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A sphere is charged to 20 µC. Find the potential at the following points. A, B and C (A point is at the center of the sphere, B is at the surface and C is 4cm from the surface.) AB r1=2cm, BC r2=4cm

The ratio of the radius of the output piston and that of the input piston in a hydraulic jack is 5:2.
How much load will be raised when an effort of 200N is applied at the input piston?
A sphere is charged to 20 µC. Find the potential at the following points. A, B and C (A point is at the center of the sphere, B is at the surface and C is 4cm from the surface.)

You drop a rock into a well and count the seconds before you hear a splash. If you counted 10 seconds before you heard the splash, how deep is the well?

Calculate the crop growth rate if the dry weight of the corn crop was 14g on 18 July, 2019 and dry weight of corn crop was 35g obtained on 02 August 2019.
Find the sum of these four vector forces: 12.5 N to the right at 35° above the horizontal, 31.8 N to
the left at 55° above the horizontal, 81.4 N to the left at 30° below the horizontal and 24.0 N to
the right at 50° below the horizontal.
A 5 kg Blocks slides along a rough horizontal surface the coefficient of kinetic friction for the block and the surface is 0.4 at what rate in watts is the frictional force doing work on the block at the instant when it’s Speed s 5 m/s
A 5 kg Blocks slides along a rough horizontal surface the coefficient of kinetic friction for the block and the surface is 0.4 at what rate in watts is the frictional force doing work on the block at the instant when it’s Speed s 5 m/s
What does an object have more of if it is positively charged
The three finalist in a contest are brought to the center of a large flat field. calculate the following displacements:
72.4 m, 32^o east of south
57.3 m, 36^o south of west
17.8 m straight south
What is the magnitude and direction of the resultant?
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