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3 years ago

A book lying on your desk will only move if:

Physics

2 answers:

liq [111]3 years ago

8 0

Answer:

A frictional force acts on it

34kurt3 years ago

4 0

Answer:

a frictional force acts on it

Explanation:

please mark brainiest hope it works out for you

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Neon is compressed from 100 kPa and 24°C to 500 kPa in an isothermal compressor. Determine the change in the specific volume and

trasher [3.6K]

Answer:

ΔV = -0.97 m³/ kg

ΔH = 0 kJ/ kg

Explanation:

To determine the change in the specific volume we need to use the ideal gas law:

$PV = RT$

where P: pressure of the gas V: volume of the gas, R: ideal gas constant= 0.4119 kJ/kg.K = 0.4119 kPa.m³/kg.K and T: temperature of the gas.

The V₁, at a compressed pressure is:

$V_{1}= \frac {RT}{P_{1}}$

$V_{1}= \frac {0.4119 \frac{kPa\cdot m^{3}}{kg\cdot K} \cdot (24 + 273 K)}{100 kPa}$

$V_{1}= 1.22 \frac{m^{3}}{kg}$

Similarly, the V₂ is:

$V_{2}= \frac {RT}{P_{2}}$

$V_{2}= \frac {0.4119 \frac{kPa\cdot m^{3}}{kg\cdot K} \cdot (24 + 273 K)}{500 kPa}$

$V_{2}= 0.25 \frac{m^{3}}{kg}$

Now, the change in the specific volume because the compressor is:

$V_{2} - V_{1} = 0.25 - 1.22 \frac{m^{3}}{kg}$

$V_{2} - V_{1} = -0.97 \frac{m^{3}}{kg}$

Finally, to calculate the change in the specific enthalpy, we need to remember that neon is an ideal gas and that is an isothermal process:

$\Delta H = C_{p} \cdot \Delta T$

$\Delta H = 1.0299 \frac{kJ}{kg \cdot K} \cdot 0$

$\Delta H = 0 \frac{kJ}{kg}$

Have a nice day!

7 0

4 years ago

The normal eye, myopic eye and old age

Leviafan [203]

Answer:

length f′0 when the eye is presbyopic and by a screen (the retina) at the distance d from the

Explanation:

7 0

3 years ago

what will be the effect on the acceleration due to gravity of the earth if it is compressed to a the size the moon?

GuDViN [60]

Answer:

it gravitional pull on earth will increased becauste it is compress to a form of moon which is comperatively smaller so the gravitonal pull on per cm of earth will incrased so we can say that there will be change in acceleration due to gravity

7 0

3 years ago

Read 2 more answers

A car driving around a track is an example of projectile motion. a. True b. False

Degger [83]

the answer is.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................FALSE. You are welcome everybody :) GOod luck to all of you people. Peace love and coconut oil ॐ

5 0

3 years ago

Read 2 more answers

The mass of a proton is 1833 times larger than the mass of an electron. When a proton an electron interact with each other the o

Ad libitum [116K]

B. Exactly the same as the electric force of the electron on the proton.

Explanation:

Even if the mass of proton is increased or decreased, the force between electron and proton will remain the same because force is dependent on the charge of the object and distance between them. The force between the charges is independent of their masses. So, even if the mass of a proton is 1833 times larger than the mass of an electron, the force between them will be same.

According to Coulomb's law:

$F = k\frac{q_1q_2}{r^2}$

where,

F is the force

q₁ and q₂ are the charges

r is the distance between the charges

8 0

3 years ago