Need help!!! Physics due tomorrow help, help ,help

Physics

1 answer:

kicyunya [14]3 years ago

6 0

I don't know, but for 5, to keep an object still( in zero gravity), both of the forces must be equal. Just a guess. I am in 8th grade math.

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Ice cubes,icicles,snowflakes, and glaciers are water in..

IRISSAK [1]

Those are in a solid state.

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3 years ago

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The volume of a gas is 200.0 mL at 275 K and 92.1 kPa. Find its volume at STP.

ycow [4]

To solve this question we will use ideal gas equation:
$p*V=n*R*T$
Where:
p = pressure
V = volume
n = number of moles
R = gas constant
T = temperature

We can rearrange formula to get:
$\frac{p*V}{T} =n*R$
We are working woth same gas so we can write following formula. Index 1 stands for conditions before change and index 2 stands for conditions after change.
$\frac{ p_{1}*V_{1} }{T_{1}} = \frac{ p_{2}*V_{2} }{T_{2}}$

We are given:
p1=92.1kPa = 92100Pa
V1=200mL = 0.2L
T1=275K
p2= 101325Pa
T2=273K
V2=?

We start by rearranging formula for V2. After that we can insert numbers:
${ p_{1}*V_{1} *T_{2}} = { p_{2}*V_{2}*T_{1} } \\ \\ V_{2}= \frac{p_{1}*V_{1} *T_{2}}{ p_{2}*T_{1}} \\ \\ V_{2}= \frac{92100*0.2*273}{101325*275} \\ \\ V_{2}= 0.18L=180mL$

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3 years ago

Is the hand grip test an example of an isometric or an isotonic muscle contraction? Explain your reasoning.

shusha [124]

Hand grip test an example of an isometric muscle contraction.

Isometric(increased pressure but no shortening)

Explanation:

Isometric contraction, is one in which the muscle is activated, but instead of being allowed to lengthen or shorten, it is held at a constant length.
An isometric exercise is a form of exercise involving the static contraction of a muscle without any visible movement in the angle of the joint.
Isometric exercises are contractions of a particular muscle or group of muscles. During isometric exercises, the muscle doesn't noticeably change length and the affected joint doesn't move. Isometric exercises help maintain strength. They can also build strength, but not effectively.
Isometric exercise is also known as static strength training. (Examples include the plank and side bridge as well as the wall sit and many yoga poses such as chair and tree poses).

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SCORPION-xisa [38]

The correct answer is false cause how can u fit your finger in a wall something it's to small

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