A convex mirror is used in the following ways: 1. As a rear view mirror in vehicles such a car, bus and truck. 2. In shopping complexes an d large shops to keep an eye on customers and shoplifters. . . .
A concave mirror is used in the following ways: 1. It is used as a shaving mirror. 2. It is used as a reflector in torches, lighthouses etc.. 3. A dentist uses a concave mirror to obtain a magnified image of the teeth of the patient. 4. In astronomical telescopes, it is used to view magnified images of heavenly bodies. . . .
1. Dry cells are light in weight and small in size. 2. Dry cells can easily carried from one place to another. 3. There is no fear of leakage in the dry cells. 4. They can easily be used to run the simple electrical devices. . . .
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Following are the six simple machine swhich are generally use in our daily life: 1. The lever e.g. mango cutter, beam balance etc. 2. The pulley e.g. pulley 3. The wheel and axle e.g. door knob steering wheel etc. 4. The inclined plane e.g. staircase, ramp etc. 5. The wedge e.g. needle, axe etc. 6. The . . .
In most of the machines, the load is greater than the effort, However, in some machines, the load is equal to the effort or less than the effort but in such cases, the effort acts in a desired direction or at a convenient point which makes the job easy. Machine has the following two functions: 1. It changes the magnitude of the force required, i.e . . .
Pulley consists of two types: 1. Single Fixed Pulley System: It consists of single pulley. It is attached to some high platform and around its groove passes a rope. One end of the rope is attached to the load. Effort is applied at the other end of the rope. This pulley is commonly used in drawing water from village wells. 2. Sing . . .
Pulley is a flat circular disc having a groove in its edge and capable of rotating around a fixed point passing through its central axis commonly called axle. In a way axle is a fulcrum around which pulley rotates. . . .
Combine each set of sentences into one Simple sentence by using Participles: He hurt his foot. He stopped. The thief had been in prison before. He received severe sentences. He was unwilling to go any further. He returned home. They saw the uselessness of violence. They changed their policy. He was weary of failure. He emigrated to Africa. . . .
Here are some wonderful quotes on hard work and success! 1 2. 3. 4. 5. 6. 7. 8. 9. 10. . . .
Valency It is the combining capacity of elements or The number of electrons donated, accepted or shared by an atom to complete 8 electrons in its outer most shell (octet rule) is called its valency. Ions or Radicals with positive val . . .
In this types of levers the effort is situated between the load and the fulcrum. In the levers of third order, the effort arm is always smaller than the load arm. Thus more effort is required to lift a lighter load, This lever is also called speed multiplier lever as load moves through lerger distance as compared to the effort. For examples: Sugar . . .
In this type of levers, the load is situated between the effort and the fulcrum. In the levers of second order, the load arm is always smaller than the effort arm. Thus always less effort is required to move a heavy load. For examples: Nut cracker, wheel barrow, oars of a boat are levers of the second order. this lever is also called force m . . .
It states that the product of an effort with effort arm is equal to the product of load with load arm. Load x Load arm = Effort x Effort arm . . .