Answer:
a = 9.94 m/s²
Explanation:
given,
density at center= 1.6 x 10⁴ kg/m³
density at the surface = 2100 Kg/m³
volume mass density as function of distance

r is the radius of the spherical shell
dr is the thickness
volume of shell

mass of shell


now,

integrating both side



we know,




a = 9.94 m/s²
They only conduct when they are in solution form, because then their ions become mobile, and the ions conduct electricity.
Hope this helps!
Answer:
Polymers are widely used advanced materials, which are found almost in every material used in our daily life. ... The rapid increase in demand for the manufactured products introduce the new materials. These new materials are polymers, and their impact on the present way of life is almost incalculable.Explanation:
Answer:
The correct option is: B that is 1/2 K
Explanation:
Given:
Two carts of different masses, same force were applied for same duration of time.
Mass of the lighter cart = 
Mass of the heavier cart = 
We have to find the relationship between their kinetic energy:
Let the KE of cart having mass m be "K".
and KE of cart having mass m be "K1".
As it is given regarding Force and time so we have to bring in picture the concept of momentum Δp and find a relation with KE.
Numerical analysis.
⇒
⇒ 
⇒ 
⇒ 
⇒ 
⇒ 
Now,
Kinetic energies and their ratios in terms of momentum or impulse.
KE (K) of mass m.
⇒
...equation (i)
KE (K1) of mass 2m.
⇒ 
⇒
...equation (ii)
Lets divide K1 and K to find the relationship between the two carts's KE.
⇒ 
⇒ 
⇒ 
⇒ 
⇒
⇒ 
The kinetic energy of the heavy cart after the push compared to the kinetic energy of the light cart is 1/2 K.
Answer:
the force of friction = fk = (uk)n = 402(uk)
the net force acting to accelerate bookcase = ma = (41)(0.12) = 4.9 N
the {assumed horizontal} push force = 65 N
so
65 - fk = 4.9
fk = 65 - 4.9 = 60 N
uk = 60/402 = 0.15 <= ANS