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Heat & Thermodynamics
At triple point of water, the pressure of gas is 2680 Pa. By changing T the pressure changed to 4870 Pa. The value of T is?
- 496 K
- 438 K
- 438 F
p.V = n.R.T
Since volume V and mass hence number of moles is constant:
p/T = n.R/V = constant
=> p1/T1 = p2/T2
=> T2 = T1.p2/p1
T1 is the triple point temperature of water, i.e
T1 = 0.010C = 273.16 K
T2 = 273.16 K * 4870Pa/2680Pa = 496.38K
Water hose with internal radius of 0.01m has water flowing at the rate of 10 kg per 20s. What is the water speed at the outlet? Density of water is 1000 kg/m3.
From continuity equation A*V = flow rate of water = volume/s;
Volume/s = mass/s * density = 0.5/1000;
A*V = 0.5/1000; A = 3.14 * (0.01)2;
V = 0.5/ (3.14*(0.01)2*1000) = 1.6m/s
If energy of photon is 5 MeV. Kinetic energy of particles after pair production is?
- 4 MeV
- 5 MeV
- 6 MeV
- Not enough information given
Energy of photon = Energy required for pair production + KE of particles. Now energy required for pair production is 1.02 MeV so KE is approximately equal to 5-1 = 4 MeV.