Hi there!
Recall the equation for centripetal force;

m = mass (kg)
v = velocity (m/s)
r = radius (m)
We are not given the mass directly, we are given the object's weight.


Now, we can plug this value along with the given velocity and radius to solve:

Answer:
1.435 x 10^-4 cm^3/s
Explanation:
coefficient of viscosity, η = 0.028 poise
Radius, R = 0.008 cm
length, l = 2 cm
Pressure, P = 5000 dyne/cm^2
The Poiseuille's formula is given below

Where, V is the rate of flow, that means volume flowing per second

V = 1.435 x 10^-4 cm^3/s
Thus, the rate of flow is 1.435 x 10^-4 cm^3/s.
The answer would be an alpha particle because the beta particle doesn't carry the amount of protons and neutrons.
There is no SI "base unit" of density.
(Any unit of mass) divided by (any unit of volume) is
a valid unit of density.
The units of density that are seen most often are
(gram per cm³) and (kgm per meter³) .