Physics Answers

a coil with 50 turns and area 10cm2 is oriented with a plane perpendicular with a 0.75-T magnetic field. if the coil is rotated over(rotated through 180) in 0.20s. what is the average emf induced in it. 0.375v

What is the momentum of a 0.04kg bullet moving north at a rate of 1500m/s?

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The ball dropped at 7m building has a velocity of 2.5m/s, it reaches the ground at

10.2s? What is the distance travelled by the ball?

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not exceeding 25V when it is connected to the main power supply a step-down transformer with 50 turns in the primary coil is used.Calculate the number of turns in the secondary coil when the voltage of the main power supply is 112V.

An electrical appliance works with a voltage not exceeding 25V when it is connected to the main power supply a step-down transformer with 50 turns in the primary coil is used.Calculate the number of turns in the secondary coil when the voltage of the main power supply is 220V.

Draw me a simple diagram of a step down transformer showing the core,primary winding and the secondary winding.

A simple diagram of a step down transformer showing the core ,primary winding and secondary winding

Determine the force between two positively charged particles that are separated by a distance of 3.71cm and that have charges of 1.4 x 10-5C and 3.2 x 10-5C.

A 60N motor winds a cable around a drum. (I) If the cable lifts a 3-ton load of bricks to a height of 12cm in 5 sec, calculate the efficiency of the motor. (II) At what rate is work done against friction?

 A small plastic sphere is charged to -10 nC. It is held 1.0 cm above a small glass bead at rest on a table. The bead has a mass of 15 mg and a charge of +10 nC. Will the glass bead “leap up” to the plastic sphere?