Answer:
42.11 sec
Explanation:
In first part : The truck start from the rest that is u = 0 m/sec
Acceleration is given as
It reaches to a velocity of 22 m/sec so v=22 m/sec
Now according to first law of motion
In second part : The truck maintain a constant speed for 22 sec
In third part : The truck takes an additional 4.4 sec for stopping
So total time in which the truck is in motion =15.71+22+4.4=42.11 sec
Answer:
(a) Volume of the tank is
(b) Temperature is
Pressure is 21.3 kPa
(c) The change in internal energy is 1373.54 kJ/kg
Solution:
As per the question:
Mass of liquid in the tank, m = 1.4 kg
Temperature, T =
Volume occupied by water, V = 25% = 0.25
Volume occupied by air, V' = 75%
where
= Volume of tank
Now,
(a) In order to calculate the volume of the tank, we make use of the steam table for specific volume at as given temperature:
At , the specific volume, v = 0.001157
At , the internal energy, u = 850.46 kJ/kg
Now, Volume of water, V = mv =
Thus
(b) For the final temperature and pressure, we calculate the specific volume, v' and then find the corresponding temperature and pressure from the steam table:
v' =
The corresponding temperature to this specific volume, T' =
The corresponding pressure to this specific volume, P' = 21.3 kPa
The corresponding internal energy to this specific volume, u' = 2224 kJ/kg
(c) The change in the internal energy of water is given by:
Answer:
the amount of heat that gets through both the wires will be same.
Explanation:
By the Fourier's law of conduction we have:
where:
= rate of heat transfer
k = thermal conductivity of the material
A = area of the material
dT = temperature difference across the length dx
According to the question, the system to be analysed is isolated from the surrounding.
Until the thermal equilibrium is established between aluminium and copper wires the amount of heat that gets through both the wires will be same.
<em>But the rate of heat transfer through the aluminium will be greater as it has double the thermal conductivity of copper.</em>