1800-150-456-789
FlagBACK
Flag General Physics> RElATIVE VELOCITY...
question mark

A person walking at 4m/s finds rain drops falling slantwise to his face with a speed of 4m/s at an angle of 30 degrees with the vertical. Show that the actual speed of the rain drops is 4m/s

Maithresh Pmr , 12 Years ago
Grade 12
anser 2 Answers
rupali sehgal

Last Activity: 12 Years ago

Velocity of rain wrt man= 4m/sat an angle 30º with vertical (given)

velocity of man wrt ground = 4m/s

from fig.

velocity of rain wrt man + velocity of man wrt ground = velocity of rain wrt ground (triangle law of vector addition)

so, velocity of rain wrt ground = √(4)2 + (4)2 + 2(4)(4)cos 120

                                          = √ 16+16+32(-0.5)

                                          =√32-16

                                          =√16 = 4m/s

hence proved!

Krishna

Last Activity: 6 Years ago

Vrm=4 m/s
Theta=30°
Vmg= 4 m/s
According to triangle law of vectors,
Velocity of man w.r.t ground, Vrg
=Vrm + Vmg
=Vrg
=√4*4 + 4*4 + 2*4*4cos120
=√32 - 16
=√16
=4
Hence proved
 

star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Other Related Questions on general physics

question mark
moment of inertia of a equilateral triangle about an axis passing through centre and perppendicular to the plane
general physics
1 Answer Available

Last Activity: 2 Years ago

question mark
. Because of the rotation of the earth, a plumb bob may not hang exactly along the direction of
the earth’s gravitational pull (its weight) but deviates slightly from this direction. Calculate the
deviation (a) at 40 latitude, (b) at the poles, and (c) at the equator
general physics
1 Answer Available

Last Activity: 2 Years ago

question mark
The length of a massless rod is measured using vernier callipers having 10 vernier scale divisions and least count of 0.1 mm. Two masses 1.00 ± 0.01 kg and 4.00 ± 0.02 kg are attached to its ends. If reading of vernier scale is 5 divisions coinciding with 1.3 cm, what is the % error in locating centre of mass from lighter mass
general physics
2 Answers Available

Last Activity: 2 Years ago

question mark
A block is kept on x-y plane at a point (2m,3m). It is pushed with a force of magnitude 10 Ntowards point (5m,7m). The force can be represented as?
general physics
0 Answer Available

Last Activity: 2 Years ago

question mark
The phase of particle at t is 70°and another particle is at t is 790° what is wavelength if the distance between two particles is1 m
general physics
0 Answer Available

Last Activity: 2 Years ago