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Rasek [7]
4 years ago
11

8 Grade Science Explain how a Lava lamp demonstrates convection currents. ​

Physics
1 answer:
Greeley [361]4 years ago
5 0

Answer:

As a substance gains heat energy (in the case of the lava lamp, heat is transferred from the hot light bulb to the lava), it becomes less dense than the surrounding liquid ), causing the substance to rise.

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Chemical reactions at varying depths on other planets, such as Jupiter, result in what?(1point)
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A cartridge electrical heater is shaped as a cylinder of length L = 200 mm and outer diameter D = 20 mm. Under normal operating
KengaRu [80]

Answer:

Ts=51.83C

Explanation:

First we calculate the surface area of ​​the cylinder, neglecting the top and bottom covers as indicated by the question

Cilinder Area= A=πDL

L=200mm=0.2m

D=20mm=0.02m

A=π(0.02m)(0.2m)=0.012566m^2

we use the equation for heat transfer by convection

q=ha(Ts-T)

q= heat=2Kw=2000W

A=Area=0.012566m^2

Ts=surface temperature

T=water temperature=20C

Solving for ts

Ts=q/(ha)+T

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4 0
3 years ago
Which equation shows the mathematical relationship between the frequency and the period of a wave?
mihalych1998 [28]

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8 0
3 years ago
Read 2 more answers
A speaker fixed to a moving platform moves toward a wall, emitting a steady sound with a frequency of 235 Hz . A person on the p
Anvisha [2.4K]

Answer:

vr = 4.336 m/s

Explanation:

We are given that;

Beat frequency is 6Hz

Speed of sound = 344 m/s

Now,

Reflective Doppler frequency; f = 235 + 6 = 241 Hz

We can calculate the observed frequency if both the source sound and the observer are moving towards each other. In this case, the formula is:

f = fo[(c + vr)/(c + vs)]

Where;

ƒ = observed frequency

c = speed of sound

vs = velocity of source (negative if it’s moving toward the observer)

ƒ0 = emitted frequency of source

Since it’s moving toward the observer, thus we can rewrite equation as;

f = fo[(c + vr)/(c - vs)]

We have that;

fo = 235 , f = 241 , c = 344 , vr=vs

Thus,

241 = 235[(344+vr)/(344-vr)]

241(344 - vr)= 235(344 + vr)

82904 - 241vr = 80840 + 235vr

82904 - 80840 = 241vr + 235vr

2064 = 476 vr

vr = 2064/476

vr = 4.336 m/s

5 0
3 years ago
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