The scissors jack uses a long bolt to squeeze together two arms that then lift the car.
basically simple hydraulics pressure displacement
The scissor style jack contains only two simple machines: the screw and the lever.
scissor
Yes, I think I remember learning it is a lever.
http://chestofbooks.com/home-improvement/Household-Companion/Practical-Mechanics/The-Working-of-the-Bell.html go to this site the whole working plus the diagram is available.
The working principle of these instruments is same as that of the d'Arsonval type of galvanometers, the difference being that a direct reading instrument is provided with a pointer and a scale. The basic principle of this device is the interaction of magnetic field of the compass (a permanent magnet) and the field around the conductor (a simple electromagnet)
The PIR sensors use the detectors or pyroelectric sensors to work. Example include the automatic door openers.
One can purchase an automobile by going to a local automobile dealership. This is simple because most automobile dealerships are located in clusters close together.
Wheel and axle.
pulley lever screw cork screw scissor inclined plane
The answer for rate in simple interest is =rate= simple interest\principle*time
spoon and fork,crowbar,hanger,nailcutter,scissor,clip,and etc