0

Guest

Courses New

a disc of mass ten gram is kept horizontally in air by firing bullets of mass five g each at rate of ten per second.if the bullets rebound with same speed .The velicity with which bullets are fired is

a disc of mass ten gram is kept horizontally in air by firing bullets of mass five g each at rate of ten per second.if the bullets rebound with same speed .The velicity with which bullets are fired is

Grade:12

1 Answers

Arun
25750 Points
6 years ago
Dear student
 
force is 
F = change of momentum/ time = impulse/time 
the change of momentum of the bullet is 
impulse = vm - (- v)m = 2vm = 2v*0.005 kgm/s 
and assuming that the time of impact of 1 bullet is 0.1 second, then the force is 
F = 2v*0.005/0.1 N 
now set weight = Force to find v: 
0.01 kg * 9.81 m/s^2 = ( 2*0.0005 kg*/ 0.1 s) *v
v = 0.01*9.81*0.1/(2*0.005) 
v = 0.98 m/s (= 98 cm/s)

Regards
Arun (askIITians forum expert)

Think You Can Provide A Better Answer ?

Other Related Questions on Mechanics

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More