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3 years ago

For any object in projectile motion, the vertical velocity is independent of gravity?

Physics

1 answer:

monitta3 years ago

6 0

Answer:

the y axis, every moment is subjected to a vertical acceleration directed towards the center of the Earth, which is called the acceleration of gravity

Explanation:

In projectile launching, the movement is separated into two movements, one on the x-axis and the other on the y-axis, related through time.

In horizontal movement, the speed is constant, because there is no acceleration in this axis, the effect of air friction is almost always eliminated.

In the other movement on the y axis, every moment is subjected to a vertical acceleration directed towards the center of the Earth, which is called the acceleration of gravity.

This value of the eceleration of gravity is constant for small distances

compared to the radius of the Earth, for higher altitudes an expansion in beings of the distance is used, giving a linear dependence.

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3 years ago

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A wave travelling 140 m/sec with a wavelength of 4.0 m has what frequency? _______________Meters / Hz / seconds

valentina_108 [34]

Answer:

The frequency of a wave is 35 Hz.

Explanation:

Speed of a wave is 140 m/s

Wavelength of a wave is 4 m

It is required to find the frequency. The relation between frequency, speed and the wavelength of a wave is given by :

$v=f\lambda$

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3 years ago

How far does a car go in 10 seconds at the speed of 44m/s

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3 years ago

A car starts from rest at the top of a hill with 45 J of gravitational

kherson [118]

Answer:

The car will be moving at 5.48 m/s at the bottom of the hill

Explanation:

Principle of Conservation of Mechanical Energy

In the absence of friction, the total mechanical energy is conserved. That means that

$E_m=U+K$ is constant, being U the potential energy and K the kinetic energy

U=mgh

$\displaystyle K=\frac{mv^2}{2}$

When the car is at the top of the hill, its speed is 0, but its height h should be enough to produce the needed speed v down the hill.

The Kinetic energy is then, zero. When the car gets enough speed we assume it is achieved at ground level, so the potential energy runs out to zero but the Kinetic is at max. So the initial potential energy is transformed into kinetic energy.

We are given the initial potential energy U=45 J. It all is transformed to kinetic energy at the bottom of the hill, thus:

$\displaystyle \frac{mv^2}{2}=45$

Multiplying by 2:

$\displaystyle mv^2=90$

Dividing by m:

$\displaystyle v^2=\frac{90}{m}$

Taking square roots:

$\displaystyle v=\sqrt{\frac{90}{m}}$

$\displaystyle v=\sqrt{\frac{90}{3}}$

$v=\sqrt{30}$

v = 5.48 m/s

The car will be moving at 5.48 m/s at the bottom of the hill

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3 years ago

Give an example of how a cell’s structure relates to its function in the body.

kenny6666 [7]

Answer:

The epithelial cell shape and stratification are related to its function. For example, the skin is specialized to act as a "physical" barrier to the outside world. This barrier is both structural (multi-layered) and chemical in nature. Another example is the cells that make up the tubular elements of the kidney.

Explanation:

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3 years ago

For any object in projectile motion, the vertical velocity is independent of gravity?​

For any object in projectile motion, the vertical velocity is independent of gravity?