1 . the mass of a substance per unit volume density 2 . a proposed explanation for a scientific problem matter 3 . standard metric unit of length control 4 . standard metric unit of mass meter 5 . anything that has mass and occupies space hypothesis 6 . a quantity in an experiment that remains unchanged or constant kilogram

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

If steel is more dense that lake water, why can a boat float