Answer:
Explanation:
Kinetic energy of a gas molecule = 3/2 k T
1/2 m v² = 3/2 k T
v² ∝ T
(v₁ / v₂)² = T₁ / T₂
( 180 / 48.4 )² = 270 / T₂
13.83 = 270 / T₂
T₂ = 19.52 K .
Exit temp = 19.52 K .
Well the accretion disk around a neutron star is much hotter and emits higher energy radiation
Answer:
the maximum angular speed (in radians per second) of a Blu-ray disc as it rotates is 57.6 m/s
Explanation:
Given information:
diameter of the disc, d = 11 cm, r = 5.5 cm = 0.055 m
angular speed ω = 10000 rev/min = (10000 rev/min)(2π rad/rev)(1/60 min/s)
= 1000π/3 rad/s
to calculate the maximum angular speed we can use the following formula
ω = v/r
v = ωr
= (1000π/3)(0.055)
= 57.6 m/s
The maximum pressure variations the human ear can withstand above and below atmospheric pressure is around 30 pa. the normal atmospheric pressure is around 101325 pa. hence the variation in the maximum pressure for human ear is very small as compared to the atmospheric pressure. if the ear is exposed to a pressure greater than this , it can cause permanent damage to the ear.
