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How to read log & anti log table??????

what is triangle law of vector addition

a girl walks to her school at a distance of 1 km with a speed of 2km/hr and comes back with a speed of 3 km/hr. calculate the average speed for the round trip in km/hr.

what is polar vector and axial vector?

the speed of a projectile when it is at its greatest height is root(2/5) times its speed at half the max height . what is the angle of projection ?

Define centripetal acceleration. Derive an expression for the centripetal acceleration of a particle moving with uniform speed v along a circular path of radius r.discuss the direction of this acceleration{urgently} expert answer only

Derive relation between linear velocity and angular velocity

How collinear vectors can be parallel?two forces P and Q act at a point and have resultant R. if Q is replaced by (R^2 - P^2) /Q acting in the direction opposit to Q then the resultant --

A)remains same

B)becomes half

C)becomes twice

D) None of these

plese do not thing that i am testing the experts. i really dont know how to do it.

how to use a log book to find natural sines and natural cos ?

is electric current a scalar or a vector quantity?give reasons.

The relation between time(t) and distance(x) is t=Ax^2 + Bx, A and B are constants. Prove that its retardation is 2Av^3.

A) 30

B) 10

C) 20

D) 12

A person moves 30m north then 20m east and finally 30 root 2 m south west .find the displacement from original position

Angle between two vectors of equal magnitude is 120 degrees . prove that the magnitude of their resultant is equal to either of them.

The resultant of two vectors A and B is perpendicular to vector A and its magnitude is equal to half the magnitude of vector B ,Find the angle between A and B?

A particle is moving along a circular path of radius 5m with a uniform speed of 5m/s. What will be the average acceleration when the particle completes the half revolution? (Ans : 10/pi m/s)

A river 1 km wide is flowing at 3 km/h . A swimmer whose velocity in still water is 4 km/h can swim only for 15 minutes.In what direction should he strike out in order reach the other bank ? What is the total distance covered ?

A particle is projected vertically upwards from point A on the ground. It takes t1 time to reach a point B but it still continues to move up. If it takes further t2 time to reach the ground from point B then height of point B from the ground is :A) 1/2*g*(t_{1}+t_{2})^{2}B) gt_{1}t_{2}C) 1/2*g*(t

_{1}+ t_{2})^{2}D) 1/2*g*t_{1}t_{2}Xplain the solution.........A particle is subjected to two equal forces along two different directions. If one of them is halved, the angle which the resultant makes with the other is also halved, The angle between the forces is halved. The angle between the forces is ?

define positive,negative and zero work with examples

two forces A and B have resultant R1 ,if B is doubled the resultant R2 is at right angle to A then

a)R1=A

b)R1=B

c)R2=A

d)R2=B

satae and explain polygon law of vectors

The velocity of a particle moving in straight line depends on its position as v= 3sin [(pi /2) + x ] m/s. Find the acceleration of the particle when at x = pi / 4. (Ans : -9/2 m/s)

Can you prove that path of a projectile is a parabola....???

THE DIAGONALS OF A PARALLELOGRAM ARE REPRESENTED BY VECTORS P=5i-4j+3k and q=3i+2j-k.

THE AREA OF THE PARALLELOGRAM IS?

2. Two vectors, both equal in magnitude, have their resultant equal in magnitude of the either. Find the angle between the two vectors.

OR

Two equal forces have their resultant equal to either, what is the inclination between them?

Which of the following pairs of displacements cannot be added to give a resultant displacement of 2m?

1. 1m+1m

2. 1m+2m

3. 1m+3m

4. 1m+4m

(a) Find the horizontal speed with which the particle was projected

(b) Find the length OB along the inclined plane

(c) Speed at point B will be

A cricketer can throw a ball to a maximum horizontal distance of 100m. How much high above the ground can the crickter throw the same ball?

find the magnitude and direction of the resultant of two vectors A and B in terms of their magnitudes and angle

Obetween them..a projectile is thrown horizontally from top of a tower strikes the ground after 3sec at an angle 45

^{0}with horizontal.find height of tower and speed which body was projected.{g=9.8m/s^{2}}Two forces acting on a particle in opposite directions have the resultant of 10N. If they act at right angles to each other, the resultant it 50N. Fing the 2 forces.

a motor boat is racing towards north at 25km/h & the water current in tht region is 10 km/h in d direction of 60 degree east of south . find d resultant velocity of boat ............

my question is how do we know frm where we have to take angle ......... plzzz xplain me ... i hv xam tomorrow.......

