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Tema [17]
3 years ago
12

Objects accelerate because

Physics
1 answer:
erica [24]3 years ago
3 0
Friction I think soooooooooo
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Soil profile includes all the sections/ horizons of the vertical soil depth from top to bottom including the transitions from one horizon to another. A soil horizon is a distinct layer/section of soil with more or less the same texture. Therefore, a soil profile is made of soil horizons.  

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Mechanical energy is a term that is used to describe
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The sum of potential energy<span> and kinetic </span><span>energy.
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7 0
3 years ago
A compact car has a maximum acceleration of 2.0 m/s2 when it carries only the driver and has a total mass of 1100 kg . you may w
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According to Newton`s  law. Force exerted by car,

F = m a = 1100 kg \times 2 m/s^2 = 2200 \ N

After adding an additional 400 kg of mass, the force will be same therefore the acceleration

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4 0
3 years ago
A pendulum has 201 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom o
malfutka [58]
<h2>Hello!</h2>

The answer is: 201 J of kinetic energy.

<h2>Why?</h2>

The motion of a pendulum (with no friction considered) is a continuous exchange between potential energy and kinetic energy.

So, at the highest point of its swing, the potential energy will be the maximum potential energy that the pendulum can have and the kinetic energy will be 0 since at max height the speed tends to 0.

On the opposite side, when the pendulum is at the bottom (the lowest point of its swing) the potential energy will be the minimum (tends to 0) but the kinetic energy will be the maximum.

Also, in the pendulum motion, the total energy is conserved, meaning that:

PE_{h} +KE_{h}=PE_{l} +KE_{l}\\PE=mgh\\KE=\frac{1mv^{2} }{2}

Where,

PE(h),is the potential energy at the highest point.

KE(h), is the kinetic energy at the highest point.

PE(l), is the potential energy at the lowest point (bottom of pendulum swing).

KE(l), is the kinetic energy at the lowest point (bottom of pendulum swing).

m, is the mass of the object.

g, is the acceleration of gravity.

v, is the speed of the object.

So, what is the energy at the bottom of its swing?

201J +0=0 +201J\\201J=201J

So, the pendulum has 201 of kinetic energy at the bottom of its swing.

Meaning that the energy is conserved.

Have a nice day!

7 0
3 years ago
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