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3 years ago

What are two main forces that act in gases in a star?

Physics

2 answers:

Paha777 [63]3 years ago

8 0

Answer:

hydrogen and helium

Explanation:

the sun is so hot that the huge amount of hydrogen is undergoing a constant star wide nuclear reaction

finlep [7]3 years ago

6 0

Answer:

the correct answer is C and D

I took a test hope it helps

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How is Oil bad for the environment?

stepladder [879]

Oil spill on land and in the oceans and kills wildlife like the great barear reef

6 0

3 years ago

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How much would it cost to cover the entire land area of United States with dollar bills? To answer this question, you may find t

s2008m [1.1K]

Answer:

It would cost approximately $925,455,484 million to cover continental US and Alaska with $1 bills.

Explanation:

the area of a one dollar bill = 6.5 cm x 15.5 cm = 100.75 sq cm

the approximate area of continental US + Alaska = (1,000 miles x 3,000 miles) x 1.2 = 3,600,000 sq miles

each sq mile is roughly 2.58999 sq km, so the total area in sq km = 9,323,964 sq km

1 sq km = 1,000,000 sq meters

each sq meter = 10,000 sq cm

1 sq m = 10,000 / 100.75 = 99.25558 bills

1 sq km = 99,255,583.13 bills

9,323,964 sq km = 925,455,483,900,000 bills

8 0

4 years ago

Read 2 more answers

Using at least 3 to 4 complete content related sentences describe the first and second postulate of special relativity.

Andrew [12]

Nothing can travel faster than the speed of light. As such, perceptions of objects and time change as they approach light speed, but the laws of physics remain consistent regardless of speed. Objects will appear shortened and time will appear to slow down around an observer approaching near light speeds, but all quantities still exist as they did before and all causality is preserved, even if observers in different points or traveling at different speeds will report different things.

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4 years ago

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Based on the data in the table, what will happen when a sound wave travels from copper into lead?

Lynna [10]

Answer:

A i believe

Explanation:

8 0

3 years ago

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A microscope has an eyepiece with a 1.8 cm focal length and a 0.8 cm focal length objective lens. Assuming a relaxed eye, calcul

igomit [66]

Answer:

$0.848\ \text{cm}$

$232.66$

Explanation:

N = Near point of eye = 25 cm

$f_o$ = Focal length of objective = 0.8 cm

$f_e$ = Focal length of eyepiece = 1.8 cm

l = Distance between the lenses = 16 cm

Object distance is given by

$v_o=l-f_e\\\Rightarrow v_o=16-1.8\\\Rightarrow v_o=14.2\ \text{cm}$

$u_o$ = Object distance for objective

From lens equation we have

$\dfrac{1}{f_o}=\dfrac{1}{u_o}+\dfrac{1}{v_o}\\\Rightarrow u_o=\dfrac{f_ov_o}{v_o-f_o}\\\Rightarrow u_o=\dfrac{0.8\times 14.2}{14.2-0.8}\\\Rightarrow u_o=0.848\ \text{cm}$

The position of the object is $0.848\ \text{cm}$ .

Magnification of eyepiece is

$M_e=\dfrac{N}{f_e}\\\Rightarrow M_e=\dfrac{25}{1.8}\\\Rightarrow M_e=13.89$

Magnification of objective is

$M_o=\dfrac{v_o}{u_o}\\\Rightarrow M_o=\dfrac{14.2}{0.848}\\\Rightarrow M_o=16.75$

Total magnification is given by

$m=M_eM_o\\\Rightarrow m=13.89\times 16.75\\\Rightarrow m=232.66$

The total magnification is $232.66$ .

3 0

3 years ago