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4 years ago

3) A 5kg block is hung from a spring. When the block is attached, the

Physics

1 answer:

belka [17]4 years ago

6 0

Answer:

24cm

Explanation:

Use Hooks Law; F=kx; F=Force, k=stiffness of the spring, x=distance.

k=F/x ; 5(9.8)/8 =6.125 N/cm

x=F/k 15(9.8)/6.125 = 24cm

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When a wave hits a boundary, what determines how much is reflected and refracted?

Dafna1 [17]

Answer:

Angle and speed of wave

Explanation:

The two phenomena involved here are:

- Reflection: reflection occurs when a light wave bounces off the interface between two mediums, returning into the first medium, at a different angle

- Refraction: refraction occurs when a light wave passes through the interface between the two mediums, passing into the second medium, changing direction and speed

The coefficient of reflection tells what is the fraction of the wave that is reflected over the total; it is calculated as

$R=|\frac{n_1 cos \theta_1 - n_2 cos \theta_2}{n_1 cos \theta_1 + n_2 cos \theta_2}|^2$

where

$n_1, n_2$ are the index of refraction of the 1st and 2nd medium

$\theta_1, \theta_2$ are the angle between the ray of light and the normal to the interface in the 1st and 2nd medium

From the formula, we see that the % of wave that is reflected depends on the angle and the index of refraction. Moreover, the index of refraction is related to the speed of the wave by:

$n=\frac{c}{v}$

where c is the speed of light in a vacuum and v the speed of light in the medium; therefore, the correct answer is

Angle and speed of wave

5 0

3 years ago

the attendance qt a seminar in a year 1 was 500 in year 2 the attendance changed by 100 what was the percent change in attendanc

TiliK225 [7]

20% change from year one to year two.

5 0

4 years ago

1. Which of the following would be a testable hypothesis?

Naddik [55]

B dropping a ball
C tentative and testable

7 0

3 years ago

Determine the value of n so that the vectors A and B are perpendicular: Ā = î + 5j + nk and B = 2î - j + k

Tanya [424]

If $\vec A$ and $\vec B$ are perpendicular, then their dot product is zero. This means

$\vec A \cdot \vec B = (\vec\imath + 5\,\vec\jmath + n\,\vec k) \cdot (2\,\vec\imath - \vec\jmath + \vec k) = 2 - 5 + n = 0$

Solving for n is trivial; it follows that n = 3.

6 0

2 years ago

How do you write 0.345 in scientific notation?

GenaCL600 [577]

Answer;

3.45 × 10^-1

Explanation;

-Here we wish to write the number 0.345 as a coefficient times 10 raised to an exponent. To convert to scientific notation, start by moving the decimal place in the number until you have a coefficient between 1 and 10; here it is 3.45.

-The number of places to the left that you had to move the decimal point is the exponent.

= 0.345

= 3.45/10

= 3.45 × 10^-1

6 0

3 years ago