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galina1969 [7]
3 years ago
11

Describe how different types of motion are represented by distance-time graphs and velocity-time graphs.

Physics
1 answer:
eduard3 years ago
4 0

Answer:

non-accelerated movement

velocity versus time  a horizontal straight line.

distance versus time  gives a horizontal straight line.

accelerated motion

graph of velocity versus time s an inclined line and the slope

graph of distance versus time is a parabola of the form

Explanation:

In kinematics there are two types of steely and non-accelerated movements

In a  the velocity of the body is constant therefore a speed hook against time gives a horizontal straight line.

A graph of distance versus time is a straight line whose slope is the velocity of the body

          x = v t

In an accelerated motion the velocity changes linearly with time, so a graph of velocity versus time is an inclined line and the slope is the value of the acceleration of the body

         v = v₀ + a t

A graph of distance versus time is a parabola of the form

         x =v₀ t + ½ a t²

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A beach ball with a volume of 5,000 cm3 is pushed underwater. What is the magnitude of the buoyant force pushing upwards? The de
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<h2>Hello!</h2>

The answer is:

The buoyant force is equal to 49N.

<h2>Why?</h2>

The buoyant force is the force that pushes upwards and object when it's submerged in water, this force is always trying to move the object to the surface of the liquid or water.  We must consider that the volume of water or liquid displaced is equal to the volume of the submerged object.

We can calculate the buoyant force using the following formula:

F_{B}=Density*VolumeDisplaced*GravityAcceleration

Where,

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Gravity acceleration is the acceleration due to gravity.

So, from the statement we know that:

VolumeDisplaced=BeachBallVolume=5000cm^{3}\\\\Density=1\frac{gram}{cm^{3} }=\frac{0.001kg}{cm^{3} }\\\\g=9.8\frac{m}{s^{2} }

Now, substituting and calculating we have:

F_{B}=Density*VolumeDisplaced*GravityAcceleration

F_{B}=0.001\frac{kg}{cm^{3}*} *5000cm^{3}*9.8\frac{m}{s^{2} }

F_{B}=0.001\frac{kg}{cm^{3}*} *5000cm^{3}*9.8\frac{m}{s^{2} }

F_{B}=49\frac{Kg.m}{s^{2}}=49N

Hence, we have that the correct answer is:

The buoyant force is equal to 49N.

Have a nice day!

7 0
4 years ago
Two electric motors drive two elevators of equal mass in a three-story building 10 meters tall. Each elevator has a mass of 1,00
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Answer:

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Since the force is a product of mass and acceleration: F = m · a

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We have:

P = ?

m = 1000 kg

a = 9.81 m/s²  (gravitational acceleration on the Earth)

h = 10 m

t = 5s

P = m · a · h / t = 1000 kg  · 9.81 m/s²  · 10 m / 5 s = 19620 Watt = 19.62 kWatt

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frequency of engine is given here

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