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3 years ago

Light waves from the sun can travel trough outer space and reach the earth

Physics

1 answer:

konstantin123 [22]3 years ago

7 0

Answer:

this is true

Explanation:

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What is the relationship between speed and the slopes of the lines on a graph

Strike441 [17]

There relationship can be the same in a way because both of those slopes can increase

8 0

3 years ago

A certain gasoline engine has an efficiency of 35.3%. What would the hot reservoir temperature be for a Carnot engine having tha

levacccp [35]

Answer:

The temperature of hot reservoir is 669.24 K.

Explanation:

It is given that,

Efficiency of gasoline engine, $\eta=35.3\%=0.353$

Temperature of cold reservoir, $T_C=160^{\circ}C=433\ K$

We need to find the temperature of hot reservoir. The efficiency of Carnot engine is given by :

$\eta=1-\dfrac{T_C}{T_H}$

$T_H=\dfrac{T_C}{1-\eta}$

$T_H=\dfrac{433}{1-0.353}$

$T_H=669.24\ K$

So, the temperature of hot reservoir is 669.24 K. Hence, this is the required solution.

4 0

3 years ago

Which could be an example of an unbalanced force?

vagabundo [1.1K]

Answer:i think its D

Explanation:

5 0

3 years ago

This type of soil is found in warm, humid climates. Question 4 options: pedocal laterite pedalfer humus

Oksi-84 [34.3K]

Answer:

Laterite is your correct answer

Explanation:

Well i took the quiz and made a %100 meaning i am correct.

7 0

3 years ago

A piece of wire 25 m long is cut into two pieces. One piece is bent into a square and the other is bent into an equilateral tria

Dmitry [639]

Answer:

10.87 m

Explanation:

Total length of the wire = 25 m

Let the length of one piece is y and other piece is 25 - y

Let the side of square is a.

So, 4 a = y

a = y / 4

And the side of triangle is b

3 b = (25 - y)

b = (25 - y) / 3

Area of square, A1 = side x side =

A1 = y² / 16

Area of equilateral triangle, A2 = $\frac{\sqrt{3}}{4}\times b^{2}$

$A_{2}=\frac{\sqrt{3}}{4}\frac{\left ( 25-y \right )^{2}}{9}$

Total area, A = A1 + A2

$A=\frac{y^{2}}{16}+\frac{\sqrt{3}}{4}\frac{\left ( 25-y \right )^{2}}{9}$

For maxima and minima, fins dA /dy

$\frac{dA}{dy}=\frac{y}{8}-\frac{1.732}{18} \times \frac{25-y}{1}$

It is equal to zero.

$\frac{y}{8}=\frac{1.732}{18} \times \frac{25-y}{1}$

9y = 173.2 -6.928 y

15.928 y = 173.2

y = 10.87 m

So, the length of wire to make square is 10.87 m.

3 0

3 years ago