A particle possesses two velocities at the same time one 4 m/s due south and other the 2√2 m/s due north- east. Find the magnitude and direction of resultant velocity.

the ceiling of a long hall is 25 m high . what is the maximum horizontal distance that a ball thrown with a speed of 40 m/s can go without hitting the ceiling of the hall ?

A man can swim in still water at a speed of 3km/h . He wants to cross a river that flows at a speed of 2 km/h and reach a point directly opposite to the starting point.

1. In what direction should he try to swim ?

2. How much time will he take to cross the river if the river is 500 m wide ?

Rain is falling vertically with a speed of 35m/s . winds starts blowing after sometime with a speed of 12m/s in east to west direction . In which direction . In which direction should a boy waiting at a bus stop hold his umbrella ? this question was answered wrong by an expert i need d correct answer and explanaton for this :(

Any Vector

Ais given byA= xi + yj. The another vectorBperpendicular toAcan be written asOne second after projection a stone moves at an angle of 45 degree with the horizontal. Two seconds after projection it moves horizontally .Then what is the angle of projection of the projectile?

Q. Four particles A, B, C and D are moving with constant speed v each. At the instant shown relative velocity of A with respect to B, C and D are in directions

Solve it. Answer is 1.

show that path of a projectile is a parabola.

A particle starts rotating from rest and displaces according to the formula:θ= 3t

^{3}/20 - t^{2}/3. Calculate the angular velocity and angular acceleration at the end of 5 seconds.a projectile is fired horizontal with a speed 98m/s from the top of hill 490m height. find

express the magniyude of vector a x b in terms of scalar products.

Obtain the component of vector

A=2i+3jin the direction of vectori+j.the motion of particle along a straight line is described by the equation x=6+4t

^{2}-t^{4}.where x is in meters and t is in seconds. find the position, velocity and acceleration of the particle at t=2seconds...please help..

if vector r1= 4m along north east and r2 vector = 2m due north, find vector mgnitude r1 + r2 and r1 - r2.

Three forces F1, F2 and F3 are acting on a partcle such that the particle remains in equilibrium. If F1 = (2i +3j) N and F2 = (2j + 2k) N find F3

add a force of 8N directed northwards to a force of 6N directed westwardsand .Calculate the magnitude and the direction of resultant with north

A hiker stands on the edge of a cliff 490 m above the ground and throws a stone horizontally with an initial velocity of 15 m/s.Neglecting air resistence,find the time taken by the stone to reach the ground and the speed with which it hits the ground.(g=9.8 m/s).Please provide the answer for this question.

^{2 }perpendicular to the initial motion. What is its displacement after 2 seconds?Prove that the maximum horizontal range is 4 times the max height attained by the projectile fired at an inclination so as to have maximum horizontal range

the equation of projectile is y = ax - bx2 . its horizontal range is?

_{1}.The maximum horizontal distance of Ram from the building where Shyam can throw a ball at Ram is d_{2}. If both of them can throw the ball with a velocity of $\sqrt{2gk}$, find $\frac{{d}_{1}}{{d}_{2}}$. Neglect the height of each person.(1) $\sqrt{\frac{k+h}{k-h}}$ (2) $\sqrt{\frac{k-h}{k+h}}$

(3) $2\sqrt{\frac{k+h}{k-h}}$ (4) $2\sqrt{\frac{k-h}{k+h}}$

A projectile is thrown into space so as tohave a max. possible horizontal range of 400mts. Taking the point of projection as the origin, the co-ordinates of the point where the velocity of the projectile is minimum are? can you show how to solve it?

