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2 years ago

Which statement accurately describes a relationship between two parts of the universe?

1 answer:

7 0

The statement which accurately describes a relationship between two parts of the universe is: there are billions of galaxies in a galaxy cluster

Option a is the correct answer

<h3>What is universe?</h3>

A universe comprises of all existing matter and space considered as a whole; the cosmos.

So therefore, the statement which accurately describes a relationship between two parts of the universe is: there are billions of galaxies in a galaxy cluster

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(II) How much work did the movers do (horizontally) pushing a 46.0-kg crate 10.3 m across a rough floor without acceleration, if

Gwar [14]

Answer:

2324 J

Explanation:

The formula for work is:

$W=F*d$

where $F$ is the force applied, and $d$ is the distance moved, in this case $d=10.3m$

and we need to find $F.$

Since the crate is not moving up or down, we conclude that the <u>normal force must be equal to the weight </u>of the object:

$N=w$

where $N$ is the normal force and $w$ is the weight, which is: $w=mg$ , where g is the gravitational acceleration $g=9,81m/s^2$ and $m$ is the mass $m=46kg$ .

---------

Thus the normal force is:

$N=mg$

Now, the force due to the friction is defined as:

$f=\mu N=\mu mg$

where $\mu$ is the coefficient of friction, $\mu =0.5$

So, for the crate to move, the force applied must be equal to the frictional force:

$F=f\\F=\mu mg$

And now that we know the force we can calculate the work:

$W=F*d\\W=\mu mg*d$

substituting known values:

$W=(0.5)(46kg)(9.81m/s^2)(10.3)\\W=2324J$

5 0

3 years ago

Read 2 more answers

What are the horizontal and vertical velocities of a stunt bike that leaves a ramp at 100 km/hr and at an angle of 35 degrees?

Alex787 [66]

Horizontal velocity: 81.9 km/h

Vertical velocity: 57.4 km/h

Explanation:

We can solve this problem by resolving the velocity vector into its component along the horizontal and vertical direction.

The horizontal velocity of the stunt bike is given by:

$v_x = v cos \theta$

where

v = 100 km/h is the magnitude of the velocity

$\theta=35^{\circ}$ is the angle of projection

Substituting, we find

$v_x = (100)(cos 35^{\circ})=81.9 km/h$

The vertical velocity instead is given by

$v_y = v sin \theta$

where

$v=100 km/h$

$\theta=35^{\circ}$

Substituting,

$v_y = (100)(sin 35^{\circ})=57.4 km/h$

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4 0

3 years ago

In 2006, there were 3,858 oil and gas platforms in the Gulf of Mexico. Oil platforms are used to extract oil and natural gas fro

VashaNatasha [74]

Answer:

Is a)

Explanation: i took the test so dw

5 0

4 years ago

A 20 kg block rests on a rough horizontal table. A rope is attatched to the block and is pulled with a force of 80 N to the left

Pani-rosa [81]

Given :

Mass of block , M = 20 kg .

Force applied , F = 80 N .

Acceleration of block , $a=2.5\ m/s^2$ .

To Find :

The coefficient is Kinetic force friction between the block and the table .

Solution :

We know , Force equation on block is given by :

$F_{net }=F-\mu_k mg \\\\ma = F-\mu_k mg \\\\20\times 2.5 = 80 -\mu_k \times 20 \times 10\\\\\mu_k\times 200=30\\\\\mu_k=\dfrac{30}{200}\\\\\ mu_k=0.15$

Therefore , coefficient is Kinetic force friction between the block and the table is 0.15 .

Hence , this is the required solution .

5 0

4 years ago

Given the recent evidence suggesting that species change due to a certain genetic variations, what would be true?

boyakko [2]

Answer:

c) mutation and natural selection both cause changes in a population

Explanation:

Hope it help

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6 0

3 years ago