PHYSICS HIGH SCHOOL

What are light years actually? answer in brief

Answers

Answer 1
Answer: A light year is a distance. 
It's the distance that light travels in a year, through vacuum.
The distance is about 5.875 trillion miles. 
The nearest star outside our solar system is about 4.2 light years from us.

Sorry to have rambled on for so long.

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Why is there less air pressure at higher altitudes?Air at higher altitudes doesn't have as much air weighing down on it from above.Air at higher altitudes is cooler and less turbulent.The molecules in the air lose mass and are less effected by gravity, significantly lowering their weightThe warmer, lighter air rises bringing cooler heaver air to low altitudes.
A car speeds up from 65 m/s to 120m/s in 9s. What is the acceleration of the car
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All of the following are reasons that psychologists use a systematic method to conduct research except __________.

What is the currency for performing work and what is its unit?

Answers

The currency for performing work is called : Energy

And Energy's unit of measurement is : Joule

The amount of energy you've inputed will always equal the output.

For example, in order to do a 500 joules of work, you need 500 joules of energy

Answer:

The currency for performing work is called : Energy

And Energy's unit of measurement is : Joule

The amount of energy you've inputed will always equal the output.

For example, in order to do a 500 joules of work, you need 500 joules of energy

Explanation:

Displacement is the change in velocity of an object.

True or false

Answers


Words less true are seldom if ever spoken.
False, it is the change in distance. Chance in velocity would be Δv

When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion? A.
-1

B.
-2

C.
+2

D.
+1

Answers

-2. This is because it is gaining electrons. Electrons are negative. Therefore it is a negative charge.

4. The density and strength of concrete are determined by the ratio of cement and aggregate. Suppose that a contractor has 480 cubic feet of a dry concrete mixture that is 70% sand by volume. How much pure sand must be added to form a new mixture that is 75% sand by volume?

Answers

Answer:

The answer is 96ft^3

Explanation:

T=initial concrete mixture

S1=initial amount of sand

S2=final amount of sand

T2=final amount concrete mixture

C=amount of cement

Data:

T=480Ft^3

 the quantities of the initial mixture are

S=0.7*480=336Ft^3

C=0.3*480=144 Ft^3

 we pose the following equations

144+S2=T2

T2*0.75=S2  

if we solve

S2=144/(1/0.75-1)=432ft^3

to know how much we should add we subtract it from the initial amount of sand

Answer=432ft^3-336ft^3=96ft^3

Determine the resistance of 100m of copper cable whose cross-sectional area is 1.5mm2​

Answers

20*% is that one trust meeeeee

Secondary evidence is the basis for drawing scientific conclusions.
a. True
b. False

Answers

The answer is false! Hope that helps! :) 

The answer would be, B-False
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