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3 years ago

Help please whats an example of kinetic energy

Physics

2 answers:

miss Akunina [59]3 years ago

8 0

Answer:

An airplane has a large amount of kinetic energy in flight due to its large mass and fast velocity.

Explanation:

Otrada [13]3 years ago

6 0

Answer:

A semi-truck travelling down the road has more kinetic energy than a car travelling at the same speed because the truck's mass is much more than the car's. A river flowing at a certain speed comprises kinetic energy as water has certain velocity and mass.

Explanation:

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A potter spins his wheel at 0.98 rev/s. The wheel has a mass of 4.2 kg and a radius of 0.35 m. He drops a chunk of clay of 2.9 k

Bad White [126]

Answer:

$v_{f,w} = 1.791\,\frac{m}{s}$ , $v_{f,c} = 0.972\,\frac{m}{s}$

Explanation:

The situation can be modelled by applying the Principle of Angular Momentum Conservation:

$I_{w} \cdot \omega_{o} = (I_{w} + I_{c})\cdot \omega_{f}$

The final angular speed is:

$\omega_{f} = \frac{I_{w}}{I_{w}+I_{c}}\cdot \omega_{o}$

$\omega_{f} = \left(\frac{\frac{1}{2}\cdot (4.2\,kg)\cdot (0.35\,m)^{2} }{\frac{1}{2}\cdot (4.2\,kg)\cdot (0.35\,m)^{2} + \frac{1}{2}\cdot (2.9\,kg)\cdot (0.19\,m)^{2}}\right)\cdot (0.98\,\frac{rev}{s} )\cdot \left(\frac{2\pi\,rad}{1\,rev} \right)$

$\omega_{f} \approx 5.116\,\frac{rad}{s}$

The tangential velocities of the wheel and the clay are, respectively:

$v_{f, w} = (0.35\,m)\cdot (5.116\,\frac{rad}{s} )$

$v_{f,w} = 1.791\,\frac{m}{s}$

$v_{f, c} = (0.19\,m) \cdot (5.116\,\frac{rad}{s} )$

$v_{f,c} = 0.972\,\frac{m}{s}$

5 0

3 years ago

A raft of mass 199 kg carries two swimmers of mass 52 kg and 70 kg. The raft is initially floating at rest. The two swimmers sim

Minchanka [31]

To solve this problem we will apply the concept related to the conservation of the Momentum. We will then start considering that the amount of initial momentum must be equal to the amount of final momentum. Considering that all the objects at the initial moment have the same initial velocity (Zero, since they start from rest) the final moment will be equivalent to the multiplication of the mass of each object by the velocity of each object, so

Initial Momentum = Final Momentum

$(m_B+m_1+m_2)v_i = m_1v_1+m_2v_2+m_Bv_B$

Here,

$m_B$ = mass of Raft

$m_1$ = Mass of swimmers 1

$m_2$ = Mass of swimmers 2

$v_i$ = Initial velocity (of the three objects)

$v_B$ = Velocity of Raft

Replacing,

$(199+52+70)*0 = (52)(4)+(70)(-4)+199v_B$

Solving for $v_B$

$vB = \frac{72}{199}$

$v_B = 0.3618m/s$

Therefore the velocity the rarft start to move is 0.3618m/s

5 0

4 years ago

If hydrogen and helium are the most abundant elements in the unoverse , then why are living organisms composed primarily of carb

Mumz [18]

Answer:

Most of materia isnt life.

Explanation:

The living organisms (life) aren't the most abundant thing in universe.

Hydrogen and helium are present in everywhere, but life isn't.

There is no reason to think because we have a lot of a thing, the life must be made for this thing.

The organic life just can exists because some mysterious properties about carbon, that is the basic foundation of life, carbon is a special element, why? We don't know, actually, it's a huge problem for science discover why the carbon can makes life be possible and other elements can't. But we know is this element that makes life possible.

So, note there isn't relation about the quantity of a material in Universe and the life constituition. In addition, look around, organic materials are very rare in Universe, Earth is one in lots of places and in most of this places there isn't sign of life.

Even in Earth the life looks abundant, in Universe it isn't, the same way in Universe the Hydrogen and Helium are abudant, in Earth isn't soo.

3 0

3 years ago

A 50kg box is pulled on by a rope. The rope applies a horizontal force of 180 N to the box. What is the normal force exerted on

Over [174]

The normal force would be the opposing and equal force to gravity ... that is why the box isn't floating or going through the ground ... this is Newton's third law of motion

4 0

4 years ago

A whistle produces sound of frequency of 1.00 kHz. If a listener moves with a speed of 30 m/s away from the whistle, what freque

Serggg [28]

Answer:

The frequency the listener hears is 911.765 Hz.

Explanation:

The speed of a sound is 340 m/s

The speed of listener is 30 m/s in a direction away from the whistle.

The speed of the listener with respect to the sound waves from the whistle

= ( 340 - 30) m/s

= 310 m/s

This because the direction of the sound waves from the whistle and the direction of travel of the listener are the same, that is, both are traveling away from the whistle.

Therefore from the formula we get

⇒ $\frac{f_2}{f_1} = \frac{v_2}{v_1}$ ⇒ $f_2$ = $1000 \times \frac{310}{340} = 911.765 \hspace{0.1cm} Hz$

The frequency the listener hears is 911.765 Hz.

8 0

3 years ago