Answer:
The theoretical density for Niobium is
.
Explanation:
Formula used :

where,
= density of the unit cell
Z = number of atom in unit cell
M = atomic mass
= Avogadro's number
a = edge length of unit cell
We have :
Z = 2 (BCC)
M = 92.91 g/mol ( Niobium)
Atomic radius for niobium = r = 0.143 nm
Edge length of the unit cell = a
r = 0.866 a (BCC unit cell)


On substituting all the given values , we will get the value of 'a'.


The theoretical density for Niobium is
.
Answer:
Grade is 10.32%
Explanation:
Given data:
stopping side distance is 800ft
t = 2.5 sec
design speed v = 65 miles/hr
a/g value is 0.35
stopping side distance is SSD

plugging all value for G



G = 0.1032
Grade is 10.32%
Answer:

Explanation:
m = Mass of satellite = 15000 kg
h = Distance above Earth = 800 km
R = Radius of Earth = 6371 km
M = Mass of Earth = 
G = Gravitational constant = 
Potential energy is given by

The potential energy of the satellite is
.
Answer:
because it is not over the world please me 25 kilometre