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3 years ago

Jalen is sliding around on his kitchen floor in his

Physics

1 answer:

tresset_1 [31]3 years ago

5 0

Answer:

his feet feel warmer because of friction. when friction takes place then an object will warm up because friction is a universal law that always takes place. if you rub your hands together, you also experience the heat of frictional I hope that helped.

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A stone with a weight of 5.30 N is launched vertically from ground level with an initial speed of 23.0 m/s, and the air drag on

frozen [14]

Answer:

a) $h=25.7\ m$

b) $v'=21.8733\ m.s^{-1}$

Explanation:

Given:

weight of the stone, $w=5.3\ N$

initial velocity of vertical projection, $u=23\ m.s^{-1}$

air drag acting opposite to the motion of the stone, $D=0.266\ N$

The mass of the stone:

$m=\frac{w}{g}$

$m=\frac{5.3}{9.8}$

$m=0.5408\ kg$

Now the acceleration of the stone opposite of the motion:

$D=m.d$

where:

d = deceleration

$0.266=0.5408\times d$

$d=0.4918\ m.s^{-2}$

<u>In course of going up the net acceleration on the stone will be:</u>

$g'=g+d$

$g'=9.8+0.4918$

$g'=10.2918\ m.s^{-2}$

Now using the equation of motion:

$v^2=u^2-2 g'.h$

where:

$v=$ final velocity when the stone reaches at the top of the projectile = 0

h = height attained by the stone before starting to fall down

$0^2=23^2-2\times 10.2918\times h$

$h=25.7\ m$

during the course of descend from the top height of the projectile:

initial velocity, $v=0\ m.s^{-1}$

The acceleration will be:

$g"=g-d$

$g"=9.8-0.4918$

$g"=9.3082\ m.s^{-2}$

here the gravity still acts downwards but the drag acceleration acts in the direction opposite to the motion of the stone, now the stone is falling down hence the drag acts upwards.

Using equation of motion:

$v'^2=v^2+2g".h$ (+ve acceleration because it acts in the direction of motion)

$v'^2=0^2+2\times 9.3082\times 25.7$

$v'=21.8733\ m.s^{-1}$

8 0

2 years ago

Malik formed a hypothesis that an increase in atmospheric oxygen levels by 10% would cause red-legged grasshoppers to grow large

worty [1.4K]

<h2>Answer:</h2>

The option C is the correct answer.

Which is, "He varies the nitrogen and carbon dioxide levels in the air from one trial to the next".

<h3>Explanation:</h3>

The hypothesis of Malik was about the effect of increased oxygen level on the growth of the red-legged grasshoppers.

So the areas of his experiment should be the:

Grasshopper type.
High oxygen level.
Rate of growth of grasshopper.

So all the given options are relevant to his experiment except the third one.

So varying the nitrogen and carbon dioxide level in air could not contribute in his experiment.

<h2 />

8 0

2 years ago

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Oysters are filter feeders. They get their food by moving large amounts of water through their bodies and filtering out whatever

Lynna [10]

A. Oysters, clams, and other shellfish are efficient filter feeders that help remove excess nitrogen from waters by incorporating it into their shells and tissue as they grow. ... Adult oysters reportedly can filter up to 50 gallons a day, while large quahogs (hard clams) can clean about 24 gallons of water a day

8 0

2 years ago

How many sets of planets would you need to create the mass of the Sun?

kow [346]

Answer:

volume about 1.3 million Earths could fit inside the Sun the mass of the Sun is 1.989 X 10 to the 30 kg about 333000 times the mass of the Earth

Explanation:

step-by-step explanation hope this answer your question

6 0

2 years ago

Look at this picture of a frog.

fredd [130]

Answer:

Biosphere

Explanation:

The biosphere consist of all living organisms

6 0

3 years ago

Read 2 more answers