A pendulum clock is in a lift that descends at a constant velocity. Does it keep correct time?

What does the tangent at a point to the velocity-time graph represent?

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: When a charged particle moves in a circular path in a perpendicular magnetic field, the momentum of the charged particle remains constant. Reason: Velocity of the charged particle remains constant.

A metal rod moves at a constant velocity in a direction perpendicular to its length. A constant, uniform magnetic field exists in space in a direction perpendicular to the rod as well as its velocity. Select the correct statements(s) from the following

A charged particle would continue to move with a constant velocity in a region wherein, which of the following conditions is not correct?

A large steel wheel is to be fitted on a shaft of the same material . At 27^@C , the outer diameter of the shaft is 8.70 cm and the diameter of the central hole in the wheel is 8.69 cm. The shaft is cooled using 'dry ice'. At what temperature of the shaft does the wheel slip on the shaft? Assume coefficient of linear expansion of the steel is to be constant over the required temperature range : alpha_(steel) = 1.20 xx 10^-5 K .

A body is moving along the boundary of a square plot of land with constant speed. Does its velocity remain unchanged ?