During a thunderstorm if you notice a 3 second delay between the flash of lightning and sound of thunder. What is the approximate distance of thunderstorm from you.

In a bucket and ball race, a bucket is placed at the starting point, which is 5 m from the first ball, and the other balls are placed 3 m apart in a straight line. There are ten balls in the line. A competitor starts from the bucket, picks up the nearest ball, runs back with it, drops it in the bucket, runs back to pick up the next ball, runs to the bucket to drop it in, and she continues in the same way until all the balls are in the bucket. What is the total distance the competitor has to run? (Hint: To pick up the first ball and the second ball, the total distance (in metres) run by a competitor is 2 x 5 + 2 x (5+3)]

A point object is placed on the axis of a thin convex lens of focal length 0.05 m at a distance of 0.2 m from the lens and its image is formed on the axis. If the object is now made to oscillate along the axis with a small amplitude of A cm, then what is the amplitude of oscillation of the image ? [you many assume, 1/(1+x) = 1-x , where x lt lt 1 ]

Suppose you are shooting an arrow from the top of a building at an height of 6 m to a target on the ground at an angle of depression of 60^(@) . What is the distance between you and the object?

Two roads AB and BC intersect at B, where angleABC = 60^(@) and bar(AB) = 28 meter. A cyclist starts from A and moves towaeds B at the rate of 4m/sec and at the same instant another cyclist starts from B and moves along the road BC at the rate of 8 m/sec. find the rate of change of distance between them 3 seconds.

Answer any One question : From a quay of a river, 600 metres wide, two boats start in two different directions to reach the opposite side of the river. The first boat moves making an angle of 30^@ with this bank and the second moves making an angle 90^@ with direction of the first boat. What will be the distance between the two boats when both of them reach the other side?

A current I is flowing along an infinite, straight wire, in the positive Z-direction and the same current is flowing along a similar parallel wire 5 m apart, in the negative Z- direction. A point P is at a perpendicular distance 3 m from the first wire and 4 m from the second. What will be magnitude of the magnetic field vecB at P?

In Young' s double slit experiment, two monochromatic light of wavelengths 650 nm and 520 nm are used to form an interference pattern . Seprsation between the two slits is 2xx 10^(-3) m and screen is 1.20 m away from the slits. At what minimum distance apart from the central maxima, bright fringes due to both the waves will be overlapped?