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3 years ago

3. An object thrown vertically upwards reached a maximum height of 5.0 m. Calculate:

Physics

1 answer:

mr Goodwill [35]3 years ago

7 0

Answer:

Correct answer: V₀ = 9.9 m/s

Explanation:

The subject is a vertical upward shot.

We will use the following formula:

V₀² = 2 · g · h => V₀ = √2 · g · h , where V₀ is initial velocity

V₀ = √2 · 9.81 · 5 = √ 10 · 9.81 = √98.1 = 9.9 m/s

V₀ = 9.9 m/s

God is with you!!!

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You blow across the open mouth of an empty test tube and producethe fundamental standing wave of the air column inside the testt

sertanlavr [38]

Answer:

(a). The frequency of this standing wave is 0.782 kHz.

(b). The frequency of the fundamental standing wave in the air is 1.563 kHz.

Explanation:

Given that,

Length of tube = 11.0 cm

(a). We need to calculate the frequency of this standing wave

Using formula of fundamental frequency

$f_{1}=\dfrac{v}{4l}$

Put the value into the formula

$f_{1}=\dfrac{344}{4\times0.11}$

$f_{1}=781.81\ Hz$

$f_{1}=0.782\ kHz$

(b). If the test tube is half filled with water

When the tube is half filled the effective length of the tube is halved

We need to calculate the frequency

Using formula of fundamental frequency of the fundamental standing wave in the air

$f_{1}=\dfrac{v}{4(\dfrac{L}{2})}$

Put the value into the formula

$f_{1}=\dfrac{344}{4\times\dfrac{0.11}{2}}$

$f_{1}=1563.63\ Hz$

$f_{1}=1.563\ kHz$

Hence, (a). The frequency of this standing wave is 0.782 kHz.

(b). The frequency of the fundamental standing wave in the air is 1.563 kHz.

6 0

4 years ago

When you used the energy in our body to pull the rubber band, it was transformed into elastic potential energy. We know that ene

GuDViN [60]

Answer:

Converted to heat energy

Explanation:

Some of the elastic potential energy is transformed into heat energy. When we stretch a rubber band, it is often observed that the rubber becomes warmer after the stretch and even during the stretch.

Some energy in the band initially at rest will be converted into elastic potential energy and heat energy as it is stretched .

The heat energy is not usually accounted for since the major concern most times is the elastic energy.
In this process, heat energy becomes a waste energy.
By deducing the efficiency, we would find that this transformation is not efficient as predicted by one of the laws of thermodynamics.

3 0

4 years ago

Which best describes his run?

Troyanec [42]

Can you send a picture of the question or graph? There isn’t enough information here to answer

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3 years ago

Read 2 more answers

If several forces are exerted on a system, calculate the work done by each force, then multiply the results.

maria [59]

Answer:

false, each force might have a different about and a different direction