = 400,000$

$t = \frac{400,000}{299,792.458}$

$t = 1.334s$

It takes 1.334s for the light to reach Mars.

(d) Venus (0.3 A.U. from Earth at its closest approach).

Each A.U. has 149,59,7871 km.

So 0.3 A.U. = 0.3*(149,597,871) = 44,879,361.3. This means that $d = 44,879,361.3$ . So:

$s = \frac{d}{t}$

$299,792.458 = \frac{44,879,361.3}{t}$

$299,792.458t = 44,879,361.3$

$t = \frac{44,879,361.3}{299,792.458}$

$t = 149.7s$

It takes 149.7s for the light to reach Venus.

3 0

3 years ago

Tara uses 8.8 pints of white paint and blue paint to paint her bedroom walls. 4 5 of this amount is white paint, and the rest is

liberstina [14]

Answer:

the blue paints of 1.76 pints is used to paint her bedroom walls

Step-by-step explanation:

Given that

Tara uses 8.8 pints of white paint

And, the 4 by 5 of this amount represent the white paint

We need to find out the number of paint used by the blue paint

So,

= 8.8 - (8.8 × 4 ÷ 5)

= 8.8 - 7.04

= 1.76 pints

Hence, the blue paints of 1.76 pints is used to paint her bedroom walls

6 0

3 years ago

jayden and chandra are cleaning the house. it has 12 rooms, and each room is about the same size. when jayden cleans by himself,

sergij07 [2.7K]

Jayden's work rate is twice Chandra's work rate, and, the rooms cleaned

by Jayden is twice the number of rooms cleaned by Chandra.

Response:

<u>Jayden cleans 8 rooms while Chandra cleans 4 rooms</u>

<h3>Which method can be used to find the number of rooms cleaned by Jayden and Chandra?</h3>

Number of rooms in the house = 12

The time that Jayden takes to clean the house = 6 hours

Time that it takes Chandra to clean the house by herself = 12 hours

Time it takes both of them to clean the house = 4 hours

Required:

The number of rooms that Jayden clean and the number of rooms that

Chandra cleans when they work together.

Solution:

Given that the time it takes Jayden to clean the house is half the time

taken by Chandra.

Therefore;

The number of rooms Jayden cleans in 4 hours is twice the number of rooms cleaned by Chandra, which gives;

Ratio of the number of rooms cleaned by Jayden to the number cleaned by Chandra is 2 : 1

Total number of rooms cleaned = 12

$Number \ of \ rooms \ cleaned \ by \ Jayden = \dfrac{2}{2 + 1} \times 12 = \underline{8 \ rooms}$

The number of rooms cleaned by Chandra = 12 - 8 = <u>4 rooms</u>

Learn more about ratios here:

brainly.com/question/3568924

6 0

2 years ago

HELPELEPLEPELP this needed to be done last week LSMOAJOMOSN

denpristay [2]

Answer:

1/1

Step-by-step explanation:

try that if that doesnt work try 1 the question was confusing im sorry if its wrong...

3 0

3 years ago

PLEASE HELP ASAP

grigory [225]

Answer:

Therefore

$x=27$

$WX=85\ unit\\\\XY=85\ unit\\\\WY=104\ unit$

Step-by-step explanation:

Given:

triangle WXY is an isosceles triangle,

WX ≅ XY

WX = 6x-77

XY = 3x+4 and

WY = 5x-31

To Find

x = ?

measurements of each side = ?

Solution:

Δ WXY is an Isosceles Triangle ..Given

WX ≅ XY ...........Given

Substituting the values we get

$6x-77=3x+4\\\\6x-3x=77+4\\\\3x=81\\\\x=\dfrac{81}{3}\\\\\therefore x=27$

Now Substituting 'x' in WX, XY, and WY we get

$WX=6\times 27-77=85\ unit\\\\XY=3\times 27+4 =85\ unit\\\\WY=5\times 27 -31=104\ unit$

Therefore

$x=27$

$WX=85\ unit\\\\XY=85\ unit\\\\WY=104\ unit$

8 0

3 years ago

Whats 2+2? first one gets 100 points and brainlyest​

Whats 2+2? first one gets 100 points and brainlyest