Physics Test 11...

If two numerically equal forces P & P acting at a point produce a resultant force of magnitude P itself, then the angle between the two original forces is

A physical quantity X is related to four observables a,b,c & d as follows X = a³b²/d√c. The percentage error of measurement in a,b,c and d are 1%,3%,4% & 2% respectively, the percentage error in the quantity X is

A particle moving in a straight line covers half the distance with speed of 3m/s. The other half of the distance is covered in two equal time intervals with speed of 4.5 m/s 7.5m/s respectively. The average speed of the particle during this motion is

A particle moves along a straight line such that its displacement at any time is given by s = t³ - 6t² + 3t + 4 meters. The velocity when the acceleration is zero is

Three blocks of masses M₁,M₂ & M₃ are connected by mass-less strings as shown on a friction-less table. They are pulled with a force T₃ = 40N. If M₁ = 10Kg, M₂ = 6Kg, M₃ = 4KKg then Tension T₂ will be:

The blocks of mass M₁ and M₂ are connected to each other through a light spring as shown in figure. If we push mass M₁ with a force of F and cause acceleration a in mass M₁, what will be the acceleration in M₂:

A balloon has 5gm of air. A small hole is pierced into it, the air escapes at a uniform rate with a velocity of 4cm/sec. If the balloon shrinks completely in 2.5 second, the mean force acting on the balloon is

Two skaters of masses 40 kg and 60 kg respectively stand facing each other at S1 and S2 where S1S2 is 5m. They pull on a massless rope stretched between them, then they meet at

A man sits on a chair supported by a rope passing over a friction less fixed pulley. The man who weights 1000N exerts a force of 450 N on the chair downwards while pulling on the rope. If the chair weight 250 N and g is 10 ms^-2, then the acceleration of the chair is

A block of mass 4 kg is suspended through two light spring balances A and B. Then A and B will read __respectively