Chapter 3. HYDROSTATICS 3. An object with a weight of 500 N, weighs 450 N when suspended in water. Determine the
relative density of this object.
4. The density of ice is 920 kg m-3 while that of water is 1025 kg. m. What fraction of an
iceberg is submerged?​

Aneutron and a proton combine to form a nucleus. why does the mass of the nucleus differ from the sum of the masses of the individual nucleons?

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?