PHYSICS MIDDLE SCHOOL

A 2-kg object is moving horizontally with the speed of 4m/s. How much net force is required to keep the object moving at this speed in this direction?

Answers

Answer 1
Answer: Force is only required to CHANGE speed or direction ... not to maintain it.

The net requirement is zero.
(in any direction)

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0.00000231 in scientific notation is

Answers

Answer:

2.31×10-⁶ is scientic notaion of 0.00000231

Final answer:

The number 0.00000231 is written as 2.31 x 10^-6 in scientific notation. Scientific notation represents numbers as a mantissa (between 1 and 10) multiplied by 10 raised to an exponent.

Explanation:

The number 0.00000231 in scientific notation is written as 2.31 x 10-6. In scientific notation, a number is represented as a number between 1 and 10 (known as the mantissa) multiplied by 10 raised to a power (the exponent). In this case, 2.31 is your mantissa and -6 is your exponent. The negative exponent indicates that the original number was less than 1, and the 6 indicates how many places the decimal was moved to the right to obtain the mantissa.

Learn more about scientific notation here:

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A wave has a wavelength of 125 meters is move a distance of 300 m in 15s. What is its frequency? please help

Answers

   Frequency of any wave  =  (speed) / (wavelength)

                                           = (300m / 15s)  /  (125m)

                                           =  (300m)  /  (15s x 125m)

                                           =      (300) / (15 x 125)    (m/s-m)

                                           =             0.16 / sec  =  0.16 Hz . 

Identify each wave interaction based on how it changes direction. The wave changes direction as it bends and scatters. _______

The wave changes direction as it changes its speed. _______

The wave changes direction at an angle equal to the angle of incidence. ________
diffraction
reflection
refraction

PLEASE HELP!!

Answers

Answer:

Here is the answer.

Explanation:

The answers are:

1. Diffraction

2. Refraction

3. Reflection

Hope this helps!

An optical fiber can make a light beam travel in a path that is curved or twisted? True or False

Answers

Answer:

True

Explanation:

An optical fiber is like a glass tube with very small radius. The light travels through these fiber following Total Internal Reflection principle. The movement of the light is not affected by the external factor or the shape of the fiber as long as it is intact. Even if it is twisted or curved, the light will travel as long as the fiber is not damaged physically.
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      the correct answer is true
 
          
    i hope that i have helped

A light shines up from the bottom of a fish pond.Which diagram shows the correct path of light as it leaves the water of the pond and hits the air?

Answers

For the question "A light shines up from the bottom of a fish pond. Which diagram shows the correct path of light as it leaves the water of the pond and hits the air?" The second diagram is the correct answer. Water has a higher refractive index than air so the ray of light passing from water to air will be refracted away from the normal (the vertical) towards the surface of the water.

How is sound is different from music how loundness od sound mention some ways to reduce

Answers

not too sure on this one maybe to locate objects under water, to diagnose problems, to treat medical ailments
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