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3 years ago

Choose the correct energy transformation for a rock falling from a cliff.

Physics

1 answer:

Natasha_Volkova [10]3 years ago

7 0

Well if that rock is sitting on a cliff, then it falls.

It is Potential energy --> to Kinetic energy

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A 80 kg skier grips a moving rope that is powered by an engine and is pulled at constant speed to the top of a 25 degrees hill.

zloy xaker [14]

Answer:

$P=28.085\,hp$

Explanation:

Given that:

mass of 1 skier, $m=80kg$

inclination of hill, $\theta=25^{\circ}$

length of inclined slope, $l=220m$

time taken to reach the top of hill, $t=2.3 min= 138 s$

coefficient of friction, $\mu=0.15$

Now, force normal to the inclined plane:

$F_N=m.g.cos\theta$

$F_N=80\times 9.8\times cos25^{\circ}$

$F_N=710.54\,N$

Frictional force:

$f=\mu.F_N$

$f=0.15\times 710.54$

$f=106.58\,N$

The component of weight along the inclined plane:

$W_l=m.g.sin\theta$

$W_l=80\times 9.8\times sin25^{\circ}$

$W_l=331.33\,N$

Now the total force required along the inclination to move at the top of hill:

$F=f+W_l$

$F=106.58+331.33$

$F=437.91\,N$

Hence the work done:

$W=F.l$

$W=437.91\times 220$

$W=96340.80\,J$

Now power:

$P=\frac{W}{t}$

$P=\frac{96340.80}{138}$

$P=698.12\,W$

So, power required for 30 such bodies:

$P=30\times 698.12$

$P=20943.65\,W$

$P=\frac{20943.65}{745.7}$

$P=28.085\,hp$

8 0

3 years ago

Which perspective believes that behavior is learned through rewards and punishments

SCORPION-xisa [38]

Behaviorism is the aspect of psychology that believes that behavior is learned through rewards and consequences. There have been many scientific studies conducted on this idea.

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3 years ago

What must be applied to move a load?

Misha Larkins [42]

An applied force must be applied to move a load. This applied force must be large enough to overcome any opposing forces in order to move the load.

3 0

4 years ago

Read 2 more answers

Plz help me on science about cells

tatuchka [14]

Cell theory states that all living things are made of cells. And cells can only come from other cells, this disproves spontaneous generation and therefore proves the view that organisms can grow from food or dirt is wrong.

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3 years ago

The mass of a basketball is three times greater then the mass of a softball. Compare the momentum’s of a softball and a basketba

vagabundo [1.1K]

Let m = the mass of the softball.
Then the mass of the basketball is 3m.

By definition, momentum = mass * velocity.
If both the softball and basketball move at the same velocity, v, then
Momentum of the softball = mv
Momentum of the basketball = 3mv

Answer: The momentum of the basketball is 3 times that of the softball.

5 0

4 years ago