This discussion is closed.
devesh254
Badges: 0
#1
Report Thread starter 14 years ago
#1
A particle of mass 0.5kg is at rest on a horizontal table. It receives a blow of impulse 2.5Ns.

(a) Calculate the speed with which P is moving immediately after the blow

The height of the tablke is 0.9m and the floor is horizontal. In an initial model of the istuation the table is assumed to be smoth.

(b) Calculate the horizontal distance from the egde of the table to the point where P hits the ground.

In a refinement of the model the table is assumed rough. The coefficient of friction between the table and P is 0.2.

(c) Calculate the deacceleration of P.

Given thatP travels 0.4m to the edge of the table,

(d) calculate the time which elapses between P receiving the blow to P hitting the floor.


am having problems with (d), have done (a) to (c)

answers:
(a) 5 ms^-1
(b) 2 1/7 m
(c) 1.96 ms^-2
(d) 0.510s

THANX!
0
dvs
Badges: 10
Rep:
?
#2
Report 14 years ago
#2
On the table:
S=ut+0.5at²
0.4=5t-0.98t²
Using the quadratic formula:
t=0.081s until P leaves the table.

Vertical projectile motion:
S=ut+0.5ut² => -0.9=-4.9t² => t=3/7 s when P strikes the ground.

Add them up:
t = 3/7 + 0.081 = 5.10s
0
devesh254
Badges: 0
#3
Report Thread starter 14 years ago
#3
cheers mate....
0
X
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Cardiff Metropolitan University
    Undergraduate Open Day - Llandaff Campus Undergraduate
    Sat, 19 Oct '19
  • Coventry University
    Undergraduate Open Day Undergraduate
    Sat, 19 Oct '19
  • University of Birmingham
    Undergraduate Open Day Undergraduate
    Sat, 19 Oct '19

Why wouldn't you turn to teachers if you were being bullied?

They might tell my parents (23)
6.74%
They might tell the bully (33)
9.68%
I don't think they'd understand (52)
15.25%
It might lead to more bullying (131)
38.42%
There's nothing they could do (102)
29.91%

Watched Threads

View All