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3 years ago

I MARK BRAINLIEST, PLEASE ANSWER ASAP!!! PHYSICS 20 POINTS!!

Physics

2 answers:

JulsSmile [24]3 years ago

6 0

A and c you got thissssss

irina [24]3 years ago

5 0

The first one is C. Hope this helps!! If you need anymore help just message me and I will try to get back to you quickly and help in any way i can!

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a professional athlete who takes dance or gymnastics to improve their skills in their professional sport.

scoundrel [369]

Yes, many professional athletes will take dance classes to improve their skills. Such as football players to improve their footwork and use other muscles they wouldn't use while doing just push ups.

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4 years ago

A car accelerates from 10 m/s to 22 m/s in 6 seconds. What is the car’s average acceleration?

Natasha2012 [34]

is to mutilpy to each other

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3 years ago

What causes friction between two solid forces? After the roughness of the surfaces, what most affects the frictional force exper

Sveta_85 [38]

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3 years ago

What is the initial velocity of a projectile that is launched at a 25o angle and travles 70 km in 25 seconds?

Novay_Z [31]

Answer: The initial velocity of the projectile is 3.1 km/s

Explanation:

There is a problem with the question because we do not know in which direction the projectile travels 70 km.

I will assume that the projectile travels 70 km horizontally, as is the usual case.

I will also assume that 25 seconds after the projectile is fired, it hits the ground.

Suppose that the initial velocity of the projectile is V0, and this velocity V0 can be thought as the hypotenuse of a triangle rectangle, then the x-component and the y-component of the velocity will be the catheti of this triangle rectangle, then we can write:

Vy = V0*sin(25°)

Vx = V0*cos(25°).

Now, the vertical problem does not affect the horizontal one, so we can see only the horizontal case.

Here we don't have any force, then there is no acceleration, then the velocity is constant and it is equal to:

v(t) = V0*cos(25°)

For the horizontal position we can integrate over time to get:

p(t) = V0*cos(25°)*t + p0

where p0 is the initial position, and we can assume that it is equal to zero.

Then:

p(t) = V0*cos(25°)*t

Now we know that in t = 25s, the position is 70km

(because the projectile travelled 70km in 25 seconds) then:

p(25s) = 70km = V0*cos(25°)*25s

Now we can solve this for V0.

V0 = 70km/(cos(25°)*25s) = 3.1 km/s

The initial velocity of the projectile is 3.1 km/s

The thing you can get from this is that we can analyze the vertical problem and the horizontal problem separately (for example, here we only solved the horizontal case and we ignored the vertical one).

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3 years ago

he number of hydrogen ions would equal the number of hydroxide ions in a solution with a pH of _____.

erma4kov [3.2K]

The number of hydrogen ions would equal the number of hydroxide ions in a solution with a pH of 7.

<u>Explanation :</u>

The substance’s acidic or basic nature is determined by its pH value which is the indication of the number of free hydrogen ion ( $H^{+}$ ). The pH value and the alkalinity can be measured by pH scale which varies from 0 to 14. Neutral water has the pH value of 7 with equal number of hydrogen ions ( $H^{+}$ ) and Hydroxide ions ( $O H^{-}$ ).

A substance with a pH value above than 7 is counted amongst the base whereas those with a pH value are counted amongst the acids. When a solution gets ten times more acidic, the pH value falls by the count of one.

There are various methods to determine the pH value of any substance and the most effective and quick one is the pH indicator paper. When the indicator paper is dipped in the water solution of the substance, it colour changes according to the different pH value. Another effective method to determine the pH value is the use of pH electrodes.

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4 years ago