# Jat

Most popular questions and responses by Jat
1. ## 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

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

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
4. ## 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

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 (3i-4j). Find the velocity and displacement of the particle from its initial position after 4s.

asked on February 26, 2012
6. ## 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
7. ## 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
8. ## 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

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 north-east

asked on February 12, 2012
10. ## 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
11. ## Mechanics for A-level?

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
12. ## 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

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

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
15. ## 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

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
17. ## 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

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
1. ## Mechanics M1

thanks a lot Elena, your help is much appreciated

posted on April 29, 2012
2. ## 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 =(F-opposing forces). Since they are unbalanced and acceleration A results: netF =

posted on April 29, 2012
3. ## Mechanics problem - Newtons laws - resultant force

Let F-Raoul 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. F-Raoul Cos(40º) = 400 N * Cos(60º) ------> F-Raoul = 261 N Nett force in

posted on April 25, 2012
4. ## 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