OHara
Popular questions and responses by OHara
physics
How is dust in operating theatres controlled?
asked on November 4, 2013 
Physics
A car of mass 550kg accelerates steadily from rest to 25m/s in 30s. a). What is its acceleration? b). What resultant force produces this acceleration? c). The actual force will be greater, why?
asked on June 7, 2013 
Physics
A student of mass 75kg stands in a lift, what is the normal reaction force(upward force) on him when the lift is accelerating: a). Upwards at 0.65m/s^2 ? b). Downwards at 0.65m/s^2 ?
asked on June 7, 2013 
Physics
A block measuring 0.1m x 0.4m x 1.5m has a mass of 30kg. Calculate the pressure in each position and state in which position will the block produce greatest and least pressure on the ground.
asked on June 7, 2013 
Physics  force and pressure
A force of 2000N acts on an area of 4m^2, what is the pressure? What would be the pressure if the same force acted on half the area?
asked on June 7, 2013 
Maths Factorising please help right now.
Factorise (x  1)^2  4y^2
asked on June 6, 2013 
Maths  factorising
Find the quotient and remainder in the following: a) x^4 +3x^3 + 5x^2  6x  8 is divided by x + 2
asked on June 5, 2013 
Math  Factorising
Find the quotient and the remainder in the following. a). x^4 + 3x^3 + 5x^2  6x  8 is divided by x + 2 b). 2x^4  3x^3 + 6x^2  5x  4 is divided by 2x  3 Please help, this is urgent. Thanks.
asked on June 5, 2013 
Science
A car of mass 1200kg accelerates from rest at a rate of 2m/s^2. Calculate how long it should take to reach a velocity of 50m/s.
asked on May 25, 2013

Physics
I think I have a little idea on Q.a) only. F = ma = 550 x 25 =13750N so acceleration is a = v  u/t =25  0/30 =0.83 ms^2 that's all i know. I don't know about Q.b and Q.c.
posted on June 7, 2013 
Maths Factorising please help right now.
Thanks guys:)
posted on June 6, 2013 
Math  Factorising
Thanks kuai.
posted on June 6, 2013 
Maths  factorising
Thanks mate.
posted on June 6, 2013 
Physics
Charles law can be written as: V1/T1 = V2/T2 (at constant pressure)
posted on May 31, 2013 
Science
Thanks Henry.
posted on May 31, 2013