How do we know the universe is a closed system?

Two objects are in freefall. Object A experiences a gravitational force of 10 N. Object B experiences a gravitational force of 20 N. Which experiences the greater acceleration?

If one light bulb is removed from a parallel circuit with three bulbs, the brightness of the other bulbs will decrease.

The potential difference across a variable resistor is 11V and the current flowing through it is 0.4A. What is the present resistance of this variable resistor?

Chicago is often referred to as the "Windy City". What is the cause of all this wind?

A curved section of roadway is in the shape of a circular arc of 410-m radius. The curved section is horizontal, not banked. The coefficient of friction for tires and the roadway is 0.40.

Why does honey flow more slowly than water?

What will happen when an object is not in equilibrium

Which has a neutral charge?

A 2kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving at this speed and in this direction

How do we know the universe is a closed system?