What is a system in science this is my last question

What factors effect the amount of momentum of an object has?

A runner runs 300 m at an average speed of 3.0 m/s. She then runs another 300m at an average speed of 6.0 m/s. What is her average speed for the total distance of 600m? A 2.0 m/s B 4.0 m/s C 4.5 m/s D 8.0 m/s

A potter's wheel-a thick stone disk of radius 0.500 m and mass 110 kg-is freely rotating at 50.0 rev/min. the potter can stop the wheel in 6.00 s by pressing a wet rag against the rim and exerting a radially inward force of 68.0 n.

Which would be the most reliable source of information about the weather

As a vector, displacement has which qualities? magnitude only, direction only, magnitude and direction, neither magnitude or direction

A 125-kg merry-go-round in the shape of a uniform, solid, horizontal disk of radius 1.50 m is set in motion by wrapping a rope about the rim of the disk and pulling on the rope.

Jose wandered 4 kilometers at 2 kilometers per hour. How long did Jose wander?

What is the acceleration of a 10kg pushed by a 5n force

A device that changes thermal energy into mechanical energy

You and your roommate are moving to a city 380 mimi away. Your roommate drives a rental truck at a constant 55 mi/hmi/h, and you drive your car at 65 mi/hmi/h. The two of you begin the trip at the same instant.