Help me plz ASPA which Local Groups are expanding more (or faster) the ones which are CLOSE together or the ones that are FAR apart? (Answer in a complete Sentence).​

Atoms containing radioactive nuclei are called

The stopwatch used by a student to measure velocity of a pulse in a slinky was of least count 0.1 second. he stops the stopwatch when a pulse has made 3 journeys from one end to the other of the slinky. he finds the seconds hand to be at 52nd division. calculate the correct time noted by him.

Aforce or 500 n separates two objects the distance between their centers is 67 m the first object has a mass of 20kg what is the mass of the second