A. The formula for mean free time is:
t = V/(4π√2 r²vN)
where
N = 1×10¹⁶ molecules (per m³)
V = 1 m³
r = 111×10⁻⁷m (atomic radius of silicon)
Let's solve for v first:
v = √(3RT/M) = √(3(8.314 m³·Pa/mol·K)(25 + 273 K)/28.1 g/mol Si)
v = 16.26 m/s
t = (1 m³)/(4π√2 (111×10⁻⁷m)²(16.26 m/s)(1×10¹⁶ molecules))
<em>t = 2.81×10⁻9 s</em>
<em>Pure silicon has a high resistivity relative to copper because copper is a conductor, while silicon is a semi-conductor. </em>
Answer:
Explanation:
Bridge length A B = 36.5 m
weight W = 2.56 x 10⁵ N acting at middle point that is at 18.25 m from either end.
weight of truck W₁ = 5.25 x 10⁴ N standing at 10.2 m from A .
Let force at A be F₁ and at B be F₂ .
Balancing total upward and downward force
F₁ + F₂ = ( 2.56 + .525 ) x 10⁵ = 3.085 x 10⁵ N
Taking torque of all the forces , for rotational balancing
2.56 x 10⁵ x 18.25 + .525 x 10⁵ x 10.2 = F₂ x 36.5
(46.72 + 5.355 )x 10⁵ = F₂ x 36.5
F₂ = 1.42 x 10⁵ N
F₁ = 1.665 x 10⁵ N
Answer:
Distance - 1000m
Time - 20min
Speed - ?
Use the formula of distance ÷ time = speed.
s = d/t
s = 1000m/20min
s = 50 m/min
Hope this helps, thank you !!