3 years ago

Most of earth's atmosphere is composed of

Physics

1 answer:

zmey [24]3 years ago

3 0

The answer is nitrogen.

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3. A sprinter leaves the starting blocks with an acceleration of 4.5 m/s2. What is the

UkoKoshka [18]

Hi there! :)

$\large\boxed{v_{f} = 18 m/s}$

Use the following kinematic equation to solve for the final velocity:

$v_{f} = v_{i} + at$

In this instance, the runner started from rest, so the initial velocity is 0 m/s. We can rewrite the equation as:

$v_{f} = at$

Plug in the given acceleration and time:

$v_{f} = 4.5 * 4 = 18 m/s$

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2 years ago

Trumpeter A holds a B-flat note on the trumpet for a long time. Person C is running towards the trumpeter at a constant velocity

denpristay [2]

Answer:

Person B

Explanation:

Person B will hear the frequency that is lower than the B- flat.

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2 years ago

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A boat is traveling at 80 km/hr. How many hours will it take for the boat to cover a distance of 115 km?

miskamm [114]

Answer:

Explanation:

Givens

d = 115 km

r = 80 km/hr

t = ?

Equation

d = r*T

Solution

115 = 80 * t Divide by 80

115/80 = t

t = 1.4375 hours.

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2 years ago

A bullet leaves a rifle with a muzzle velocity of 521 m/s. while accelerating through the barrel of the rifle, the bullet moves

iVinArrow [24]

$velocity=\frac{distance}{time}\\\\
velocity*time=distance\\\\
time=\frac{distance}{velocity}\\\\
time=\frac{0,840m}{521\frac{m}{s}}=0,0016s\\\\
acceleration=\frac{velocity}{time}=\frac{521}{0,0016}=325625\frac{m}{s^2}$

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2 years ago

Mary slides down a snow-covered hill on a large piece of cardboard and then slides across a frozen pond at a constant velocity o

Sophie [7]

Explanation is in the file

tinyurl.com/wtjfavyw

8 0

2 years ago