Answer:
Workdone =0
Explanation:
The body is inclined at θ=30°, s=10m, m=5kg
Workdone by the object = FsCosθ
but the surface is a friction-less surface, this means coefficient of friction =0
F=μR
F=0*R
F=0
W=FScosθ
W=0*SCosθ
W=0
Answer:
Potassium is more reactive
Explanation:
Answer:
The separation between the two lowest levels = 
The values of n where the energy of molecule reaches 1/2 kT at 300K = 
The separation at this level = 1.8 * 
J
Explanation:
Knowing the formula
En = 
Mass of oxygen molecule
m (O2) = 32 amu * 
So the energy diference between the two lowest levels:
E2 - E1 = 
E2 - E1 = 
Now we should find n where the energy of molecule reaches 1/2 kT
En = = 
= 
by the end is necessary to calculate the separation of the level
En - En-1 = 
= 1.8 * J
Answer:
7066kg/m³
Explanation:
The forces in these cases (air and water) are: Fa =mg =ρbVg Fw =(ρb −ρw)Vg where ρw = 1000 kg/m3 is density of water and ρb is density of the block and V is its density. We can find it from this two equations:
Fa /Fw = ρb / (ρb −ρw) ρb = ρw (Fa /Fa −Fw) =1000·(1* 21.2 /21.2 − 18.2)
= 7066kg/m³
Explanation:
The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.
