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scZoUnD [109]
3 years ago
15

if heat energy is transferred from direct contact between a warm and a cold object it has been transferred by what ?

Physics
1 answer:
Katarina [22]3 years ago
5 0

When heat energy is transferred from direct contact between a warm and a cold object , it is known as heat transfer by conduction.

In conduction, the heat transfer takes place within an object or between two objects in contact until the temperature becomes uniform. this kind of heat transfer continues until the temperature at two ends between which the heat transfer take place , becomes equal.  Heat transfer takes place from point at high temperature to point at lower temperature.

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Explanation:

velocity gradient= velocity/distance

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The open-circuit voltage of a car battery is measured to be 12 V. During engine startup, the battery delivers 10 A to the starte
dmitriy555 [2]

Answer:

- the Thevenin equivalent circuit for the battery is uploaded below

- the battery delivered 117 watts of power to the starter motor

Explanation:

Given the data in the equation

diagram of the Thevenin equivalent circuit for the battery is uploaded below.

Current I = 10 A

Voltage 1 = 12 V

voltage 2 = 11.7 v

R = (V1 - V2) / I

R = (12-11.7)/10

R = 0.3 / 10

R = 0.03Ω

Thevenin equivalent circuit

R_{L} = V2 / I = 11.7 / 10

R_{L} = 1.17Ω

so, power delivered to the starter motor will be;

p = (V2)² / R_{L}

P = ( 11.7 V )² / 1.17Ω

p =  136.89 / 1.17

p =  117 watts

Therefore, the battery delivered 117 watts of power to the starter motor

8 0
3 years ago
Would you hear an echo if you shouted in your bedroom? Explain your answer.
nasty-shy [4]

Answer:

no you would not hear an echo if you shouted in your bedroom

Explanation:

Echo is a sound produced when the original sound is reflected by walls of a given room. ... So for the case of a bedroom, no echo is produced because there are stuff and the furniture block the sound from reaching the wall hence no bouncing back of sound.

so sorry if i'm wrong :)

6 0
3 years ago
If a car accelerates at 6.4 m/s?
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  • initial velocity=u=0
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Final velocity be v

According to first equation of kinematics

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  • v=57.6m/s
6 0
3 years ago
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