An experiment was conducted to determine the density of a rock sample. the table shows a partial record of the experiment.
experimental record
mass of rock 86.5 g
volume of water in the graduated cylinder 142.5 ml
?
what information should be recorded in the last row of the table?
ratio of the gravitational pull on the rock to the mass of the rock
ratio of the volume of the water to the mass of the rock
time taken for the rock to roll down an inclined plane
volume of water with the rock immersed in it

Prompta snowboarder stands at the top of a hill and decides to see if he can increase his speed on his next trip down the slope. describe one thing the snowboarder could do to incrlase his speed on the slope. explain why this would cause his speed toincrease relate one of newton's laws to this problem.

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?