Recently Active Mechanics Questions

Q1. is [dv/dt]=[dv]/dt Q2. is it possible to have [dv/dt]=0 but [dv]/dt ≠0 give reasons for your answer [] denotes modulas of the function ...

a uniform chain of mass M and length L is held vertically in such a way that ts lower end just touches the horizontal floor. The chain is released from rest in this postion. Any portion that strikes the floor comes to rest. A ...

*Image* a projectile is fired from the edge of a 150 m cliff with a horizontal velocity of 180m/s at angle of 30° with the horizontal , negelcting air resistane ans the followin 1.the horizontal distance from the gun to the ...

The density of liquid varies as ρ=ρo(4- 3h/ho). Here ho and ρo are constants and h is measured from base of container.A solid block of small dimensions whose density is 5ρo/2 and mass is m is released from bottom of tank. ...

A person A at x=0 is shooting bullets along positive x axis at a speed of 100m/s at the rate of 100 bullets per second. A cart is moving along the x axis with a speed of 4m/s. Find the number of stones gathered by the person ...

A point moves along a circle with its tangential velocity vt=0.50 m/s2 .Find the total acceleration of the point at the moment when it covered the n-th(n=0.10) fraction of the circle after the begining of the motion? ...

a cubical block of wood of edge 3cm floats in water.The lower surface of cube just touches the free end of a vertical spring fixed at the bottom of pot.Find max weight that can be put on the block without wetting it.Density o ...

There is an air bubble of radius 1mm in liquid of ST=0.075 N/m and density 1000 kg/m3 .The bubble is at the depth 10cm below free surface.By what amount is the pressure inside bubble greater than the atmospheric pressure? ...

A tube of insufficient length is immersed in water(ST=0.07 N/m) with 1cm of it projecting vertically upward outside the water.What is radius of meniscus?Radius of tube=1 mm ...

*Image* pls solve this beginners ...

A hoop of radius r rolls over a horizontal plane with constant velocity v without slipping. The velocity of any point on the hoop t seconds after it passes the top position is ...

Q1 Four persons K, L, M, N are initially at the four corners of a square of side d. Each person now moves with a uniform speed v in such a way that K always moves directly towards N and N directly towards K. The four persons ...

*Image* two particles from A & B start traveling simultaneously towards each other ,both of them with speed u.find their separation after time t=R/u. 2.What will be their initial velocities when both particles have rotated th ...

A motor drives a body along a straight line with a constant force. The power P developed by the motor must vary with time t according to ...

A boat floating in fresh water displaces 35.6 kN of water. What weight of water would this boat displace if it were floating in salt-water of density 1024 kg m-3? ...

what is newtons law ...

Ques) A block is kept on a smooth inclined plane of angle of projection θ that moves with constant acceleration so that block does not slide relative to the inclined plane. If the inclined palne stops, then show that the nor ...

the figure shows a small square box held with a person's fingers pushing downwards one quarter of the way along the top of the box and the thumb pushing sidewards on the bottom of the side face of the box. friction between th ...

*Image* initially the spring was highly compressed such that b1 almost touched b2.suddenly the compressing force was removed.find m such that b2 jumps from the ground.(assume spring constant to be k) ...

*Image* when the boxes are lifted though a distance x,find the normal force between them and their acceleration ...

a slender rod CD of length (l) and mass (m) is placed upright on a motionless horizontal surface . a second identical rod AB is moving along the surface with a velocity (vt) when its end B strikes squarely the end C of the ro ...

Consider this situation: A fixed pulley carries a weightless thread with masses m1 and m2 at its ends. There is friction between the thread and the pulley. How can there be friction when the thread is weightless?? where will ...

Q. A pendulum of mass m hangs from a support fixed to a trolley.The direction of the string (i.e θ) when the trolley rolls up a plane of inclination α with acceleration "a" is Q.A 50kg man is standing at one end of a 25m lo ...

A small mass is suspended by a strung from the ceiling of a car.As the car accelerates at a rate "a" the string makes an angle θ with the vertical then tension of string is ? ...

A block of mass 10kg lying on a smooth surface is being pulled by means of a rope of mass 2kg.If a force of 36N is applied at the end of the rope , the tension at the midpoint is ? What is the formula ? ...

A heavya point particle is suspended vertically from O by an inextensible string of length l.The string becomes slack at some angle and the particle proceeds on a parabola.Find the value of V0 if the particle passes through t ...

A 40 kg mass hanging at the end of a rope of length l oscillates in a vertical plane with an angular amplitude \theta _{0} . What is the tension in the rope, when it makes an angle \theta with the vertical ? If the breaking s ...

I am facing a lot of problems to solve problems related to RELATIVE MOTION in a projectile. Are there any special formula to solve these type of sums? One more question is there about projectile motion DOWN an inclined plane. ...

Q1) Four athletes are standing at the corners A,B,C and D of a square of side l.They simultaneously start running,such that A runs towards B,B runs towards C,C runs towards D and D runs towards A,each with velocity v.They wil ...

i was really confused abt work done by friction. 1)Some authors says dat it is just like a workdone by a conservative force so the expresion is Wfriction=Frictional force*displacement 2)Some says dat it depends on path so the ...