Which type of lever is best for a catapult?

A rifled gun barrel shoots more acurately because it causes the bullet to:

At what depth is a submarine designed to operate?

The Doppler effects cause which characteristic of an energy wave to change?

Doppler radar is used to track the movement of

Which invention most revolutionized military weapons

Which is NOT an ingredient in gunpowder

Who first invented gunpowder?

What branch of physics studies the movement of projectiles?

What part of a tank makes it unique- different from other vehicles?

What vehicle was designed for underwater warfare?

What physical property allows submarines to rise and sink in the water?

What substance is used as ballast on a submarine?

What invention allows for the detection of objects using radio waves?

What invention allows for detection of objects using sound waves?

Which kind of radar system listens for signals only?

Which invention required submarines to be made larger?

Which military invention was first used in World War I?

Which of the following served some of the same military purposes as a tank?

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