a man counts 6 waves on a pond in 10 seconds. the distance between them is 40 cm. what is their speed?
1 answer:
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As we know that here no air resistance while ball is moving in air
So here we will say that
initial total energy = final total energy
here we know that
(as it will be on ground at initial and final position)
so we will say
since mass is always conserved
so we will say that final speed of the ball must be equal to the initial speed of the ball
so we have
Answer:
option C
Explanation:
Let mass of the bullet be m and velocity be v
mass of gun be M and bullet be V
now,
using conservation of momentum for gun 1
(M+m) V' = 2 mv + 3 MV
V' = 0
3 M V = - 2 mv
momentum of gun 1 =- 2 mv---------(1)
now for gun 2
(M+m) V' = mv + MV
V' = 0
M V = - mv
momentum of gun 1 = -mv-----------(2)
dividing equation (1) by (2)
the correct answer is option C
Answer:
Explanation:
From the question we are told that
Velocity of aircraft
Engine air intake rate
Fuel burn rate
Velocity of exhaust gas
Generally the Mass change rate of Rocket is mathematically given by
Generally the Trust of the rocket is given mathematically by
Generally the Rocket's delivered power is mathematically given by
Delivered power P