Which best describes what Einstein's theories tried to explain?

the creation of the universe

evolution and human development

how the physical world functions

the possibility of time travel

A kiddie roller coaster car has a mass 100 kilograms. At the top of a hill, it's moving at a speed of 3 meters/second. After reaching the bottom of the hill, its speed doubles. The car's kinetic energy at the bottom is its kinetic energy at the top.

A solid form from liquid reactants during a chemical reaction

A car travels at a constant rate for 100 miles going due west for one hour. Then it travels at a constant rate for another 75 miles west for one hour.

Suppose your family complained that the music you play in your room is too loud. what could you do to reduce the amount of sound they hear?

A proton moves perpendicular to a uniform magnetic field B with arrow at a speed of 2.50 107 m/s and experiences an acceleration of 2.20 1013 m/s2 in the positive x-direction when its velocity is in the positive z-direction.

What's the difference between the offspring of an asexual organism and a sexual organism

The contamination that results from the spread of bacteria from meat to vegetables is called

A rock has a mass of 5 kg on the moon. What is the mass of the rock on the earth

A battery applies 45 volts to a circuit, while an ammeter reads 10 ma. later, the ammeter reading drops to 7 ma. assuming the resistance has not changed, the voltage must have

A 150-kg object takes 1.5 minutes to travel a 2,500 - meter straight path. It begins the trip traveling 120 m/s and decelerates to a velocity of 20 m/s. What is the acceleration?