What can stay constant if there were no forces

A train travels 51 kilometers in 2 hours, and then 53 kilometers in 5 hours. What is its average speed?

A wind turbine takes in energy from wind with the goal of converting it into electrical energy. Much of the wind energy is also converted into the kinetic energy of the spinning turbine and heat lost to the air around it.

How could you increase a magnet's power without using electricity?

What is the period number of hydrogen

What is the relationship between the electric force and distance between two charges?

A stone is thrown vertically upward with an initial speed of 19.3 m/s. Neglect air resistance. The speed of the stone when it is 5.81 m higher is:

A violently rotating column of air is formed around a region of extremely low air pressure above land. Which of these weather conditions is most likely to follow? blizzard cyclone tornado hurricane

How to indicate kinetic energy

During induction, a positively charged rod is brought near to but not touching the electroscope. The presence of the charged object above the plate of the electroscope induces charges to move down into the gold leaves, giving the electroscope an

You are operating a boat with a power ventilation system. you have just fueled this boat. how long should you let the ventilation system run before starting the engine?