Mechanics | Relativity Answers

Do all type of electromagnetic waves propagate with same speed?What is the phase difference between electric field and magnetic field vibrations?Does the direction of electromagnetic wave propagation same as the direction of vibration of electromagnetic waves?

two isolated point masses m and M are separated by a distance l.The moment of inertia of the system about an axis passing through a point where gravitational field is zero and perpendicular to the line joining the two masses,is

hello my question is about mechanics i think!


A tanker full of a liquid, is static on a straight road with no friction. Outlet pipe of the tanker is on down and corner of it and Its closed by a stopper.
Describe movement (motion) of tanker after we suddenly open the outlet pipe!

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why we use earth's density while find time period??? plz send me its answer

A box of mass 27 kg slides down a 14o slope with a coefficient of friction of 0.16.
a)the weight of the box
b) the normal force on the box
c) the frictional force on the box
d) the total force on the box

A truck is traveling at 14.6 m/s down a hill when the brakes on all four wheels lock. The hill makes an angle of 18 ° with respect to the horizontal. The coefficient of kinetic friction between the tires and the road is 0.915. How far does the truck skid before coming to a stop?

.what will be the escape speed from earth if the mass of earthis doubled keeping the same size

THE TENSION IN A WIRE 80CM LONG IS 5KGWT. WHAT CHANGE MUST BE DONE IN ORDER TO RAISE THE PITCH BY ONE OCTAVE ,IF THE TENSION IS INCREASED TO 7.2KGWT. ?

A 2.00kg block is pushed against a spring with negligible mass and force constant k=400N/m, compressing it 0.200m. When the block is released, it moves along a frictionless, horizontal surface and then up a frictionless incline with the slope 37.0o. (fig 3)
What is the speed of the block as it slides along the horizontal surface after having left the spring?
How far does the block travel up the incline before starting to slide back down?

A 370 N force is pulling an 85.1-kg refrigerator across a horizontal surface. The force acts at an angle of 22.0 ° above the surface. The coefficient of kinetic friction is 0.237, and the refrigerator moves a distance of 9.44 m. Find (a) the work done by the pulling force, and (b) the work done by the kinetic frictional force.