A big lump of meat of mass 5kg is hung from a spring balance in an elevator, find the reading of the balance (I)the elevator is moving with a steady speed.(ii)the elevator is moving upwards with acceleration of 0.2m/s(g=10m/s)

Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk,in meters?

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?