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An extension wire in your house is 3 meters long with a cross-sectional are of 4.50 x 10-6 m2. An electrician experienced a mild electric shock when he accidentally touched this wire carrying 5.2 mA for approximately 1.2 s. How many electrons constitute the given current he experienced?



the earth in the direction 30 degrees north of east. If the velocity of the boat due to wind is 3kph eastward, and due to water current, its velocity is 7kph southward. What are the magnitude and direction of the velocity of the boat due to its own power?

A 10Mg truck rolling at a constant speed of 30kph along a horizontal rail comes to an incline of slope of sin-1 0.1. Calculate how far it will roll us the slope before coming to a halt, (a) ignoring all resistive forces, and (b) assuming the rolling resistance is 5% of the normal reaction of the truck.

The radio tuning capacitor consists of 26 plates of area 24 cm2. The distance between plates when set for maximum capacitance is 2mm. Assuming that the area of projection at maximum capacity is equal to the area of the plates, find the maximum capacity of this condenser.


The electric field has a magnitude of 3.0 N/C at a distance of 30 cm from a point charge. What is the charge? 


2. A force 75 N pushes the 3 blocks (m1 = 3 kg, m2 = 5 kg and




m3 = 7 kg) in a frictionless surface. Determine the contact force




of m1 on m2, and m2 on m3.

The electric field of the material between two coaxial cables of radius .25m and .51m is given as E= 2.58 V.m/r^3. If the conductivity of the material is 5 x 10^10 S/m, what is the current density in the material?

an ice cube of mass 50.0g flows on the surface of a strange brine solution or volume 200.0cm³ inside the measuring silinder calculate the level of the liquid in the measuring cylinder before and after the ice melted


What iw the magnitude of the force that a 25x10^-6 C C charge exerts on a 10x10 ^ -6 C charge 8.5 cm away?


Three-point charges of 0.07uC and 0.24uC are 35 cm apart in air. What is the potential energy of the system?






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