Why is the value of g more in polar region than in equator ?

Suppose that we use a heater to boil liquid nitrogen (N2 molecules). 4480 J of heat turns 20 g of liquid nitrogen into gas. Note

love history [14]

Answer:

The energy is $9.4\times10^{-21}\ J$

(a) is correct option

Explanation:

Given that,

Energy = 4480 j

Weight of nitrogen = 20 g

Boil temperature = 77 K

Pressure = 1 atm

We need to calculate the internal energy

Using first law of thermodynamics

$Q=\Delta U+W$

$Q=\Delta U+nRT$

Put the value into the formula

$4480=\Delta U+\dfrac{20}{28}\times8.314\times77$

$\Delta U=4480-\dfrac{20}{28}\times8.314\times77$

$\Delta U=4022.73\ J$

We need to calculate the number of molecules in 20 g N₂

Using formula of number of molecules

$N=n\times \text{Avogadro number}$

Put the value into the formula

$N=\dfrac{20}{28}\times6.02\times10^{23}$

$N=4.3\times10^{23}$

We need to calculate the energy

Using formula of energy

$E=\dfrac{\Delta U}{N}$

Put the value into the formula

$E=\dfrac{4022.73}{4.3\times10^{23}}$

$E=9.4\times10^{-21}\ J$

Hence, The energy is $9.4\times10^{-21}\ J$

4 0

3 years ago

A tennis balls in the air and the potential energy increases. At the same time, it’s kinetic energy___because the velocity____

KengaRu [80]

Answer:

A

Explanation:

More potential energy equals more kinetic

8 0

3 years ago

A student pulls out his or her chair in order to sit down. The student pulls the chair 0.75 m with a force of 20 N. How much wor

IRINA_888 [86]

Work = Force x displacement
Force= 20N
Displacement= 0.75m

W= 20(0.75)
W= 15 Nm

3 0

3 years ago

1. Classify What type of heat transfer occurs

valentina_108 [34]

Convection because I’m in seventh grade

5 0

3 years ago

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What is newton's second law also give example

neonofarm [45]

$\textbf{Question:-}$

What is newton's second law of motion?Also give example.

$\textbf{Answer:-}$

Definition:-

Newton's Second Law of motion states that the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force. ie., F=ma.

Examples:-

When you are kicking a ball, you are increasing the speed by applying force to it. Therefore,it accelerates.
If you use the same force to push a truck and push a car, the car will have more acceleration than the truck.

Derivation:-

For a body of mass 'm' , whose velocity changes from u to v in time t, when Force 'F' is applied.

=>Force∝Change in momentum/Time

=>F∝mv-mu/t

=>F∝m(v-u)/t

=>F∝ma

=>F=kma(a=v-u/t)

=>F=ma(Since k=constant=1)

8 0

3 years ago

Read 2 more answers

Why is the value of g more in polar region than in equator ?​

Why is the value of g more in polar region than in equator ?