What is a closed system?

A. A system in which no work is done

B. A system that can exchange matter with its surroundings

C. A system that cannot exchange matter with its surroundings

D. A system in which no heat flows

You cant see the cells in your body because most of them are very small true or false?

Matthew has a mass of 90kg. and is trying to increase his weight by doing plenty of exercise riding to build his muscles. He rides his bike daily at an average speed of 4.5m/s for 1.5 hours. How far will Matthew travel

An astronaut weighs 104 newtons on the moon where the strength of gravity is 1.6 newtons per kilogram whatbis the mass

A woman does 260 J of work to move a table 1.9 m across the floor. What is the magnitude of the force applied by the woman to the table if this force is applied in the horizontal direction?

This is the fundamental force which holds particles together to form protons and neutrons

A CFL bulb has an efficiency of 8.9% and a power of 22 W. How much light energy does the lightbulb produce in 1 second

Which of the following is true of high clouds?

A ferris wheel takes 5 minutes to complete one full rotation, what is the angular velocity of the ferris wheel

A heat engine has a thermal efficiency of 45%. how much power does the engine produce when heat is transferred into it at a rate of 109 kj/hr?

Dos pelotas de tenis se lanzan verticalmente, hacia arriba y desde el mismo punto, con 2 s de diferencia. La velocidad inicial de la primera es de 20 m/s, y la de la segunda, de 30 m/s.