All Mechanics DOUBTS HERE!!!

[dk bose]

here is one more sum.its 4m the same textbook.page no 59.Review exercise 1.question no 21.the question is as follows - The diagram shows the speed time graph for the motion of a car which is moving with constant acceleration in a straight line.The car passes a point A with speed um/s and 10s later,it passes a point B with speed 30m/s.(a) State,in terms of u,the speed of the car at the end of the first 5s.During the first 5s the car travels 127.5m.(b) Calculate the value of u. (c) Find,in m s^-2,the magnitude of the acceleration of the car.

[astarmathsandphysics]

When I get home.

[astarmathsandphysics]

Here it is

[dk bose]

here i have got another sum.its 4m the sanme txtbuk.page no 147.question no 15 .the question is as follows-
Two particles A and B of mass 8kg and 10 kg respectively,are connected by a light inextensible string which passes over a light smooth pulley P.Particle B rests on a smooth horizontal table and particle A rests on a smooth plane inclined at 30⁰ to the horizontal with the string taut and perpendicular to the line of intersection of the table and the plane as shown in the attachment.
(a) Find the magnitude of the acceleration of particle B.
(b) Find, in newtons,the tension in the string.
(c) Find the distance covered by B in the first two seconds of motion,given B does not reach the pulley.

[astarmathsandphysics]

One mo

[astarmathsandphysics]

here

[dk bose]

one more doubt.its 4m the same textbook.page no 60.q no 22.the question is as follows-
A train starts from rest at a station,accelerates uniformly to its maximum speed 15m/s,travels at this speed for a time,and then decelerates uniformly to rest at the next station.the distance from station to station is 1260m,and the time spent is three-quarters of the total journey time.
(a)iilustrate this information on a velocity time graph.
(b) By using this graph,or otherwise find the total journey time.
(c) Given also that the magnitude of the deceleration is twice the magnitude of the acceleration find in m s^-2,the magnitude of the acceleration.

[dk bose]

one more doubt-.
A particle A is constructed to move in a straight line. it starts from rest at X and accelerates at 2m s^-2 until it reaches speed V.it then travels with constant speed V for 60s before decelerating at 1 ms^-2 to come to rest at Y.The total time for the motion is 105s.Find the distance XY.

[dk bose]

can anyone plzzzzzz solve my sums and give me the solution as fast as possible?? itzzzzzzzzzzz urgent!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[astarmathsandphysics]

here.

[dk bose]

hey i have given two sums!!!! the first one is at the end of page 29 of this topic!!!!try to solve and give me the solutions as fast as possible.!!!!!!!!!!!

[astarmathsandphysics]

The train question

[curiousguy]

9709/41/O/N/09  Q.6 (iii)  and 9709/42/O/N/09 Q.6 ( ii & iii) Please could any one explain these to me.

[astarmathsandphysics]

tonight

[dk bose]

one more sum.the question is as follows-
A particle starting from rest at time t=0 moves is a straight line and accelerates in the following way:

a=3 when 0<t<20

a=1 when 20<t<50

a=-2 when 50<t<95

where a is the acceleration in m s^-2 and t is in seconds.Find the speed of the particle when t=20,t=50 and t=95.Sketch a time-speed graph for the particle int the interval 0<t<95.Find the total distance travelled bt the particle in this interval.