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4 years ago

Name the property used in: (5 + 2) + n = 7 + n

Mathematics

1 answer:

rjkz [21]4 years ago

5 0

Additive indentity
$(5 + 2) + n$
n = 1
a variable is always a number itself remember 7+n
5+2 = 7

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Two point particles are attached to each other via a light in-extensible string that passes over a ring hanging from the ceiling

arlik [135]

a. The expression for the tension in the string is T = mg

b. The expression for the tension in the chain is T = 2mg

To solve the problem, we need to know what tension is.

<h3>What is tension?</h3>

This is the opposing force in a stretched material.

<h3>a. Tension in the string</h3>

The expression for the tension in the string is T = mg

Since the string supports the weight of the object, the tension in the string equals the weight of the particle.

Let

T = tension in sring and
W = weight of particle = mg where
m = mass of particle and
g = acceleration due to gravity

So, T = W

T = mg

So, the expression for the tension in the string is T = mg

<h3>b. Tension in chain</h3>

The expression for the tension in the chain is T = 2mg

<h3 />

Since the chain supports both strings, the tension in the chain equals the tension in both strings.

Let

T' = tension in chain and
T = tension in each string

So, T' = T + T

T' = 2T

T' = 2W

T' = 2mg

So, the expression for the tension in the chain is T = 2mg

<h3 />

Learn more about tension here:

brainly.com/question/24994188

5 0

2 years ago

Please help! i couldnt copy and paste it into here so i decided to just screenshot it :)

zhuklara [117]

Answer: Congruent

How;

Congruent angles are angles that have equal degree measure! Hope this helps!

8 0

3 years ago

Read 2 more answers

22 divided by 8,956 as a mixed number in simplest form

VikaD [51]

Answer:

if the first number is less then the 2nd number its always 0..

Step-by-step explanation:

8 0

3 years ago

Pls answer Question 28 and 29 asap.

Kaylis [27]

28. Answer: 86% decrease

<u>Step-by-step explanation:</u>

Original Sphere has a radius of 100% → r =1

Surface Area of Original Sphere:

S.A. = 4πr²

= 4π(1)²

= 4π

New Sphere has a diameter of 75% → d = 0.75 → r = 0.375

Surface Area of New Sphere:

S.A. = 4πr²

= 4π(0.375)²

= 0.5625π

$\text{\% Change} =\dfrac{New - Original}{Original}\\\\.\qquad \qquad =\dfrac{0.5625\pi -4\pi}{4\pi}\\\\.\qquad \qquad =\dfrac{-3.4375\pi}{4\pi}\\\\.\qquad \qquad =-0.86$

<em>The negative sign represents a decrease.</em>

*********************************************************************************

29. Answer: 72 bottles

<u>Step-by-step explanation:</u>

Volume of a hemisphere is:

$V=\dfrac{2}{3}\pi r^3\\\\.\quad =\dfrac{2}{3}\pi (18)^3\\\\.\quad = 3888\pi$

Volume of a cylinder is:

$V=\pi r^2h\\\\.\quad =\pi (3)^2(6)\\\\.\quad =54\pi$

The number of cylinders needed is:

$\dfrac{3888\pi}{54\pi} = 72$

4 0

3 years ago

10 times as many as 6 hundreds is 60 thousand or 6 thousand

labwork [276]

6 thousands...........................

7 0

3 years ago

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