Physics Answers

Consider a thermodynamic system consisting of 3 mol of an ideal gas occupying

0.03 m3

volume at 300 K temperature. Determine its initial pressure. For this

gas, γ=1.4. It undergoes the following processes:

i) It is compressed to 0.01 m3

volume isothermally. Determine the pressure of the

gas.

ii) then it is allowed to expand adiabatically, till it attains 1 atm pressure. Determine

the final volume. (1 atm = 101325 Nm-2

)

Draw a labeled indicator diagram of these processes.

A flywheel has a moment of inertia of 4.8 kg-m2 . What constant force is required to increase its

frequency from 3 rev/s to 6 rev/s in 7 revolutions?

A 200 m long aluminum wire has the same resistance and cross-section area as a carbon wire. What is the length of the carbon wire?

A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance?

An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff.

An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff.

A steadu current of 2.0 A flows in a wire for 16.0s (a) How many coulombsof a charge flow

through the wire? (b) How many electrons flow through the wire for the given time interval?

If the current (I) in a long solenoid is doubled and number of turns per unit length (n) are halved, find the effect on the magnetic field (i) inside and (ii) outside the solenoid.

In a current carrying solenoid, determine the 𝑑𝐵/𝑑𝑥 value at the (i) both ends and (ii) centre of the solenoid.

Explain two key differences between De Sauty’s Bridge and Carey Foster’s Bridge.