Why are arrows of varying lengths used to represent forces?

a hammer falls off a roof and strikes the ground with a certain kinetic energy. If it fell from a roof twice as tall, how ouwld its kinetic energy compare? Explain.

Which italian concluded that moving objects not subjected to friction or any other force would continue to move indefinitely?

Find the acceleration of a train whose speed increases from 9 m/s to 22 m/s in 160 s.

At a pressure 43 kPa, the gas in a cylinder has a volume of 12 liters. Assuming temperature remains the same, if the volume of the gas is decreased to 8 liters, what is the new pressure?

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.

Which represents a system that is almost completely closed?

If many household substances classify as acids or bases what is the ph scale

A protostar forms once the nebular cloud condenses and the core begins

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are

How much force would be needed to move a car with the mass of 100kg to an acceleration of 5m/s/s?