Search & Filtering
1 kg of air at 7 bar pressure and 90 temperature undergoes a non-
flow polytropic process. The law of expansion is p
=Constant.
The pressure falls to 1.4 bar during the process.
Calculate: (1) Final Temperature (2) Change in Internal energy (3)
Work done (4) Heat exchange. Take R=287J/kg-K and = 1.4 for air
The positions, of a particle moving along a horizontal straight line is given by the equation s =
6t² - 4, where s is in meter and t is the time in seconds. The particle is 4m to the right of the
origin when t = 0.
A.1. Determine the displacement of the particle during the time interval from t = 2s to t = 4s.
A.2. Determine the velocity and acceleration of the particle when t = 4s.
Three inductive coil Having but I understand soft 20 ohm and reactance of 50 15 ohm are connected in star across the three phase 400 volt 50 years supply calculate the reading of two or meter connected in the circuit to measure the power input.
Radiocarbon Dating Analysis
Radiocarbon dating analysis is a technique used by archeologists and paleonto-
logists to determine the approximate age of an organic sample. It uses C-14/
C-12 ratios to determine the time that has elapsed since a living organism has
died.
a. What is the idea behind this technique? Explain this process. Use illustrations.
b. How is the C-14/C-12 ratio of samples measured?
c. Will radiocarbon dating analysis work for metallic artifacts? What are your
reasons behind your response?
d. Suppose a piece of cloth was found to contain a third of its original C-14/C12
ratio, what is the approximate age of the sample? State any assumptions you
made during calculation.
Harnessing the Power of the sun
a. Write the equation for the nuclear fusion reaction of deuterium to helium.
Explain this process. Use illusrations.
b. How much energy is released by the sun in a minute? Use Einstein’s equation
for special relativity.
c. Do you think the nuclear fusion reaction inside the sun’s core will cease at
some point? Explain your reasons for believing such a case.
d. How did astronomers determine the elemental composition of the sun?
e. Do you think this process could be replicated here on Earth?
1.)Can you think of other theoretical methods of producing gold from non-
precious metals like iron and copper?
A series RLC circuit consists of a 20 Ω resistor, a 51 μF capacitor, and a 25 mH inductor. If the source frequency is 50 Hz, and the circuit current is 350 mA, what is the applied voltage?
The main ways for improving the performances of the Brayton cycle are staged compression with intercooling and reheating. Extend these methods to the main turbine engines cycles for aviation: turbojet, turbofan and turboprop and explain where each or both methods might work or not and give appropriate reasons
A mild steel ring having cross sectional area of 5 cm square and mean circumference of 40 cm has coil of 200 turns wound uniformly around it calculate reluctance at required to produce flux of 800ùrwb Assume ùr for mild steel to be 380 at flux density developed in core
Two boilers one with super heater and other without super heater are delivering equal quantities of steam into a common main. The pressure in the boilers and main is18 bar. The temperature of steam from a boiler with a super heater is 350°C and temperature of
the steam in the main is 250°C.
Determine the quality of steam supplied by the other boiler. Take Cpsteam = 2.25 kJ/kgK.
