Mechanics | Relativity Answers

the gravitation field in a region is given by g=2i+3j m/s2. The work done in moving a particle of mass=1Kg from (1,1) to (2,1/3) along line 3y+2x=s is
a)zero
b)20J
c)-15J
d)18J

two masses m1=2kg and m2=8kg infinite distance apart are initially at rest . under their mutual grav attaraction they start moving. When separation becomes 1m , velocity of m2 will be???
ans in terms of G?

a long wire hangs vertically with its upper end clamped. a torque of 6 Nm is applied to free end twist it through 60 dgree . the potential energy of twisted wire is??
ans in terms of pi..

A stones hangs from the free end of a sonometer wire whose vibrating length when tuned to a tunning fork is 40 cm. When the stone hangs wholly immersed in water , the resonant length is reduced to 30 cm .The relative density of the stone is

A QUARTER HORSEPOWER MOTOR RUNS AT A SPEED OF 600 RPM. ASSUMING 40 % EFFICIENCY THE WORK DONE BY THE MOTOR IN ONE ROTATION WILL BE ?

A wire suspended vertically from one end is stretched by attaching a weight of 20 N to the lower end. The weight stretches the wire by 1mm .How much energy is gained by the wire

A body is released from a height equal to the radius R of the earth . The velocity of the body when it strikes the surface of the earth will be

A solid cylinder of mass 2 kg and radius 20cm is rotating about its axis with a frequency of 10 Hz. What is the rotational kinetic energy of the cylinder

An observer moves towards a stationary source of sound with a velocity one tenth the velocity of sound.The apparent increase in frequency is

A wire suspended vertically from one end is stretched by attaching a weight of 20 N to the lower end. The weight stretches the wire by 1mm .How much energy is gained by the wire