Question

All formulas of physics of class 9

Answer 1

Density is mass per unit volumeDensity = mass / volumevelocity = displacement / timeForce = rate of change of momentumMomentum = mass

.

velocityPower is rate of work donePower = work / timeUnit of power is watt

Potential energy (P)

PE = m.g.hm = massg = acceleration due to gravity (9.81m/s

2

)h = height

Kinetic energy (P)

P = (1/2).m.v

2

m = massv = velocity

Gravity (Force due to gravity)

F

g

: Force of attractionG : Gravitational constantM

1

: Mass of first objectM

2

: Mass of second objectAcceleration due to gravity at a depth 'd' from earth surface is :Acceleration due to gravity at height 'h' from earth surface is :h is very much smaller than R

Escape velocity

Escape velocity

from

a body of mass M and radius r isFor example if you want to calculate the escape verlocity of sa object fromearth then,M is dmass of earthr is radius of earth

OPTICS

Index of refraction

n = c/vn - index of refractionc - velocity of light in a vacuumv - velocity of light in the given material

Under constant acceleration linear motion

v = final velocityF

g

=G M

1

M

2

r

2

g

d

= g(1-d)Rg

h

= g(1-2h)R

Answer 2

Answer:

hope it's will help you...