A group of students built a ramp and rolled steel balls of different sizes down the ramp onto the floor. Then they measured how far each ball rolled from the bottom ol the ramp.
Ramp Experiment Results
Mass of Steel Ball Distance Rolled
5.3 grams
1.2 meters
8.5 grams
2.0 meters
12.4 grams
3.1 meters
15.8 grams
3.9 meters
Which statement correctly explains the differences in the distances that the balls rolled?
O Friction increased as mass increased
O Velocity increased as mass increased.
Acceleration increased as mass increased.
Kinetic energy increased as mass increased.

Calculate the number of moles of ethane in 100 grams

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Which statement about hf is true? it is zero for any compound in its standard state. it is positive when the bonds of the product store more energy than those of the reactants. it is negative when a compound forms from elements in their standard states. it is zero for any element that is in the liquid state.