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3 years ago

The diagram shows a swinging pendulum.

Physics

2 answers:

pashok25 [27]3 years ago

8 0

Answer:

A. The mechanical energy transforms to thermal energy as the pendulum slows and eventually stops moving.

Explanation:

took the quiz on edge

suter [353]3 years ago

5 0

Answer:

<h2>A. The mechanical energy transforms to thermal energy as the pendulum slows and eventually stops moving.</h2>

Explanation:

The law of conservation of energy states that the amount of energy is a constant, that is, it cannot be created or destroyed, it just can be transformed into different forms.

For example, in real life, a pendulum will stop moving eventually. But, why is the pendulum going to stop? Because, there's friction in that motion, which means that the energy that's being used, it's transforming into heat by friction. In terms of energy, that heat represents a subtractor of the movement.

So, the mechanical energy, which is kinetic and potenial, it's transforming to "thermal energy", making the pendulum to slow down, until stops.

Now, in a perfect environment (which doesn't exist), the pendulum would never stop, and there weren'n any heat, because there wouldn't be friction. But that's not the case here.

Therefore, the best answer is A.

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A truck pulls a block 8 meters across a level surface at a force of 216 N over the course of 12 seconds. How much power did the

iren [92.7K]

Answer:

work = 1728

Power = 134

Explaination:

by using the formula,

Work(W)= Force(F)×Distance(D)

Power(P)= Work(W)/Time taken(T)

4 0

3 years ago

The speed of sound in air is 345 m/s. A tuning fork vibrates above the open end of a sound resonance tube. If sound waves have w

Delvig [45]

To develop this problem it is necessary to apply the concept of Frequency based on speed and wavelength.

According to the definition the frequency can be expressed as

$f = \frac{v}{\lambda}$

Where,

v = Velocity

$\lambda =$ Wavelength

Our value are given by,

v = 345m/s

$\lambda = 63cm$

Replacing

$f = \frac{345}{0.63}$

$f = 547.61Hz$

Therefore the frequency of the tuning fork is 547.61Hz

6 0

3 years ago

D=1/2at^2 <br> solve for a

nignag [31]

Answer:

a = 2d / t²

Explanation:

d = ½ at²

Multiply both sides by 2:

2d = at²

Divide both sides by t²:

a = 2d / t²

4 0

3 years ago

As the temperature of water drops, it continues to give off thermal energy until it freezes. This is an example of.

jeka57 [31]

Answer:

The answer should be C

Explanation:

An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.

Please tell me if it is wrong

<em>I would appreciate a brainliest </em>

Have a great day!

7 0

2 years ago

Read 2 more answers

A helicopter has blades of length 4.0 m rotating at 3.0 rev/s in a horizontal plane.If the vertical component of the Earth’s mag

VARVARA [1.3K]

Answer:

Induced emf, $\epsilon=9.79\times 10^7\ volts$

Explanation:

Given that,

Length of the helicopter, l = 4 m

Angular speed of the helicopter, $\omega=3\ rev/s=18.84\ rad/s$

The vertical component of the Earth’s magnetic field is, $B=6.5\times 10^5\ T$

We need to find the induced emf between the tip of a blade and the hub. The induced emf in terms of angular velocity of an rotating object is given by :

$\epsilon=\dfrac{1}{2}B\omega l^2$

$\epsilon=\dfrac{1}{2}\times 6.5\times 10^5\times 18.84\times (4)^2$

$\epsilon=9.79\times 10^7\ volts$

So, the induced emf between the tip of a blade and the hub is $\epsilon=9.79\times 10^7\ volts$ . Hence, this is the required solution.

5 0

3 years ago