3 years ago

A sound wave increases in pitch. Which of the following changes has occurred?

Physics

1 answer:

statuscvo [17]3 years ago

6 0

<span>If the pitch of a sound increased, then the wave frequency increased. (D)</span>

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A 120 V potential difference is applied to a space heater that dissipates 674 W during operation. (a) What is its resistance dur

Annette [7]

Answer:

(a) 21.36 ohms

(b) 5.62 A

Explanation:

Parameters given:

Potential difference, V = 120 V

Power, P = 674 W

(a) Power is given as:

P = V²/R

Where R is resistance

=> R = V²/P

R = 120²/674

R = 14400/674

R = 21.36 ohms

(b) Power is also given as:

P = I*V

Where I = Current (time rate of flow of Electric charge)

=> I = P/V

I = 674/120

I = 5.62 A

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3 years ago

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A bucket of mass M (when empty) initially at rest and containing a mass of water is being pulled up a well by a rope exerting a

Naily [24]

Answer:

$V=\dfrac{PT}{m}\ ln\dfrac{M+m}{M}-gT$

Explanation:

Given that

Constant rate of leak =R

Mass at time T ,m=RT

At any time t

The mass = Rt

So the total mass in downward direction=(M+Rt)

Now force equation

(M+Rt) a =P- (M+Rt) g

$a=\dfrac{P}{M+Rt}-g$

We know that

$a=\dfrac{dV}{dt}$

$\dfrac{dV}{dt}=\dfrac{P}{M+Rt}-g$

$\int_{0}^{V}V=\int_0^T \left(\dfrac{P}{M+Rt}-g\right)dt$

$V=\dfrac{P}{R}\ ln\dfrac{M+RT}{M}-gT$

$V=\dfrac{PT}{m}\ ln\dfrac{M+m}{M}-gT$

This is the velocity of bucket at the instance when it become empty.

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4 years ago

Please Help Me!!!.........

Effectus [21]

C look at how many oxygen, nitrogen’s, and hydrogens there are

8 0

3 years ago

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Which of these best describes how the kinetic energy of carbon dioxide molecules change as the carbon dioxide is heated?

spin [16.1K]

B.
carbon dioxide molecules have more energy; therefore, the kinetic energy increases

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4 years ago

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Nearly all conventional piston engines have flywheels on them to smooth out engine vibrations caused by the thrust of individual

Artyom0805 [142]

Answer:

This is because, the flywheel has a very large moment of Inertia and hence sudden piston torques have negligible effect on the flywheel, but every piston combined has a significant torque. This smoothens out the vibrations.

Explanation:

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4 years ago