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miv72 [106K]
3 years ago
6

MathematicsWhat is (4-x)(4-x)

Mathematics
1 answer:
Ksju [112]3 years ago
3 0

Step-by-step explanation:

(4-x)(4-x)=16-4x-4x+x= 16-7x

.........

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A 0. 0427 kg racquetball is moving 22. 3 m/s when it strikes a stationary box. The ball bounces back at 11. 5 m/s, while the box
andreyandreev [35.5K]

To solve the question we must know about the conservation of momentum.

<h2>Conservation of Momentum</h2>

According to the law of conservation of momentum, when two bodies collide with each other then their momentum is conserved if no external force acts on the system. therefore, the combined momentum of the two objects before collision will be equal to the combined momentum of the two objects after the collision.

the momentum of the two objects before the collision

                       = momentum of the two objects after the collision

The mass of the box is 0.30141 kg.

<h2>Explanation</h2>

Given to us

  • Mass of racquetball, m = 0.0427 kg,
  • Velocity of racquetball before Collision,  \bold{u_1} = 22.3 m/s,
  • Velocity of box before Collision,\bold{ u_2}  = 0 m/s,
  • Velocity of racquetball after Collision, \bold{v_1} = 11.5 m/s,
  • Velocity of box after Collision, \bold{v_2} = 1.53 m/s,

<h3>Assumption</h3>

Let the mass of the box be M.

<h3>Conservation Of Momentum</h3>

Momentum before collision = Momentum after collision

mu_1 + Mu_2 = mv_1 + Mv_2

given, the box was stationary before the collision,

mu_1 + Mu_2 = mv_1 + Mv_2\\\\&#10;mu_1 + 0 = mv_1 + Mv_2\\\\&#10;mu_1  - mv_1 = Mv_2\\\\&#10;M= \dfrac{mu_1  - mv_1}{v_2}

Substituting the values,

M= \dfrac{mu_1  - mv_1}{v_2}\\\\&#10;M = \dfrac{(0.0427 \times 22.3)  - (0.0427\times 11.5)}{1.53}\\\\&#10;M = 0.30141\ kg

Hence, the mass of the box is 0.30141 kg.

Learn more about Conservation of Momentum:

brainly.com/question/2141713

3 0
3 years ago
Need help please walk me through it
lions [1.4K]
The sum of the angles in a triangle is 180. Let x be one acute angle and y be the other. We know one is 5 times larger so let’s say 5x = y. Now,
x + y + 90 = 180
x + 5x + 90 = 180
6x + 90 = 180
6x = 90
x = 15

So y = 5x = 5(15) = 75

The two angles are 15 degrees and 75 degrees
7 0
3 years ago
A park is showing a movie on the lawn. The base of the screen is 6 feet off the ground and the screen is 22 feet high (see figur
inessss [21]

Answer:

A. 61.82°;

15.64°

B. 33.37°

Step-by-step explanation:

A.

✍️Angle of elevation from 15 ft:

A right triangle is formed. Apply trigonometric ratios formula to find the angle of elevation from 15 ft.

Thus,

Length of the side Opposite to reference angle = 22 + 6 = 28 ft

Adjacent length = 15 ft

Thus, we would have:

tan(\theta) = \frac{opp}{adjacent} = \frac{28}{15}

tan(\theta) = 1.8667

\theta = tan^{-1}(1.8667)

\theta = 61.82 (2 d.p)

✍️Angle of elevation from 100 ft:

Thus,

Length of the side Opposite to reference angle = 22 + 6 = 28 ft

Adjacent length = 100 ft

Thus, we would have:

tan(\theta) = \frac{opp}{adjacent} = \frac{28}{100}

tan(\theta) = 0.28

\theta = tan^{-1}(0.28)

\theta = 15.64 (2 d.p)

B.

✍️Distance you'd be from the screen if you lie on the ground and make an angle of elevation of 40° to the top of the screen:

Adjacent length = your distance from the screen = x

Opposite length = 22 + 6 = 28 ft

Angle of elevation = 40°

Tge trigonometric ratios formula to use would be:

tan(\theta) = \frac{opp}{adjacent}

Plug in the values

tan(40) = \frac{28}{x}

Multiply both sides by x

x*tan(40) = 28

Divide both sides by tan(40)

x = \frac{28}{tan(40)}

x = 33.37 (2 d.p)

3 0
3 years ago
Express 900 as a product of its prime factors in index form. Write the prime factors in ascending factors.
Lina20 [59]

Answer:

900 = 2 * 2 * 3 * 3 * 5 * 5 = 2^2 * 3^2 * 5^2

Step-by-step explanation:

900/2 = 450

450/2 = 225

225/3 = 75

75/3 = 25

25/5 = 5

5/5 = 1

900 = 2 * 2 * 3 * 3 * 5 * 5 = 2^2 * 3^2 * 5^2

7 0
3 years ago
X to the third plus 64 equal 0
GREYUIT [131]

x^3 + 64 = 0

Subtract both sides by 64:

x^3 = -64

x = -4

3 0
4 years ago
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