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mezya [45]
3 years ago
13

Sal is experimenting with materials that dissolve in water. He finds a material that dissolves well in water. Which of these cou

ld it
be?
Physics
1 answer:
sleet_krkn [62]3 years ago
4 0

any pics? so i can see the question ⁉️

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A 73-kg Norwegian olympian ski champion is going down a hill sloped at 39 ◦ . The coefficient of kinetic friction between the sk
bazaltina [42]

Answer:

Explanation:

net force on the skier = mg sin 39 - μ mg cos39

mg ( sin39 - μ cos39 )

= 73 x 9.8 ( .629 - .116)

= 367 N

impulse = net force x time = change in momentum .

= 367 x 5 = 1835 kg m /s

velocity of the skier after 5 s = 1835 / 73

= 25.13 m /s

b )

net force becomes zero

mg ( sin39 - μ cos39 ) = 0

μ = tan39

= .81

c )

net force becomes zero , so he will continue to go ahead with constant speed of 25.13 m /s

so he will have speed of 25.13 m /s after 5 s .

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3 years ago
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Answer:

One is for hair, paper and other things, the other is for nails.

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According to Newton's third law, which describes what happens when a 4.5 kg pumpkin is launched from a catapult with a force of
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3. Law: Every action has a reaction equal in magnitude and opposite in direction.
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If the western component of the wind is half of the south, what is the angle of the wind with the south?
den301095 [7]

Answer:

This above a triangle that models our situation.

Explanation:

We have a two componens., since we have a western componet and southern component. One travel in a southern direction. and the other travel in the west.

Let the component that travel in the south be the length of a.

According to the problem, the westard component is half of that so let that length be a/2.

Now we must find the angle of the wind in the South.

This means that what is angle that is opposite of the western componet because that angle is the most southward angle. So know we apply the tan property.

\tan(x)  =  \frac{opp}{adj}

Our side opposite of the angle we trying to find is the western component and the side adjacent to it is the southern component. Also remeber since western and Southern negative displacements, we have

\tan(x)  =  \frac{ -  \frac{a}{2} }{ - a}

\tan(x)  =  -  \frac{a}{2}  \times  -  \frac{1}{a}  =  \frac{1}{2}

Now we take the arctan or inverse tan of 1/2.

\tan {}^{ - 1} ( \frac{1}{2} )  = 26.57

3 0
2 years ago
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If a person walks 3 blocks East, turns and walks 5 blocks north. The person then turns and walks 3 blocks west and then 5 blocks
torisob [31]
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