Each cubic inch of mercury is .5 lb, what is the pressure at the bottom of a column 30 inches tall if there is a vacuum above the mercury?

An ideal transformer has 60 turns in its primary coil and 360 turns in its secondary coil. if the input rms voltage for the 60-turn coil is 120 v, what is the output rms voltage of the secondary coil?

What is meant by the statement" the melting poin of glycerine is 13 degree celsius

The seven sisters, seven stars located more than 400 light-years away in the taurus constellation can be seen here with venus and another constellation, orion. the seven stars stay grouped together but seem to move, like the planet venus. why do stars seem to move like planets in the night sky?