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Directions:Study the information given below carefully and answer the question that follows:
A, B, C, D, E, F, G, H and I are nine houses. C is 2 km east of B. A is 1 km north of B. H is 2 km south of A. G is 1 km west of H. D is 3 km east of G, and F is 2 km north of G. I is situated just in middle of B and C, while E is just in middle of H and D.
The distance between E and G is (A) 1 km (B) 1.5 km (C) 2 km (D) 5 km
Question of the Day: A small charged ball is accelerated from rest to a speed v by a 300 V potential difference. If the potential difference is changed to 1200 V, What will the new speed of the ball be ?
Description : This is an interesting experiment to show the total internal reflection. We get the total reflection if the light enters to an optical less dense material and the incidence angle is big enough. The incidence angle at which the ray refracts exactly along the boundary line, is called the boundary angle of the total reflection. With the total reflection we can lead the light along the curved ways, as optic fibers or water jets.
Question of the day:
As a car moves up a hill, there is a force of friction between the road and the tires rolling on the road. The maximum force of friction is equal to
a. the weight of the car times the coefficient of kinetic friction.
b. the normal force of the road times the coefficient of kinetic friction.
c. the normal force of the road times the coefficient of static friction.
e. the weight of the car times the coefficient of static friction.
Question of the day: Which of the following statements describes an electric generator? A. A magnet is rotated through a coil of wire to produce an electric current. B. Electric potential in a rotating coil of wire creates a permanent magnet. C. An electrical current causes a coil of wire to rotate in a magnetic field. D. Forces from a permanent magnet allow a coil of wire to rotate.