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3 years ago

How can Magnets cause objects to have kinetic energy?

Physics

2 answers:

Aleks04 [339]3 years ago

8 0

Answer:

Hi !!!!!!!!!

Here u go

100% confirm answer

If there is a system of magnets being held in place, there is potential energy. When you let go, the potential energy converts to kinetic energy and the magnets move. ... Putting the system of magnets close together which creates an opposing force.

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lianna [129]3 years ago

4 0

Answer:

If there is a system of magnets being held in place, there is potential energy. When you let go, the potential energy converts to kinetic energy and the magnets move. Putting the system of magnets close together which creates an opposing force.

Explanation:

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A sports car engine delivers 150 kW to the driveshaft with a thermal efficiency of 20%. The fuel has a heating value of 35 000 k

Andreyy89

Answer:600 kW

Explanation:

Given

Power delivered $P=150 kW$

Fuel heating value $q=35,000 kJ/kg$

thermal Efficiency $\eta =\frac{Power}{Heat}$

$0.2=\frac{150}{35,000\times \dot{m}}$

where, $\dot{m} =mass\ flow\ rate\ of\ fuel$

$\dot{m}=\frac{150}{35,000\times 0.2}$

$\dot{m}=0.0214 kg/s$

For an Engine

$q\dot{m}=P+Q_r , where Q_r=heat\ rejected$

$Q_r=q\dot{m}-P$

$Q_r=750-150=600 kW$

3 0

3 years ago

Rest and Motion are the relative term. why? explain with example(please help me (╥﹏╥))

klemol [59]

Explanation:

it depens on the subject and object. Let's example

you are driving a tesla car with your dog sitting on your side. You will say that the dog is at REST

but your friend, standing in sidewalk, seeing the same dog, will say that your dog is moving because it has MOTION from your car

3 0

3 years ago

A tuning fork of frequency 254 Hz and an open orang pipe of slightly lower frequency are at 15oC. When

katovenus [111]

The temperature of the air in the open orang pipe has been altered by 18.73° C

The frequency of an open orang pipe is estimated by using the formula:

$\mathbf{f = \dfrac{v}{2L}}$

Then, the combination of the frequency of the tuning fork and the open orang pipe is:

$\mathbf{254 - \dfrac{v}{2L} }$

These combinations of frequency produce 4 beats per sound.

i.e.

$\mathbf{254 - \dfrac{v}{2L} =4}$

$\mathbf{ \dfrac{v}{2L} = 254-4 }$

$\mathbf{ \dfrac{v}{2L} = 250 ----(1)}$

When it is altered, the beats first diminish and increase again by 4.

i.e.

$\mathbf{ \dfrac{v'}{2L} = 254+4 }$

$\mathbf{ \dfrac{v'}{2L} = 258 --- (2) }$

If we equate both equations (1) and (2) together, we have:

$\mathbf{\dfrac{v'}{v}= \dfrac{258}{250}}$

However, from our previous knowledge, we understand that the velocity of an object varies directly proportional to the square root of its temperature.

Hence;