N bullets each of mass m ,kg are fired with a velocity v,m{s^{

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4-1.Newton's Laws of Motion

easy

$N$ bullets each of mass $m \,kg$ are fired with a velocity $v\,m{s^{ - 1}}$ at the rate of n bullets per second upon a wall. The reaction offered by the wall to the bullets is given by

A$nmv$

B$\frac{{Nmv}}{n}$

C$n\frac{{Nm}}{v}$

D$n\frac{{Nv}}{m}$

Solution

(a) Total mass of bullets $= Nm$, time $t = \frac{N}{n}$
Momentum of the bullets striking the wall $= Nmv$
Rate of change of momentum (Force) = $\frac{{Nmv}}{t} = nmv.$

Standard 11

Physics

A machine gun fires a bullet of mass $40\, g$ with a velocity $1200\, ms^{-1}$. The man holding it, can exert maximum force of $144\, N$ on the gun. How many bullets can he fire per second at the most ?

easy

In doubling the mass and acceleration of the mass, the force acting on the mass with respect to the previous value

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A force of $100 \,dynes$ acts on a mass of $5\, gram$ for $10\, sec$. The velocity produced is ……… $cm/sec$

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medium

From the following graph find the magnitude of negative force ………… $N$

medium

$N$ bullets each of mass $m \,kg$ are fired with a velocity $v\,m{s^{ - 1}}$ at the rate of n bullets per second upon a wall. The reaction offered by the wall to the bullets is given by

Solution

Similar Questions

A machine gun fires a bullet of mass $40\, g$ with a velocity $1200\, ms^{-1}$. The man holding it, can exert maximum force of $144\, N$ on the gun. How many bullets can he fire per second at the most ?

In doubling the mass and acceleration of the mass, the force acting on the mass with respect to the previous value

A force of $100 \,dynes$ acts on a mass of $5\, gram$ for $10\, sec$. The velocity produced is ……… $cm/sec$

A body of mass $2 \,kg$ has an initial velocity of $3\, meters$ per second along $OE$ and it is subjected to a force of $4 \,N$ in a direction perpendicular to $OE$. The distance of the body from $O$ after $4$ seconds will be ……….. $m$

From the following graph find the magnitude of negative force ………… $N$

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