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3 years ago

A wave with a wavelength of 15 m travels at 330 m/s. Calculate its frequency.

Physics

1 answer:

Lera25 [3.4K]3 years ago

7 0

${ \boxed {\red {\boxed {\green {\boxed {\blue {\boxed{ \bold{frequency = \frac{velocity(v)}{wavelength(λ)} }}}}}}}}}$

$\mathsf{frequency = \frac{330ms {}^{ - 1} }{15m} }$

$\purple{ \sf{frequency \: = \: 22m {}^{ - 2} } {s}^{ - 1} }$

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An elevator of mass M is at rest when its cable breaks. The elevator falls a distance h before it encounters a massless, cushion

brilliants [131]

Answer: $v=\sqrt{\dfrac{2[mgh+fh]}{m}}$

Explanation:

$\text{Given}$

cable breaks and elevator falls a distance h

Friction force f is applied by the clamps

Before it hits the spring velocity of elevator is given by the work energy theorem i.e. work done by all the forces is equal to change in kinetic energy

$W_g+W_f=\text{change in kinetic energy}$

Where ,

$W_g=\text{Work done by gravity}$

$W_f=\text{Work done by friction}$

$mgh+f\cdot h=\frac{1}{2}mv^2$

$v=\sqrt{\dfrac{2[mgh+fh]}{m}}$

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3 years ago

At its lowest setting a centrifuge rotates with an angular speed of ω1 = 250 rad/s. When it is switched to the next higher setti

dalvyx [7]

Answer:

Part(a): The angular acceleration is $5.63~rad~s^{-2}$ .

Part(b): The angular displacement is $2629~rad$ .

Explanation:

Part(a):

If $\omega_{1},~\omega_{2}~and~\alpha$ be the initial angular speed, final angular speed and angular acceleration of the centrifuge respectively, then from rotational kinematic equation, we can write

$\alpha = \dfrac{\omega_{2} - \omega_{1}}{t}......................................................(I)$

where ' $t$ ' is the time taken by the centrifuge to increase its angular speed.

Given, $\omega_{i} = 250~rad~s^{-1}$ , $\omega_{f} = 750~rad~s^{-1}$ and $t = 9.5~s$ . From equation ( $I$ ), the angular acceleration is given by

$\alpha = \dfrac{750 - 250}{9.5}~rad~s^{-2} = 5.63~rad~s^{-2}$

Part(b):

Also the angular displacement ( $\Delta \theta$ ) can be written as

$&&\Delta \theta = \omega_{1}~t + \dfrac{1}{2}\alpha~t^{2}\\&or,& \Delta \theta = (250 \times 9.5 + \dfrac{1}{2} \times 5.63 \times 9.5^{2})~rad = 2629~rad$

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3 years ago

A net force of 15 N is exerted on an encyclopedia to cause it to accelerate at a rate of 5 m/s2. Determine the mass of the encyc

lina2011 [118]

Answer:

Explanation:

The mass of the encyclopedia can be found by using the formula

$m = \frac{f}{a} \\$

f is the force

a is the acceleration

From the question we have

$m = \frac{15}{5} \\$

We have the final answer as

Hope this helps you

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2 years ago

Resistance in wires causes which of the following to occur?

Natasha_Volkova [10]

Resistance in wires causes thermal energy. The correct answer between all the choices given is the third choice or letter C. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

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3 years ago

Read 2 more answers

Five difference between elastic collision and inelastic collision?

olga_2 [115]

Answer:

Elastic Collision

Inelastic Collision

The total kinetic energy is conserved. The total kinetic energy of the bodies at the beginning and the end of the collision is different.

Momentum does not change. Momentum changes.

No conversion of energy takes place. Kinetic energy is changed into other energy such as sound or heat energy.

Highly unlikely in the real world as there is almost always a change in energy. This is the normal form of collision in the real world.

An example of this can be swinging balls or a spacecraft flying near a planet but not getting affected by its gravity in the end.

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2 years ago