Grade 12th PassMechanics

A bullet loses 1/10 th of its velocity when it passes through a plank.Then the max. no. of planks through which it can pass

a.9

b.10

c.5

d.6

Menka Malguri

14 Years agoGrade 12th Pass

2 Answers

Abhay Mishra

14 Years ago

initial vel. and accln. is not given is not given.........

although takinf v=100 initially the ans would be 9.....

Subodh kumar

7 Years ago

From work energy theorem

Wfr= ΔK.E

-frx=1/2m [9v•2/10]-10/2mv•2

-frx=1/2mv•2(81/100-1)

-frx= 1/2mv•2(-19/100)___(i)

Assume bullet cross a no.of blocks

W.E= -nfr•x=Kf-Ki

= -nfr•x = 0-1/2mv•2

= n*1/2mv•2*19/100=1/2mv•2

n= 100/19= 5.2. Answer...

So bullet will cross = 5 blocks.... Ans..

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

mechanics

1 Answer Available

Last Activity: 10 Months ago

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

11
21
31
41

mechanics

1 Answer Available

Last Activity: 10 Months ago

A metal strip clamped at one end vibrates with a frequency of 20 Hz and amplitude of 5 mm
at the free end, where a small mass of 2 g is positioned. determine
(i) The velocity of the end when passing through the zero position
(ii) The acceleration at maximum displacement
(iii) The maximum kinetic energy of the mass

mechanics

2 Answers Available

Last Activity: 3 Years ago

An object of mass m = 0.25 kg oscillates in a fluid at the end of a vertical spring of spring
constant kH = 85 N/m, see Fig.1. The effect of the fluid resistance is governed by the
damping constant b = 0.07kg/s.
(i) Find the period of the damped oscillation.
(ii) By what percentage does the amplitude of the oscillation decrease in each cycle?

mechanics

1 Answer Available

Last Activity: 3 Years ago

If a=x² find the displacement at t =3sec if body velocity at t= 0 sec is 0

mechanics

1 Answer Available

Last Activity: 3 Years ago

View all Questions

A bullet loses 1/10 th of its velocity when it passes through a plank.Then the max. no. of planks through which it can pass a.9 b.10 c.5 d.6

Menka Malguri

2 Answers

Abhay Mishra

Subodh kumar

Other Related Questions on mechanics

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.11213141

If a=x² find the displacement at t =3sec if body velocity at t= 0 sec is 0

A bullet loses 1/10 th of its velocity when it passes through a plank.Then the max. no. of planks through which it can pass

a.9

b.10

c.5

d.6

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

11
21
31
41