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3 years ago

13

When you have a pot of water on the stove, heat is transferred to the water. Describe the behavior of the water molecules and ho

w temperature is affected.
Pls explain...

1 answer:

Digiron [165]3 years ago

3 0

The hotter molecules become, the faster they move around. The colder they are, the more slow and lethargic they are

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A 500,000 kg cargo ship is traveling at 75 km/h when its engine is shut off. The magnitude of the frictional force between boat

Ymorist [56]

Answer:1.8 hr

Explanation:

Given

mass of cargo=500,000 kg

initial speed $=75 km/h\approx 20.833 m/s$

Frictional force=85 v

at t=0 engine is shut off so acquired speed is slowly decreasing

$85v=-500,000\frac{\mathrm{d} v}{\mathrm{d} t}$

$85dt=-\frac{dv}{v}$

Integrating both sides

$85\int_{0}^{t}dt=-500,000\int_{20.83}^{6.944}\frac{dv}{v}$

$85t=500,000\ln \frac{1}{3}$

t=6462.425 s

t=1.8 hr

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3 years ago

An ideal monatomic gas initially has a temperature of T and a pressure of p. It is to expand from volume V1 to volume V2. If the

yawa3891 [41]

Answer:

Isothermal : P2 = ( P1V1 / V2 ) , work-done $pdv = nRT * In( \frac{V2}{v1} )$

Adiabatic : : P2 = $\frac{P1V1^{\frac{5}{3} } }{V2^{\frac{5}{3} } }$ , work-done =

W = $(3/2)nR(T1V1^(2/3)/(V2^(2/3)) - T1)$

Explanation:

initial temperature : T

Pressure : P

initial volume : V1

Final volume : V2

A) If expansion was isothermal calculate final pressure and work-done

we use the gas laws

= PIVI = P2V2

Hence : P2 = ( P1V1 / V2 )

work-done :

$pdv = nRT * In( \frac{V2}{v1} )$

B) If the expansion was Adiabatic show the Final pressure and work-done

final pressure

$P1V1^y = P2V2^y$

where y = 5/3

hence : P2 = $\frac{P1V1^{\frac{5}{3} } }{V2^{\frac{5}{3} } }$

Work-done

W = $(3/2)nR(T1V1^(2/3)/(V2^(2/3)) - T1)$

Where $T2 = T1V1^(2/3)/V2^(2/3)$

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3 years ago

The reaction between magnesium (Mg) and oxygen (O2) forms magnesium oxide (MgO).

Scorpion4ik [409]

Answer:

2 Mg + O2 = 2MgO

Type: Synthesis

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3 years ago

The brakes on a truck fail as it approaches a car stopped at a red light. Use Newton’s first and second law of motion to explain

PolarNik [594]

newtons first law states that a object in motion will stay in motion unless acted on by an outside force and an object at rest will stay at rest for the same reason. the force of a moving object is equal to its mass times its acceleration.

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3 years ago

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The velocity of a car increases by 40 m/s in 80 seconds. What is the acceleration of the car

yan [13]

Given that the velocity of a car increases by 40 m/s in 80 seconds, the acceleration of the car will be given by:
a=(final velocity-initial velocity)/(time)
thus;
final velocity=40 m/s
initial velocity=0
time=80 seconds
hence;
a=(40-0)/80
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3 years ago