Two ships on the surface receive a signal from the bottom at different times. Find the depth of the sea.

Two research ships are distance S= 3600 meters apart on the ocean surface. Ship A now drops an explosive device overboard which sinks and explodes upon reaching the bottom. The sound of the explosion is received by A, directly above, 1.5 seconds before it is received by B. Assume the sound travels at v= 1450 m/sec in sea water ...continues

Sound frequency and/or wavelength changes due to motion of the observer, and/or the source is the 'Doppler effect'.

A truck is moving at 50 m/sec while its horn emits a steady note at 280 cy/sec. A woman is stationary, 150 meters ahead of the truck. A man is in a car, 200 meters ahead of the truck, moving toward the truck at a speed of 30 m/sec. The speed of the sound is 345 m/sec. PART a. Find the frequency heard by the woman. PART b. ...continues

Submarine A detects sound from sub B. Given the frequency received and knowing that emitted, find the velocity of sub B.

Submarine A, with velocity 21 m/sec, receives from directly behind it, the sound with frequency 266 cy/sec, from submarine B which is known to emit sound at 265 cy/sec. The two submarines are 1800 meters apart. Speed of sound in sea water 1450 m/sec. If the two subs maintain courses and speeds, will there be a collision, and i ...continues

John and Sue are descending on ropes into a cave. Sue's rope breaks and she falls screaming past John. Apply doppler effect.

John, hanging stationary on a rope in an underground cave, hears Sue screaming with frequency f as she falls past him with constant terminal speed S= 53 m/sec. While she is above him he receives her scream as frequency fA, and after she passes him he receives frequency fB, which is 96 cy/sec less than fA. Exactly t= 3.6 seconds ...continues

Given two guitar strings' lengths and relative densities, find information about their frequencies and tensions.

The thinnest string on a certain guitar has a linear density one fifteenth the linear density of the thickest string. Both strings are the same length, L= .64 m. NOTE: On a musical scale a note one octave higher than a certain note is twice the frequency of that note. PART a. If both strings have the same tension force, find ...continues

An aluminum and an iron bar are of unequal length. Find the final temperature at which they are equal length.

An iron bar whose length is 60.00 meters is at 0 degrees Celsius. An aluminum bar whose length is 60.05 meters is at +10 degrees Celsius. Find a temperature at which they are the same length. The coefficient of expansion of iron is 11 E -6 per C degree. The coefficient of expansion of aluminum is 24 E -6 per C degree.

Finding the total distance traveled given velocity and time.

A body which is uniformly accelerated, changes its velocity from 36km/h in one direction to 18km/h in the opposite direction in 6 seconds. Find the total distance traveled in that time.

Springs: Different force constants.

Springs A and B are identical except that A is stiffer than B, that is the force constant Ka is greater than the force constant Kb. On which spring is more work expended if, (a) They are stretched by the same amount? (b) They are stretched by the same force?

Working with a buoyant force on a balloon.

A balloon is descending with a constant acceleration "a" less than 'g' weight of the balloon with the basket and the contents is W. What weight m of the basket should be released so that the balloon will begin to accelerate upwards with constant acceleration 'a' ? Neglect air resistance.

Elastic collision : Finding the unknown mass.

A body of 2kg mass makes an elastic collision with another body at rest and afterwards, continues to move in the original direction but with one fourth of its original speed. What is the mass of the struck body?