What does the coefficient of static friction depend on? Already Coulomb presented experimental evidence that the static coefficient of friction may depend on time, on normal force, on the contact size, on the nature of contacting materials, and on the presence of intermediate lubricant layers. What is the static coefficient of friction? The coefficient of […]
Is hammer a metal or non metal?
Is hammer a metal or non metal? In contrast, materials like coal and sulphur are soft and dull in appearance. They break down into powdery mass on tapping with hammer. They are not sonorous and are poor conductors of heat and electricity. These materials are called non-metals. Can a hammer break metal? Because the hammer’s […]
What is the difference between a desert and a savanna?
What is the difference between a desert and a savanna? savanna is tropical grassland with widely scattered trees or clumps of trees. A Desert is a biomein which the lack of precipitation limits plants growth; deserts are found in both temperate and tropical regions. What are the three types of prairies? Three types of prairie […]
Is upward positive or negative?
Is upward positive or negative? We consider the direction of gravity as positive and the upward direction as negative. Displacement is positive below the starting point and negative above. Velocity is positive in a downward direction and negative when going upward. For horizontal motion, right is positive and left is negative. Is lift an upward […]
What are the 4 parts of an animal cell?
What are the 4 parts of an animal cell? The components of a cell and their functions are described: membrane, cytoplasm, nucleus. What is the main function of an animal cell? Functions of Animal Cells A cell carries out all the processes of the body which includes producing energy and storing it, making proteins which […]
What is electric field and its SI unit?
What is electric field and its SI unit? Electric fields and magnetic fields are both manifestations of the electromagnetic force, one of the four fundamental forces (or interactions) of nature. The derived SI units for the electric field are volts per meter (V/m), exactly equivalent to newtons per coulomb (N/C). What is SI unit of […]
Which direction does a freely suspended magnet point to?
Which direction does a freely suspended magnet point to? A freely suspended magnet always rests in the north-south direction because the magnetic south pole of the earth lies in the geographic north direction and the magnetic north pole of the earth lies in the geographical south direction. Why does a freely suspended magnet? A freely […]
What should manifold absolute pressure be at idle?
What should manifold absolute pressure be at idle? The vacuum inside an engine’s intake manifold, by comparison, can range from zero up to 22 inches Hg or more depending on operating conditions. Vacuum at idle is always high and typically ranges from 16 to 20 inches Hg in most vehicles. What PSI should a MAP […]
Why only Tungsten is used in bulb?
Why only Tungsten is used in bulb? Tungsten is used for making filament of an electric bulb due to the following reasons: Being an alloy it has a very high melting point. It has very high resistivity so it does not burn easily at room temperature. The lamp glows at high temperatures. What is the […]
What is the most frequently cited cause of multiple vehicle crashes?
What is the most frequently cited cause of multiple vehicle crashes? In fact, the National Highway Transportation Safety Administration (NHTSA) reports more than one out of four of all traffic fatalities and almost 17 percent of all fatal crashes in 2017 resulted from speeding. When a traffic collision does not lead to death, the most […]