jat
Most popular questions and responses by jat
Advanced Maths (Vectors) AQA Level
A boat which can travel at 5m/s in still water is crossing a river 200 m wide.the rate of the flow of the river is 2 m/s assumed uniform at every point in the river. Point A and B are directly opposite to each other across the river. a) If the boat leaves
asked on February 21, 2012 
Advanced Maths (Vectors) AQA Level, please help?
A boat which can travel at 5m/s in still water is crossing a river 200 m wide.the rate of the flow of the river is 2 m/s assumed uniform at every point in the river. Point A and B are directly opposite to each other across the river. a) If the boat leaves
asked on February 12, 2012 
Advanced Maths (Vectors) AQA Level, please help?
An aircraft have a speed in still air of 400 km/h. A wind is blowing from the south at 80 km/h. The pilot wishes the aircraft to travel due east. Find the direction in which aircraft should be steered and the speed at which it will travel.
asked on February 12, 2012 
Mechanics AQA igher
A ship is being steered due east. A current is flowing from north to south, so that the actual velocity of the ship is 12 km/h on a bearing of 120 degree . Find the speed of the current and still water speed of the ship
asked on February 1, 2012 
Please help me with M1 kinematics!
A particle is travelling with velocity (4i+5j)m/s. It undergoes an acceleration of magnitude 2.5m/s^2 in a direction given by the vector (3i4j). Find the velocity and displacement of the particle from its initial position after 4s.
asked on February 26, 2012 
Mechanics AS (Vectors)
When Studying Vectors, How Would I Go About Answering This Question? In Each of the following Cases, find the magnitude and direction of the resultant vectors of the two given vectors: a) a displacement of magnitude 26km on a bearing of 175 degrees and a
asked on February 21, 2012 
Advanced Maths (Vectors) AQA Level
Triangle ABC with D, E and F the midpoints of BC, AC, and AB. G is the midpoint of AD such that the ratio AG:GD =2:1, VECtors AB =p and BC =q Prove that B, G and E are collinear. prove the same results for point C, G and G
asked on February 12, 2012 
Mechanics M1
Q.1 Find the force needed to accelerate a 2 kg block at 3m/s^2 up a rough plane (coefficient of friction 0.2) inclined at 25 degree to the horizontal if the force is a) Parallel to the slope b) horizontal c) at 45 degree to the upward verticle
asked on April 29, 2012 
Advanced Maths (Vectors) AQA Level, please help?
Two ships, A and B st out from port O simultaneously. A travels due north at 16 km/h, B due east at 13 km/h. The ships radio have a rang of 120. For how long would they remain in contact if B had travelled northeast
asked on February 12, 2012 
Mechanics (M1) A level?
A block moves on a rough slope of length 10 m inclined at 30 degrees to the horizontal. The coefficiebt of friction between the block and the slope is 0.4. The block starts from rest at the top of the slope. a) Find the speed at which the block reaches the
asked on April 29, 2012 
Mechanics for Alevel?
A particle of mass m can just rest on a rough plane inclined at 30 degree to the horizontal without slipping down. show that the least horizontal force needed to maintain its position if the inclination is increased to 45 degree is 0.268mg.
asked on April 7, 2012 
Mechanics M1
A child is splaying with a toy aero plane. the aero plane is flying with velocity (6i + 2j)m/s. A breeze begin to blow with velocity 0.5j m/s affecting the motion of the aero plane. a) find the magnitude of the resultant velocity of the plane b) find the
asked on March 6, 2012 
Advanced Maths (Vectors) AQA Level, please help
An aircraft is traveling horizontally in an easterly direction at a height of 400 m above level ground and at a speed of 120 m/s. when it is directly above the observer, M, it releases a package. In relation to origin O and to x and y directions of east
asked on February 26, 2012 
Advanced Maths (Vectors) AQA Level, please help?
Starting simultaneously from the same spot, O, Alvin and Bernard set out across a field in the gog. Alvin travels with velocity i + 2 j m/s and Bernard with velocity 3i + j m/s, To avoid losing each other, they hold opposite ends of 90 m string. a) At what
asked on February 16, 2012 
Advanced Maths (Vectors) AQA Level
Triangle ABC with D, E and F the midpoints of BC, AC, and AB. G is the midpoint of AD such that the ratio AG:GD =2:1, VECtors AB =p and BC =q Prove that B, G and E are collinear. prove the same results for point C, G and F
asked on February 12, 2012 
Advanced Maths (Vectors) AQA Level, please help?
An object is moving in a plane. At time t =0,it is at origin O, and moving with velocity u. After 2 seconds, it is at A, where OA = 2i  4j. After 3 seconds, it is at B, where AB= 10i 40 j. Show that this is consistent with constant acceleration a. Find
asked on February 26, 2012 
M1 mechanics
A particle of mass 5 kg is being towed at a constant speed of 6 m/s on a rough horizontal plane with coefficient of friction 0.2. At a certain point the towing force is reversed in direction. Find the distance that the particle will travel before coming to
asked on April 30, 2012 
Please help me with M1 kinematics!
A particle p is initially at the point (2, 6) in relation to an origin O, and is moving with velocity (3i + j) m/s. It has a constant acceleration (16i + 24j)m/s^2. Show that after 2 seconds it is moving directly away from O and find its speed at that time
asked on February 26, 2012

Mechanics M1
thanks a lot Elena, your help is much appreciated
posted on April 29, 2012 
Mechanics M1
First force is F which is pushing block upward Second is the opposing forces, opposite to F The block accelerates, so there is a net force (UNbalanced forces) which is net F =(Fopposing forces). Since they are unbalanced and acceleration A results: netF =
posted on April 29, 2012 
Mechanics problem  Newtons laws  resultant force
Let FRaoul be the force exerted by Raoul. Consider the direction perpendicular to Rory's direction, There is no nett force in that direction as there is no movement along it. FRaoul Cos(40º) = 400 N * Cos(60º) > FRaoul = 261 N Nett force in
posted on April 25, 2012 
Advanced Maths (Vectors) AQA Level
a)by Phythagorous c^2 =a^2 + b^2 = 5^2+ 2^2=25+4=29 c=5.38m/s b)sin (theta)=2/5 theta = sin^1 (2/5) theta=23.57 degree
posted on February 27, 2012 
Please help me with M1 kinematics!
In the direction of x u = 4i, a= 2.5(3/5) At t =4 v = u+at v= 4 + 2.5 (3/5)4=4+6=10 In the direction of y u = 5j, a= 2.5(4/5) At t =4 v = u+at v= 5 + 2.5 (4/5)4=58=3 Hence V = 10i3j Now we have initial and final velocities r = 1/2(u +v)t r =
posted on February 26, 2012