Problem: Text: A boomerang is a thrown tool, typically constructed as a flat airfoil, that is designed to spin about an axis perpendicular to the direction of its flight. A returning boomerang is designed to return to the thrower. It is well known as a weapon used by Indigenous Australians for hunting.

Question: can a boomerang be used as a weapon?

OPTIONS:
- no
- yes
A: yes

Problem: Text: In mechanics, the normal force F n (\displaystyle F_(n)\ ) is that component of the contact force that is perpendicular to the surface that an object contacts. For example, the surface of a floor or table that prevents an object from falling. In this instance normal is used in the geometric sense and means perpendicular, as opposed the common language use of normal meaning common or expected. For example, a person standing still on flat ground is supported by a ground reaction force that consists of only a normal force. If the person stands on a slope and does not slide down it, then the total ground reaction force can be divided into two components: a normal force perpendicular to the ground and a frictional force parallel to the ground. In another common situation, if an object hits a surface with some speed, and the surface can withstand it, the normal force provides for a rapid deceleration, which will depend on the flexibility of the surface and the object.

Question: are the normal force and force of gravity always equal?

OPTIONS:
- no
- yes
A: no

Problem: Text: A transatlantic telegraph cable is an undersea cable running under the Atlantic Ocean used for telegraph communications. The first was laid across the floor of the Atlantic from Telegraph Field, Foilhommerum Bay, Valentia Island in western Ireland to Heart's Content in eastern Newfoundland. The first communications occurred August 16, 1858, reducing the communication time between North America and Europe from ten days -- the time it took to deliver a message by ship -- to a matter of minutes. Transatlantic telegraph cables have been replaced by transatlantic telecommunications cables.

Question: is there a cable between america and europe?

OPTIONS:
- no
- yes
A:
yes