Ask question

Ask question

All categories

svet-max [94.6K]

3 years ago

15

Select the correct answer.

1 answer:

kherson [118]3 years ago

4 0

Answer:

B chemical energy

Explanation:

You might be interested in

A vertical piston-cylinder device initially contains 0.1 m^3 of air at 400 K and 100 kPa. At this initial condition, the piston

jenyasd209 [6]

Answer:

$Q=-38.15kJ$

Explanation:

From the question we are told that

Piston-cylinder initial Volume of air $v_1=0.1 m^3$

Piston-cylinder initial temperature $T_1=400k$

Piston-cylinder initial pressure $P_1= 100kpa$

Supply line temperature $T_s=400k$

Supply line pressure $P_s= 500kpa$

Valve final pressure $P_v=500kpa$

Piston movement pressure $P_m=200kpa$

Piston-cylinder final Volume of air $v_2=0.2 m^3$

Piston-cylinder final temperature $T_2=440k$

Piston-cylinder final pressure $P_2= 500kpa$

Generally the equation for conservation of mass is mathematically given by

$Q=m_2 \mu_2-m_1 \mu_1 +W-(m_2-m_1)h$

where

Initial moment

$m_1=\frac{p_1 V_1}{RT_1}$

$m_1=\frac{100*0.1}{0.287*400}$

$m_1=8.7*10^-^2kg$

Final moment

$m_2=\frac{p_2 V_2}{RT_2}$

$m_1=\frac{500*0.3}{0.287*440}$

$m_1=79*10^{-2}kg$

Work done by Piston movement pressure

$W=Pd$

$W=P(v_2-v_1)$

$W=200(0.2-0.1))$

$W=20000J$

Heat function

$h=cT_1$

$h=1.005(400)$

$h=402$

Therefore

$Q=(0.792*0.718(440)-0.0871*0.718(400)+20-(0.792-0.087)*402))$

$Q=-38.15kJ$

It is given mathematically that the system lost or dissipated Heat of

$Q=-38.15kJ$

7 0

3 years ago

Light undergoes refraction as it travels from water to glass. The refractive index of water = 1.33 and refractive index of glass

cestrela7 [59]

Answer: 28°

Explanation:

Snell's law n₁sinθ₁ = n₂sinθ₂

1.33sin32 = 1.5sinθ₂

θ₂ =28°

3 0

3 years ago

write your thoughs about this why do you think there were improvents or decline in your physical fitness assessment result PA HE

Dimas [21]

I guess there are more lazy people now.

5 0

3 years ago

Q25) A room whose length is 10 m and its width is 8 m, using ceramic as its floor. The size of the

mariarad [96]

Answer:

2000 pieces

Explanation:

The number of tiles is given by dividing the area of room by the area of each tile. In this case,

thw areas are as shown below

Area of room is 8*10= 80 m2

Converting dimensions of tiles from cm to m then

Area of tiles is 0.2*0.2= 0.04 m2

No of tiles is 80/0.04=2000 tiles

7 0

3 years ago

The density of table sugar is 1.59 g/cm3. What is the volume of 7.85 g of sugar?

Likurg_2 [28]

$\frac{7.85g }{1.59 \frac{g}{ cm^{3} } }$ = 4.937 $cm^{3}$

4 0

4 years ago