Answer:
2.097×10^-5 N
Explanation:
Viscosity = mass/distance×time
time (t) = mass/viscosity×distance
Mass of steel part = 200 kg
Viscosity of oil = 0.065 N.s/m^2
Distance = 0.5 mm = 0.5/1000 = 5×10^-4 m
t = 200/0.065×5×10^-4 = 6.2×10^6 s
Force (F) = mass×velocity/time = 200×0.65/6.2×10^6 = 2.097×10^-5 N
v = u + at where v = final speed, u = initial speed , a = acceleration and t = time.
so here final speed v = 30 + 2*4 = 38 m/sec. answer
Distance travelled during this time
= (30 + 38) * 4 / 2 = 68 * 2 = 136 m answer
Answer:
center of mass of the two masses will lie at x = 2.52 cm
center of gravity of the two masses will lie at x = 2.52 cm
So center of mass is same as center of gravity because value of gravity is constant here
Explanation:
Position of centre of mass is given as
here we have
now we have
so center of mass of the two masses will lie at x = 2.52 cm
now for center of gravity we can use
here we have
now we have
So center of mass is same as center of gravity because value of gravity is constant here
Protons and Neutrons account for most of an atoms mass
Answer:
wool maybe, I was a bit confused in silk and wool but wool