Q 1. The percentage increase in the area of a rectangle, if each of its sides is increased by 20%, is:
Cogwheel number 1 rotates counterclockwise as shown.
If the red cogwheel rotates in the direction of the arrow choose option 1; if it rotates in the opposite direction choose option 2; if the red cogwheel does not move at all choose option 3.
The diagram shows two fixed cogwheels which can only rotate around their own axis. A rack is inserted between the two cogwheels and is moved in the direction shown by the arrow. What are the directions of movement and velocities of the cogwheels?