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vredina [299]
3 years ago
7

The energy transfer diagram represents the energy of a person diving into a pool.

Physics
2 answers:
SIZIF [17.4K]3 years ago
6 0

Answer:

A) 1000 J

Explanation:

Andreyy893 years ago
5 0
The correct answer is: 
<span>A) 1000 J

In fact, energy cannot be destroyed nor created: this means that the total energy of the person must remain constant.

The initial energy of the person is U=8000 J, in form of gravitational potential energy. When he jumps and dives into the pool, this energy is converted into kinetic energy (K, 7000 J) and partially into thermal energy, Et. The final energy of the person, sum of kinetic energy and thermal energy, must be equal to the initial energy:
</span>U=K+E_t
<span>from which we can find the thermal energy:
</span>E_t = U-K=8000 J - 7000 J = 1000 J<span>
</span>
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Levart [38]
9414/18 is equal to 523
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3 years ago
What are the advantages and disadvantages for methods used to reduce the impact of human activity?
Helga [31]

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5 0
3 years ago
The inductance in the drawing has a value of L = 9.4 mH. What is the resonant frequency f0 of this circuit?
yuradex [85]

Answer:

The resonant frequency of this circuit is 1190.91 Hz.

Explanation:

Given that,

Inductance, L=9.4\ mH=9.4\times 10^{-3}\ H

Resistance, R = 150 ohms

Capacitance, C=1.9\ \mu F=1.9\times 10^{-6}\ C

At resonance, the capacitive reactance is equal to the inductive reactance such that,

X_C=X_L    

2\pi f_o L=\dfrac{1}{2\pi f_oC}

f is the resonant frequency of this circuit  

f_o=\dfrac{1}{2\pi \sqrt{LC}}

f_o=\dfrac{1}{2\pi \sqrt{9.4\times 10^{-3}\times 1.9\times 10^{-6}}}

f_o=1190.91\ Hz

So, the resonant frequency of this circuit is 1190.91 Hz. Hence, this is the required solution.

4 0
3 years ago
A Bullet Off mass 100 gm is fired From A Gun Off mass 5 Kg. If the backward velocity of the gun's 5 m / s, what is forward veloc
Elena L [17]

Answer:

250 m/s

Explanation:

The mass of the bullet, m₁ = 100 g = 0.1 kg

The mass of the gun, m₂ = 5 kg

The backward velocity of the gun, v₂ = -5 m/s

Given that the momentum is conserved, we have;

The total initial momentum = The total final momentum

The gun and the bullet are at rest, therefore, we have;

The initial momentum = 0

The total final momentum = m₁·v₁ + m₂·v₂

Where;

v₁ = The forward velocity of the bullet

Therefore, we get;

m₁·v₁ + m₂·v₂ = 0

0.1 kg × v₁ + 5 kg × (-5 m/s) = 0

0.1 kg × v₁ = 5 kg × 5 m/s

v₁ = (5 kg × 5 m/s)/(0.1 kg) = 250 m/s

The forward velocity of the bullet, v₁ = 250 m/s

6 0
3 years ago
A heat engine: A) converts heat input to an equivalent amount of workB) converts work to an equivalent amount of heat C) takes h
Masja [62]

Answer:

C. Takes heat in, does work, and loses energy heat.

Explanation:

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The key characteristic of a heat engine is that the substance with which work is done by, goes from a higher temperature to a lower temperature.

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3 0
3 years ago
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