A fighter plane is flying horizontally at an altitude of 1.5 km with speed 720 km//h.At what angle of sightb (w.r.t.horizontal),when the target is seen,should the pilot drop the bomb in order to attack the target?

A fighter plane flying horizontally at an altitude of 1.5 km with speed 720 km//h passes directly overhead an anti-aircraft gun. At what angle from the vertical should the gun be fired for the shell with muzzle speed 600 m s^-1 to hit the plane ? At what minimum altitude should the pilot fly the plane to avoid being hit ? (Take g = 10 ms^2 ).

An aeroplane by the flying horizontally with a speed of 72 km h^(-1) releases a bomb at a height of 1000m. Find the time taken by the bomb to reach the ground.

The range of a particle when launched at an angle of 15^@ with horizontal is 1.5 km.What is the range of the projectile when launched at an angle of 45^@ to the horizonta?

An aircraft executes a horizontal loop at a speed of 720 km//h with its wings banked at 15^@ . What is the radius of the loop ?

An aeroplane is flying horizontally from west to east with a velocity of 900 km/hour. Calculate the potential differnece developed between the ends of its wings having a span of 20 m. The horizontal component of the Earth's magnetic field is 5 xx 10^-4 T and the angle of dip is 30^@ .

Two parallel vertical metallic rails AB and CD are separated by 1m. They are connected at the two ends by resistances R_1 and R_2 as shown in the figure. A horizontal metallic bar 1 of mass 0.2 kg slides without friction, vertically down the rails under the action of gravity. There is a uniform horizontal magnetic field of 0.6 T perpendicular to the plane of the rails. It is observed that when the terminal velocity is attained, the powers dissipated in R_1 and R_2 are 0.76W and 1.2W respectively (g=9.8m//s^2) The value of R_2 is

A circular coilof radius 0.157 m has 50 number of turns. It is placed such that its axis is in magnetic meridian. A dip needle is supported at the centre of the coil with its axis of rotation horizontal, and in the plane of the coil. The angle of dip is 30^(@) when a current flows through the coil. The angle of dip becomes 60^(@) on reversing the current. Find the current in the coil assuming that the magnetic field due to the coil is smaller than the horizontal component of earth's magnetic field, H =3xx10^(-5) T.

Ten small planes are flying at a speed of 150km/h in total darkness in an air space that is 20xx20xx1.5 km^3 in volume. You are in one of the planes, flying at random within this space with no way of knowing where the other planes are. On the average about how long a time will elapse between near collision with your plane. Assume for this rough computation that a safety region around the plane can be approximated by a sphere of radius 10m.

On a long horizontally moving belt (Fig. 3.26), a child runs to and fro with a speed 9 km h^-1 (with respect to the belt) between his father and mother located 50 m apart on the moving belt. The belt moves with a speed of 4 km h^-1 . For an observer on a stationary platform outside, what is the:- speed of the child running opposite to the direction of motion of the belt ?

On a long horizontally moving belt (Fig. 3.26), a child runs to and fro with a speed 9 km h^-1 (with respect to the belt) between his father and mother located 50 m apart on the moving belt. The belt moves with a speed of 4 km h^-1 . For an observer on a stationary platform outside, what is the:- speed of the child running in the direction of motion of the belt ?.