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3 years ago

A wave and a pendulum are both oscillators. why isn't a pendulum a wave? Please help ..

1 answer:

4 0

-- A wave travels from place to place.
   A pendulum just sits there.

-- A wave carries energy. A pendulum has energy,
   but doesn't take it anywhere.

-- A wave is a traveling pattern of maximums and minimums
   that all exist at the same time but in different places.
   A pendulum is a stationary pattern of maximums and minimums
   that all exist in the same place but at different times.
   (I made this one up just now; I really like it.)

What makes you think that all oscillators must be pendulums,
or must be waves, or must be both, anyway ?

A guitar string is an oscillator that has waves on it,
but no pendulum anywhere nearby.

A car horn is an oscillator that sends waves out
but there's no pendulum anywhere nearby.

An analog wrist watch has an oscillator in it, which is
actually a torsion pendulum, but there are no waves
anywhere nearby.
_____________________________

Going just one step further with the logic of your question ...
If the logic held water, then we would have to ask:
A horse and a dog are both animals.
So why isn't a horse a dog ?

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Scientific work is currently underway to determine whether weak oscillating magnetic fields can affect human health. For example

nlexa [21]

Answer:

The maximum emf that can be generated around the perimeter of a cell in this field is $1.5732*10^{-11}V$

Explanation:

To solve this problem it is necessary to apply the concepts on maximum electromotive force.

For definition we know that

$\epsilon_{max} = NBA\omega$

Where,

N= Number of turns of the coil

B = Magnetic field

$\omega =$ Angular velocity

A = Cross-sectional Area

Angular velocity according kinematics equations is:

$\omega = 2\pi f$

$\omega = 2\pi*61.5$

$\omega =123\pi rad/s$

Replacing at the equation our values given we have that

$\epsilon_{max} = NBA\omega$

$\epsilon_{max} = NB(\pi (\frac{d}{2})^2)\omega$

$\epsilon_{max} = (1)(1*10^{-3})(\pi (\frac{7.2*10^{-6}}{2})^2)(123\pi)$

$\epsilon_{max} = 1.5732*10^{-11}V$

Therefore the maximum emf that can be generated around the perimeter of a cell in this field is $1.5732*10^{-11}V$

6 0

4 years ago

The Sears Tower vibrates back and forth, it makes about 8.6

Leni [432]

Answer: Frequency is 0.143 Hz; Period is 7 seconds

Explanation:

Number of vibrations = 8.6

Time required = 60 seconds

Period (T) = ?

Frequency of the vibrations (F) = ?

A) Recall that frequency is the number of vibrations that the Sears tower completes in one second.

i.e Frequency = (Number of vibrations / time taken)

F = 8.6/60 = 0.143Hz

B) Period, T is inversely proportional to frequency. i.e Period = 1/Frequency

T = 1/0.143Hz

T = 7 seconds

Thus, the frequency and period of the vibrations of the Sears Tower are 0.143 Hz

and 7 seconds respectively.

7 0

4 years ago

A ball is tied to the end of a length of string. A student holds one end of the string and whirls it so the ball travels in a ve

AlexFokin [52]

Answer:

The top of the circle

Explanation:

At the top of the circle, there are two forces pulling the ball towards the center of the circle: weight and tension.

∑F = ma

mg + T = mv²/r

As v goes down, T also goes down, until it eventually reaches 0.

At the bottom of the circle, weight is pulling down, or away from the center of the circle. Sum of the forces:

∑F = ma

T − mg = mv²/r

As v goes down, T also goes down. However, even at v=0, T cannot be less than mg.

5 0

4 years ago

Will give BRAINLIEST!

tresset_1 [31]

A limestone plateau has no surface water. All the water is pulled underground through cracks and crevices in the surface. What most likely will cause the underground of the plateau to change over time?

Physical weathering due to frost wedging

Physical weathering due to abrasion

Chemical weathering due to oxygen

Chemical weathering due to water <em>Correct Answer</em>

6 0

4 years ago

Suppose you throw a ball straight upward; it rises, then returns to your hand

bazaltina [42]

Answer:

Please find the attached file for the solution

Explanation:

Given that you throw a ball straight upward; it rises, then returns to your hand

(a) Calling the point where it leaves your hand the origin and upward positive, make a plausible sketch of its position (vertical height) x(t) versus time t from the instant after it leaves your hand till the instant before it reaches it again.

(b) From your x(t) plot, make a sketch of the ball’s velocity v(t) versus time.

(d) Does your plot suggest that the ball’s acceleration is zero at the top of its flight

Please find the attached file for the solution and graph

5 0

3 years ago