how to core drill

The core consists of two parts: the inner core and outer core. The outer core begins about 2,900 kilometers below the earth's surface. Scientists believe that the outer core is about 2,250 kilometers thick and is made of melted iron and nickel. The ..

On comparing the two-field pattern, the current carrying solenoid from outside resembles a bar magnet. Inside the solenoid there is a strong magnetic field, which can magnetise a specimen. Solenoid is hollow from inside whereas the bar magnet is solid. Here we note the close similarity between the..

An oil drilling company pumps 62 gallons of oil per minute into tankers. Find the time taken to pump 2852 gallons of oil into the tankers, if number of gallons of oil pumped is directly proportional to the time taken for pumping. => 38 minutes or 43 minutes or 46 minutes or 45 minutes..

An oil drilling company pumps 308 gallons of oil in four minutes into tankers. Find the time taken to pump 1925 gallons of oil into the tankers, if the number of gallons of oil pumped is directly proportional to the time taken for pumping. => 77 minutes or 82 minutes or 20 minutes or 25 m..

Geothermal Energy - Ever since the earth was formed, huge amount of heat energy has been stored in its molten core. Some of this heat is always flowing towards the surface. This heat is called Geothermal Energy. The hot interior of the earth heats up the layers of rocks above it. The wate..

At a school, the students participating in the mass drill formed a circle of area 78.50 square feet. What is the radius of the circle, if the area is modeled by the equation, A = 3.14 r 2 , where A is the area in square feet and r is the radius in feet ? => 4 or 6 or 5 or 7..

1. Diamond is used as a gem (except the black variety) due to its brilliance. 2. Black variety of diamond is use for cutting glass, as drilling bits for industrial drills, for polishing other diamonds e..

The core of a toroid having 3000 turns has inner and outer radii of 11 cm and 12 cm respectively. The magnetic field in the core for a current of 0.70 A is 2.5 T. What is the relative permeability of the core..

An electromagnet can be defined as a soft-iron core that is magnetised temporarily by passing a current through a coil of wire wound on the core. Principle: It is based on the magnetic effect of electric curre..

Electromagnet - An electromagnet can be defined as a soft-iron core that is magnetised temporarily by passing a current through a coil of wire wound on the core. Principle: It is based on the magnetic effect of electric curre..