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notka56 [123]
3 years ago
5

A rope is vibrated so that transverse waves propagate down it. if the distance between crests is 0.5 m and a new crest reaches t

he end every 0.4 seconds. what is the propagation speed of the wave?
Physics
1 answer:
xxMikexx [17]3 years ago
7 0
<span>The speed of a wave, V, is f *lambda. Where f is the frequency and lambda is the distance. If a new crest reaches the end every 4 secs; it takes 8s to cover the distance. Hence, f, which is the number of oscillations covered is 8s. So we have V = 8 * 5 = 40 ms^1.</span>
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If a force always acts perpendicular to an object's direction of motion, that force cannot change the object's kinetic energy. It is a true statement .

Kinetic energy is the energy that an object possesses due to its motion. It is basically the energy of mass in motion. Kinetic energy can never be negative and it is a scalar quantity i.e. it provides only the magnitude and not the direction.

According to law of conservation of mechanical energy change in potential energy is equal and opposite to the change in the kinetic energy.

According to the principle of conservation of mechanical energy, The total mechanical energy of a system is conserved i.e., the energy can neither be created nor be destroyed; it can only be internally converted from one form to another if the forces doing work on the system are conservative in nature.

since, potential energy is stored in the form of work done

Work done = Fs cos (theta)

If force always acts perpendicular to an object's direction of motion

theta =   90 °

cos (90 ) = 0

Work done  = 0

since , there is no work done , hence kinetic energy will not change

To learn more about  kinetic energy here

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A small truck has gone over an embankment. The driver has a head injury and is​ confused, but is able to tell you that he is hau
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The Coulomb force between two charges q1 and q2 at separation r in the air is 10N. If half of the separation is filled with medi
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Explanation:

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The Coulomb's force between two charges separated by a distance r in a medium with dielectric constant is given as

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