help@askiitians.com

+91-87964 74404

Grade 11Mechanics

In a gravity free space, a man of mass M standing at a height h above the floor, throws a ball of mass m straight down with velocity u. When the ball reaches the floor, the distance of the man above the floor will be??

Arin Som

9 Years agoGrade 11

1 Answer

DR STRANGE

Approved Tutor Answer9 Years ago

HI ARIN,

this is the concept of center of mass

initially the center of mass of them is at height h above the floor, after he he throws the ball the center mass should remain stationary.

let the distance of the man from th floor as ball reaches the floor be h+x (DISTANCE BETWEEN MAN AND THE BALL)

the distance of center of mass from the ball at floor is h.

mathematically, $M\times \frac{h+x}{M+m} = h$

solve it for x, $x=\frac{hm}{M}$

distance of the man above the floor will be h+x (just add them)

I hope you will get it

plz approve if you are satisfied :)

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