Fluids

The top of the Sears tower in Chicago is 600m tall. If your office is located on the top floor, A.What is the difference in air pressure between your office on the top floor and those offices on the ground floor? B.What is your answer in terms of atmospheres?

Calculating the sound level given intensity.

If the sound intensity of a brass band is 2.5x10^-2 W/m^2, what is the sound level of the band?

Calculating the wavelength given velocity and frequency.

The end of a string is moved up and down with a frequency of 125 vibrations/sec. If the waves produced have a velocity of 40m/sec, what is their wavelength?

Finding the ratio of the amplified intensity to the unamplified intensity.

An amplified guitar has a sound intensity level that is 14 dB greater than the same unamplified sound. What is the ratio of the amplified intensity to the unamplified intensity?

Calculating the speed of a wave if the tension of a string is increased.

A transverse wave is traveling with a speed of 300 m/sec on a horizontal string. If the tension in the string is increased by a factor of four, what is the speed of the wave?

Velocity, frequency of sound

1.A supersonic jet traveling at Mach 3 at an altitude of 20000m is directly overhead at time t=0. A) How long will it be before the ground observer encounters the shock wave? B)Where will the plane be when it is finally heard?(Assume an average value of 330m/s for speed of sound in air) I will send what I have for this one ...continues

Rate of formation of ice in a lake

Find the time in which a layer of ice 3cm thick on the surface of a pond will increase its thickness by 1mm when the temperature of the surrounding air is -200 C. Thermal conductivity of ice = 0.005, Latent heat of ice = 80cal/g and the density of ice at 00 C = 0.91g/cm3

Determine the principal stresses and the maximum shear stress in a spindle

The pedal crank of a racing cycle is to be analysed to assess whether the stresses are excessive. Pedal loads can reach 500N (causing bending) and produce a torque of 100Nm. The location of load application alternates each half rotation of the spindle (from locations A to F) as shown in the attached diagram. Determine the p ...continues

Determine the maximum stress in a mast

NOTE: MOVED TO PHYSICS FROM MECHANICAL ENGINEERING The mast of a racing yacht stands 22m above the deck and is rigidly attached to the hull and keel. The mast supports a triangular sail which is 20m high and 4m wide at the boom and may be idealised as shown in the diagram. The mast is constructed using 250mm outside diamet ...continues

Electrical Energy and Capacitance

1. On planet Tehar, the free fall acceleration is the same as that on Earth but there is also strong downward electric field with the field being uniform close to the planet's surface. A 2.00 kg ball having a charge of 5.00 mC is thrown upward at a speed of 20.1 m/s and it hits the ground after an interval of 4.10 s. What is the ...continues