3 years ago

Why does a vibrating simple pendulum not to produce any sound

1 answer:

7 0

It does produce 'sound' ... a compression wave traveling through the air. But your ears don't hear a sound that's vibrating less than 20 or 30 times every second. If you could swing your pendulum that fast, you could hear the sound of its vibrations pushing the air around.

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A rope pulls a 20 kg box up. If the tension in the rope is 275 N, what is the acceleration of the box?

Nana76 [90]

Answer:

<h3>The answer is 13.75 m/s²</h3>

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

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

f is the force

m is the mass

From the question we have

$a = \frac{275}{20} = \frac{55}{4} \\$

We have the final answer as

Hope this helps you

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3 years ago

A voltmeter reads 200 V between parallel plates that are 2 cm apart. what is the strength of the electric field between the two

Misha Larkins [42]

I think that is c) l’m not sure

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3 years ago

Which type of graph uses wedges to show the amount of data points in a category?

Umnica [9.8K]

A pie chart uses wedges to show the amount of data points in a category.

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4 years ago

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Penny puts Fluffy in one wagon and pushes the wagon, once, as hard as she can. Penny puts Butch in the other wagon and pushes it

loris [4]

D; the wagons will both move in the same way

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4 years ago

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Two electric motors drive two elevators of equal mass in a three-story building 10 meters tall. Each elevator has a mass of 1,00

Lady bird [3.3K]

Answer:

19620 Watt = 19.62 kWatt

Explanation:

Power output (P) is work (W) divided by time (t): P = W/t

A work (W) is a product of a force (F) and a distance (d): W = F · d

Since the force is a product of mass and acceleration: F = m · a

then work would be: W = m · a · h

P = W/t

W = m · a · h

P = m · a · h / t

We have:

P = ?

m = 1000 kg

a = 9.81 m/s² (gravitational acceleration on the Earth)

h = 10 m

t = 5s

P = m · a · h / t = 1000 kg · 9.81 m/s² · 10 m / 5 s = 19620 Watt = 19.62 kWatt

8 0

3 years ago