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4 years ago

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Help! I’ll give brainliest! If an observer is hearing a rising pitch, that means that the frequency of the waves in their positi

on is falling.
True or false?

2 answers:

Basile [38]4 years ago

6 0

False because if it's getting higher/rising that doesn't mean it's getting lower (my opinion Idk if correct, it's just common sense.)

Leno4ka [110]4 years ago

3 0

The statement is false.

Pitch of a sound wave is the quantity that determines how high or low a sound is when it is perceived. A higher pitch corresponds to a higher frequency.

There could be another case, the Doppler's effect. the source or the observer might be moving towards the other. In such cases, the frequency of the sound wave does not change but it appears to be rising due to the motion.

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1. A heat engine operates between two reservoirs at T2 = 600 K and T1 = 350 K. It takes in 1.00 x 103 J of energy from the highe

Alex73 [517]

Answer:

$\Delta S_u=2.1429\ J.K^{-1}$

$W_c=416.67\ J$

Explanation:

Given:

temperature of source reservoir, $T_H=600\ K$

temperature of sink reservoir, $T_L=350\ K$

energy absorbed from the source, $Q_{in}=1000\ J$

work done, $W=250\ J$

a.

<u>Now change in entropy of the surrounding:</u>

$\Delta S_u=\frac{dQ_L}{T_L}$

<em>Since heat engine is a device that absorbs heat from a high temperature reservoir and does some work giving out heat in the universe as the byproduct.</em>

$\Delta S_u=\frac{Q_H-W}{T_L}$

$\Delta S_u=\frac{1000-250}{350}$

$\Delta S_u=2.1429\ J.K^{-1}$

b.

<u>We know Carnot efficiency is given as:</u>

$\eta_c=1-\frac{T_L}{T_H}$

$\eta_c=1-\frac{350}{600}$

$\eta_c=0.4167$

<u>Now the Carnot work done:</u>

$W_c=Q_H\times \eta_c$

$W_c=1000\times 0.4167$

$W_c=416.67\ J$ .......................(1)

c.

From eq. (1) we have the Carnot work, so the difference:

$\Delta W=W_c-W$

$\Delta W=416.67-250$

$\Delta W=166.67\ J$

Now, we find:

$T_L.\Delta S_u=350\times 2.1429$

5 0

3 years ago

When testing a laptop power connector, how close should the voltage measured be to the accepted voltage of the laptop?

elixir [45]

When testing a laptop power connector, the voltage measured has be close to +/- 5% to the accepted voltage of the laptop. This is to ensure that the power connector would not pose any hazard to the user and is safe for use. So, for instance the accepted voltage is 19 V, when you test the power connector it should be that the reading is between 18 V to 20 V. Any reading below or above that range is not recommended for use. You can locate the accepted voltage on the battery or the laptop itself. To test a power connector, you can use a volt meter or a multi meter.

4 0

3 years ago

Physicists often measure the momentum of subatomic particles moving near the speed of light in units of MeV/c, where c is the sp

maxonik [38]

Answer:

kg m/s

Explanation:

e = Charge = C

V = Voltage = $\dfrac{N}{C}m$

c = Speed of light = m/s

Momentum is given by

$\dfrac{MeV}{c}=\dfrac{e\times V}{c}\\\Rightarrow \dfrac{MeV}{c}=\dfrac{C\times \dfrac{N}{C}\times m}{m/s}\\\Rightarrow \dfrac{MeV}{c}=Ns\\\Rightarrow \dfrac{MeV}{c}=kg\times \dfrac{m}{s}\times s\\\Rightarrow \dfrac{MeV}{c}=kg\cdot m/s$

The unit of MeV/c in SI fundamental units is kg m/s

5 0

3 years ago

pls help me on this i need help on the definitions for it they dont match the ones my teacher gave me

elena55 [62]

Liquid = B
plasma = C
solid = A
gas = D

8 0

3 years ago

Read 2 more answers

Which describes how chemical changes are different from physical changes?

lions [1.4K]

Answer:

B. Chemical changes involve the formation of a new substance.

Explanation:

They can both release energy, both can be measured, and chemical changes can be caused by oxygen, so I believe it would be B.

6 0

4 years ago