Mechanics | Relativity Answers

a body of mass m is kept on a rough horizontal surface of friction coefficient mue . a force is applied horizontally but the body is not moving. the net force F by the surface on the body will be?

how far will a car travel from a standing start if it accelerates at 4 meter per second square for 9 seconds?

A dolphin accelerates for 2.0 sec from an initial speed of 7.5 m/sec in order to take a look at a dolphin of the opposite sex.Calculate the dolphin's final speed if the deceleration had a magnitude of 1.5 m/square seconds.

a 10cm tube floats in water with height of 4cm remaining above the surface.what is the density of materials from which the cube is made?

U-shaped tube of cross sectional area of 2cm (squared) has an amount of water 9cm (cubed) of kerosene is poured in one limb & the level difference of water becomes 3.6 cm . find the volume of benzene to be poured in the other limb so that the water level in both limbs is the same ( water's density = 1000 , Benzene's density = 900)

two rods of equal mass m and length L lie along the x axis and y axis with their centres at the origin . what is the moment of inertia of both about the line x=y?

. A spring system with k = 2500 n?m is compressed for 0.5 m to be used in launching a 2 kg ball and make it roll horizontally on the ground where µ = 0.2 between the ball and the ground. The spring is stretched for 0.1 m when the ball is detached from the spring. For how many meters will the ball roll before coming to a stop?

1.Calculate the work done by a boy pushing a 20 kg load for 10 m along a horizontal track with frictional force of a 20 N if the load accelarates at 20 m/s.

Establish the differential equation for a damped oscillator. Show that, for weak damping,
the solution of the differential equation for the damped oscillator is given by
x(t) = a0 exp (−bt) cos (wd t + f)

Discuss the principle of superposition. Two collinear SHMs, with amplitudes 5 cm and
12 cm are superposed. Calculate the resultant amplitude when the SHMs differ in phase
by (i) 60°, (ii) 90° and (iii) 120°.