Thermodynamics : Calculating the changes in internal energy of a system and the environment.

A system does 164 J of work on its environment and gains 77 J of heat in the process. Find the change in the internal energy of (a) the system (b) the environment

Venturi meter readings sphere density.

1a) A venturi meter has 0.02556m^3 of flow per second through its 45mm dia throat.If the pipe is 58mm in diameter,what will the differential reading of mercury across it be? b)A metal sphere 60mm in dia is submerged in oil with a relative density of 0.9.Need to find the density of the sphere.There is a downward force of 8.31N wh ...continues

Periodic Waves : Calculating time given speed of a transverse wave, amplitude, and distance.

The speed of a transverse wave on a string is 450 m/s, while the wavelength is 0.18m. The amplitude of the wave is 2.0mm. How much time is required for a particle of the string to move through a total distance of 1.0 km?

A mathematical description of a wave.

The displacement (in meters) of a wave is y= 0.26 sin (pi *t-3.7 pi *x), where t is in seconds and x is in meters. (a) Is the wave traveling in the +x or -x direction? (b) What is the displacement y when t= 38 seconds and x= 13 meters?

Sound

A sonar unit on a submarine sends out a pulse of sound into seawater. The pulse returns 1.30 seconds later. What is the distance to the object that reflects the pulse back to the submarine?

Finding the distance at a particular sound intensity.

A rocket in a fireworks display explodes high in the air. The sound spreads out uniformly in all directions. The intensity of the sound is 2.0 *10^-6 W/m^2 at a distance of 120 m from the explosion. Find the distance from the source at which the intensity is 0.80 *10^-6 W/m^2.

Decibels

The volume control on a stereo amplifier is adjusted so the sound intensity level increases from 23 to 61 dB. What is the ratio of the final sound intensity to the original sound intensity?

Decibels

The volume control on a stereo amplifier is adjusted so the sound intensity level increases from 23 to 61 dB. What is the ratio of the final sound intensity to the original sound intensity?

sound

A sonar unit on a submarine sends out a pulse of sound into seawater. The pulse returns 1.30 seconds later. What is the distance to the object that reflects the pulse back to the submarine?

Periodic waves

A longitudinal wave with a frequency of 3.0 Hz takes 1.7 seconds to travel the length of a 2.5m Slinky. Determine the wavelength of the wave.