PHYSICS HIGH SCHOOL

Which lighting direction is used to create silhouettes?

Answers

Answer 1
Answer: Backlighting is used to create silhouettes 

HOPED I HELPED
Answer 2
Answer:

Backlight is the answer

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An explosion that destroys a massive star is called a A. nebula. B. supernova. C. black hole. D. vacuum.
A train is accelerating at a rate of 2 km/hr/s.  If its initial velocity is 20 km/hr, what is its velocity after 30 seconds?
Explain what it means when we describe an ecosystem as being in equilibrium
________ is the ability to see objects at a distance but not things that are close, while _________ is the ability to see close objects but not things that are at a distance.

Which of the following shows the abbreviation for a unit of density? (a) lb/mL
(b) g/cm
(c) g/cm3
(d) L/kg

Answers

c) gram/centimeters^3

Answer:

g/ml

Explanation:

Thermal energy is added to a sample, its particles move ?

Answers

Yes, if the temperature increases, than that means the particles are moving faster. Temperature is the measure of movement of particles in an object or substance.

By thermal energy, you mean adding heat correct....? I'm not very good at this sort of thing, but I gave you what I have..

A freight train completes its journey of 150 miles 1 hour earlier if its original speed is increased by 5 miles/hour. Give the original speed of the train. a. 20 miles/hour b. 25 miles/hour c. 30 miles/hour d. 35 miles/hour

Answers

The answer is B

If we assign speed  variable x; and time variable y; then;

xy=150

(y-1) (x+5) = 150

xy + 5y  - x – 5 = 150

(remember xy = 150), therefore;

5y – x = 5

X = 25

Y = 6
150(x+5)-150x=x(x+5)
150x+750-150x=x^2+5x
x^2+5x-750=0
(x-25)(x+30)=0
x=25

Why are gases good at transferring heat through convection?

Answers

Because gases flow easily.  A hot batch of gas can rise through
the surrounding gas a lot easier than, say, a hot batch of mud can
rise through the surrounding mud.

Answer: The particles can slide past one another.

Explanation : 'The heat energy moves through the material as the particles tin the material move through the material' .

A 4.0-kilogram ball moving at 8.0 m/s to the right collides with a 1.0-kilogram ball at rest. After the collision, the 4.0-kilogram ball moves at 4.8 m/s to the right. What is the velocity of the 1-kilogram ball?

Answers

Use conservation of momentum.  Check to see if your answer makes sense.  A heavy ball moving right hits a stationary ball.  Afterwards they should both be moving right and the lighter ball should be moving faster.

Which of the following accurately describes the differences between the SI and English systems of measurement? A. The two systems are used interchangeably in the scientific and technical communities.

B. The English system is more commonly used in Europe than in the United States.

C. The English system is preferred for use in the scientific and technical communities due to its ease of use over the SI system.

D. The SI system, which is based on the metric system, has been more widely adopted than the English system, which is harder to use.

Answers

The best answer is D. The SI system, which is based on the metric system, has been more widely adopted than the English system, which is harder to use. In order to standardize measurements, the International System of Units or the SI units are commonly used around the world since they are more easy to understand and compare than the English unit.
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