(mass 65kg) stands on a scale (calibrated in newtons) in a lift. 1. What is the reading on the scale when lift is stationary?

2.what will be the reading on the when the lift moves upwards at a constant velocity of 3m. s‐¹​

8. why do radio telescopes convert radio waves (analog signals) to electrical (digital) signals for analysis? (hint: what did the article say about the advantages of digital signals? )

Astone dropped into a well is heard to strike the water after 8seconds. find the depth of the well if the velocity of sound is 350m/s

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?