A marine survey ship sends a sound wave straight to the sea bed. It detects an echo 4.0 s later. What is the approximate depth of the sea?

A sonar device on a submarine sends out a signal and receives an echo 5s later. Calculate the speed of sound in water if the distance of the object from submarine is 3,625 m.

A message was transmitted from boat which returned to the sender after reflection from the bottom of the sea in 0.8 s. If the velocity of sound in water is 1500ms^-1 then find the depth of sea.

The rear side of a truck is open and a box of 40 kg mass is placed 5 m away from the open end as shown in Fig. 5.22. The coeffcient of friction between the box and the surface below it is 0.15. On a straight road, the truck starts from rest and accelerates with 2 m s^-2 . At what distance from the starting point does the box fall off the truck? (Ignore the size of the box).

A SONAR (sound navigation and ranging) uses ultrasonic waves to detect and locate objects under water. In a submarine equipped with a SONAR the time delay between generation of a probe wave and the reception of its echo after reflection from an enemy submarine is found to be 77.0 s. What is the distance of the enemy submarine? (Speed of sound in water = 1450 m s^-1 ).

In the given progressive wave y=5sin (100pit-0.4 pix) where y and x are in m, t in s. What is the amplitude

A transverse harmonic wave on a string is described by y(x. t) = 3.0 sin (36 t + 0.018 x + (pi//4)) where x and y are in cm and tin s. The positive direction of x is from left to right. What is the least distance between two successive crests in the wave ?

A horizontal straight wire 10 m long extending from east to west is falling with a speed of 5.0 m s^-1 , at right angles to the horizontal component of the earth’s magnetic field, 0.30 xx 10^-4 Wb m^-2 , What is the instantaneous value of the emf induced in the wire?

A horizontal straight wire 10 m long extending from east to west is falling with a speed of 5.0 m s^-1 , at right angles to the horizontal component of the earth’s magnetic field, 0.30 xx 10^-4 Wb m^-2 , What is the direction of the emf?

A transverse harmonic wave on a string is described by y(x. t) = 3.0 sin (36 t + 0.018 x + (pi//4)) where x and y are in cm and tin s. The positive direction of x is from left to right. What is the initial phase at the origin ?