Physics - Online Test

R8=l(100−l)R8=6040so,8R=4060

The balance point when 8Ω is in the left gap will be 40 cm.

The forces on the system is restoring force F=−kx   and the damping force is F=−bv=−bdxdt    where  'k' is the force constant and 'b' is the damping constant

The net force is F= m*a  which is equal to the sum of restoring force F=−kx   and the damping force is F=−bv=−bdxdt

md2xdt2=−kx−bdxdt∴md2xdt2+kx+bdxdt=0

Gravity supplies the necessary centripetal force to hold a satellite in orbit about the earth. Setting the gravity force from the universal law of gravity equal to the required centripetal force yields the equation of  motion of satellites in the circular orbit

i.e Fgravity=Fcentripetal

⇒vorbital=GMr−−−√

Acceleration is the rate of change of velocity with time.It is a vector quantity.

Average acceleration is the change in velocity per unit time over an interval of time.

Let initial velocity at time interval t​​​​​​1 is v​​​​​​1 and final velocity at time interval t​​​​​2 is v​​​​​​2

Then

a⃗ avg=Δv⃗ Δt=v⃗ 2−v⃗ 1t2−t1

e=−L(didt)

e=−M(didt)