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Homework Statement A gust of wind hits a flagpole and starts it oscillating. After 10 s, the amplitude of its motion has decreased to 25% of its initial value. What is the value of the time constant? Homework Equations xmax(t) = Ae-t/\tau The Attempt at a Solution I know...

I am still lost...

I am working on the same problem, I don't understand what to do for post #10 and beyond. Can someone please help me!

Speed of wave in string: v = \sqrt{\frac{T_s}{\mu}} Ts = 100N \mu = 0.0012kg/m v = 288.7 Fundamental Frequency: F0 = \frac{v}{\lambda_0} \lambda0 = 2L = 2*1.2 \lambda0 = 2.4 f0 = \frac{\sqrt{\frac{T_s}{\mu}}}{2L} In the air: \lambda = \frac{v}{f_0} \lambda =...

Homework Statement A 120 cm-long steel string with a linear density of 1.2 g/m is under 100 N tension. It is plucked and vibrates at its fundamental frequency. What is the wavelength of the sound wave that reaches your ear in a 20 \circC room? Homework Equations Fundamental...

Homework Statement Astronauts visiting Planet X have a 2.5 m-long string whose mass is 5.0 g. They tie the string to a support, stretch it horizontally over a pulley 1.8 m away, and hang a 1.3 kg mass on the free end. Then the astronauts begin to excite standing waves on the string. Their...

I replaced the numerator Delta t0 with the proper lifetime. My answer is 2.599 x 10-5 seconds. Is this correct??

O should I be using the equation: K =( g - 1 )MC2 or K= (1/2)gMV2 ? What is the correct formula for calculating kinetic energy when a particle's speed approaches the speed of light??

Homework Statement A proton is traveling with a speed of v = 2.993x108 m/s. Calculate the value of the inertial mass for this proton. Assume that the speed of light is c = 3.000 x 108 m/s and that the mass of the proton is 1.673 x 10-27 kg. Note: Do your calculations to 4 significant...

Homework Statement A proton is traveling with a speed of v = 2.990x108 m/s. Calculate the (relativistically correct) value of the kinetic energy for this proton. Assume that the speed of light is c = 3.000 x 108 m/s and that the mass of the proton is 1.673 x 10-27 kg. Note: Do your...

Homework Statement A muon is traveling with a speed of v = 2.995x10^8 m/s. Calculate the value of the dilated lifetime for this muon. Assume that the speed of light is c = 3.000 x 108 m/s and that the proper lifetime of the muon is 1.500 x 10-6 s. Note: Do your calculations to 4...

0.75? 3/4?

Homework Statement Five trumpet players have a sound intensity level of 75dB. What would be the sound intensity level of 30 such trumpet players? _______dB Homework Equations Increasing the sound intensity by a factor of 10 results in an increase in perceived loudness by approx. a...

Oh! thank you so much kuruman!

Thank you, I was able out to figure out the problem last night by following a post on yahoo. I want to post it step by step here for other stumped students: Part B. Determine the amplitude. w = 2(pi)f w = 2(pi)(2.0Hz) w = 12.6 rad/sec v = w Sqrt(A2-x2) -0.30 = (12.6rad/sec) Sqrt[ (A2)...

I honestly have no idea

Homework Statement A small earthquake starts a lamppost vibrating back and forth. The amplitude of the vibration of the top of the lamppost is 6.5 cm at the moment the quake stops, and 8.0 seconds later it is 1.8 cm. A. What is the time constant for the damping of the oscillation? _____...

Homework Statement A 200g mass attached to a horrizontal spring oscillates at a frequency of 2.0 Hz. At one instant, the mass is at x=5.0cm and has vx = -30cm/s. A. Determine the period. T= ____seconds B. Determine the amplitude. A =____cm C. Determine the maximum speed. vmax =...

The answer is 3200 Pa. However, I do not know how to arrive at that solution. I'd reallllyyyyy appreciate it if someone could walk me through it, step by step.

I was not able to get the answer before my assignment was due, the answer was 8.2E5 Pa. But thank you, I really appreciate your help.

What do you mean by gauge pressure is relative to P? Do you think that I am on the right track with the progress I've made? P1=P2+49806

Correct, a numerical value in Pascals. I think I need to incorporate the length of each section as well, not sure how though.

Thank you so much for replying! So I plugged in everything that I calculated so far and ended up with: P1 = P2 +49805 I can't figure out how to find the pressure in the smaller diameter tube so I can plug that in. I know it should be easy...I have the flow rate and the diameter, but I'm stuck...

College Physics Homework Statement The figure shows a section of a long tube that narrows near its open end to a diameter of 1.0mm. Water at 20celsius flows out of the open end at 0.020 L/s What is the gauge pressure at point P, where the diameter is 4.0mm...

College Physics Homework Statement The figure shows a syringe with a 4.0-cm-long needle, filled with water at 20celsius. What is the gauge pressure of the water at the point P, where the needle meets the wider chamber of the syringe...