Q. A child pulls a rope attached to a stone with a force of 60N. the rope makes an angle of 40 degree to the ground.

a) calculate the effective value of the pull tending to move the stone along the ground.

b) Calculate the force tending to lift the stone vertically.

( plss help me in this question with a diagram)

An object is projected with velocity v

_{0}=15i^ +20j^. Considering x along horizontal axis and y along vertical axis. Find its velocity after 2 seonds.If A=3i+4j and B=7i+24j then find the vector having the same magnitude as B and same direction as A.

r=3t i +2t^{2}J +5k , where t is in second and the coefficients have the proper units forrto be in metre. Find the magnitude and direction of the velocity of the particle at t=3s.a body thrown vertically up with initial velocity 52 m/sec from the ground passes twice a point at H height above at an interval of 10 s . The height H is (Take g= 10)

Two particles A and B start moving with velocities 20m/s and 30√2m/s along x-axis and at an angle of 45 degree with x-axis respectively in xy - plane from origin. what is the relative velocity of B w.r.t A ?

a)Draw the vertical and horizontal components of tension (T) in the rope.

b)Find the effective force pulling the trolley along the ground.

c)Find the force tending to lift the trolley off the ground.

two paper screens A and B Are seperated by a distance of 100m. A gullet penetrates A and B at points P AND Q respectively. Where Q is 10 cm below P. If bullet is travelling horizontally at the time of hitting A the velocity of bullet ar A is nearly how much?Help experts

a PARTICLE IS PROJECTED FROM GROUND WITH SPEED 80 m/s AT AN ANGLE 30 DEGREE WITH HORIZONTAL FROM GROUND .THE MAG NITUDE OF AVERAGE VELOCITY OF PARTICLE IN TIME T=2SEC TO T=6SECS IS?

if vectors are A= i+j+k and vector B = -i-j-k,then find the angle between vector (A - B) and A.

A particle starts from origin t=0 with a velocity 5.0 ^i m/s and moves in x-y plane under action of a force which produces a constant acceleration of (3.0 ^i + 2.0^j) m/s squ.

a) What is the y coordinate of the particle at the instant its x coordinate is 84m?

b)What is the speed of the particle at this time?

Please help! :o

If (v

_{1}+v_{2}) is perpendicular to (v_{1}-v_{2}),then is v_{1}perpendicular to v_{2}, is v_{1}=v_{2}, is v_{1}a null vector,can the angle between v_{1}and v have any value?If vector A and B are two non collinear unit vectors and if |A+B|=, then find the value of (A-B).(2A+B)

Please help! :O

P+Q=RandRis perpendicular toP. If |P|=|R| , then what is the angle betweenPandQ?- pi/4
- pi/2
- 3pi/4
- pi

WhereP,QandRare vectors.A PROJECTILE IS PROJECTED WITH A VELOCITY u SO THAT ITS HORIZONTAL RANGE IS TWICE THE GREATEST HEIGHT ATTAINED.FIND THE HORIZONTAL RANGE OF IT

if two vectiors of magnitudeof 5 and 3 are added such that angle between resultant and vector of magnitude 3 is maximum and it will be.

a river is flowing from west to east at speed 5m/min. a man on the south bank of river, capable of swimming at 10m/ min in still water wants to swim across the river to a point directly opposite in shortest time. what direction shoukd he swim in?

can u plz explain the meaning of this problem with the help of a diagram. n wt is rele to be found out.?i need this soon plz.

(ii) (2i - j ). (3i+ k)

in a car race, car A takes a tym t sec less than the car B and passes the finishing part with a velocity v more than that of the car B .if the cars start from rest and travel with constant accleration A1 and A2 respectively. show that V = T * root over of A1* A2.

how do u calculate the value of tan inverse ??

i just dont get it . ?

plz help me....

write the dimensions of a/b in the relation F=a root x +bt

^{2}where F is force , x is distance and t is time.Given A=i+j+k and B=-i-j-k, then (A-B) will make what angle with A