- First set of electronic homework problems has been assigned. Please go to mastering phyics website to submit your solution.
- First written homework to be turned in on Tuesday, Feb. 5:
Jose, whose mass is 75 kg, has just completed his first bungee jump and is now bouncing
up and down at the end of the cord. His oscillations have an initial amplitude of 11.0 m and a
period of 4 sec : a) what is the spring constant of the bungee cord? b) What is Jose's maximum
speed while ocillating? c) What is the total potential energy in the spring when Jose is at the lowest
point? d) From what height above this lowest point did Jose jump?
- Here are the solutions to homework number one
- Second week written homework: chapter 15: prob. 75, you have to give details of the derivation to get credit. Turn in on Thursday, Feb. 14
- Here are the solutions to homework number two
- Third week written homework: chapter 20: prob. 72, you have to give details of the derivation to get credit. Turn in on Tuesday, Feb. 19
- Here are the solutions to homework number three
- Fourth week written homework: Due on thursday, Feb 28.
Consider sound waves of the same frequency and the same amplitude (denoted by A) emitted
along the x-axis by two loudspeakers. When speaker 2 is 20 cm behind speaker 1, the sound
intensity is minimum. As speaker 2 is moved forward, the intensity increases and first reaches
maximum, with amplitude 2A, when it is 60 cm in front of speaker 1.
(i) Determine the wavelength of the sound
(ii) What is the phase difference between the two loudspeakers?
(iii) If the speakers are placed side by side, then what will be the amplitude of the sound?
- Here are the solutions to homework number four
- Fifth week written homework: Due on tuesday, March 4.
be Consider ten grams of nitrogen gas at an initial pressure of
6.0 atm and at room temparature. It undergoes an isobaric expansion
resulting in a quadrupling of its volume. \\
(i) After this expansion, what is the gas volume? \\
(ii) Determine the gas temperature after this step. \\
In the next process, the gas pressure is decreased at constant
volume until the original temperature is reached. \\
(iii) After this decrease in gas pressure, what is the value
of the pressure? \\
In the final process, the gas is retured to its initial
volume by isothermally compressing it. \\
(iv) Determine the final gas pressure. \\
(v) Using appropriate scales on both axes, show the full three-step process
on a $pV$ diagram.
- Here are the solutions to homework number five
Sixth week written homework: Due on Tuesday, March 25.
Consider 6.0 g of helium at 40 degree C in the form of a cube
40 cm. on each side. Suppose 2000 J of energy are transferred to this gas.
(i) Determine the final pressure if the process
is at constant volume.
(ii) What is the final volume if instead the process is at constant
pressure?
(iii) On a single pV diagram, show and label both processes.
- Here are the solutions to homework number six
Seventh week written homework: Due on Tuesday, April 1.
- Consider 4 times 10^{ 22 } (10 to 22) atoms of neon at a temperature of
100 degree C contained in a 20-cm-diameter, 40-cm-long
cylinder.
(i) How many atoms are present per unit volume?
(ii) Determine the root-mean-square speed.
(iii) Calculate the rms value of the
x-component of the velocity, i.e., v_x (v sub-x) average.
(iv) At what rate do the atoms collide with one end
of the cylinder?
(v) Using the results of kinetic theory (i.e., the macro/micro connection),
calculate the pressure in the cylinder.
(vi) Does the result in (v) above agree with the pressure determined
using the ideal gas law?
- Here are the solutions to homework number seven
Eighth week written homework: Due on Tuesday, April 8
- Problem 64 at the end of chapter 19
- Here are the solutions to homework number eight
- Ninth week written homework: Due on Tuesday, April 15
- Problem 66 at the end of chapter 25
- Here are the solutions to homework number nine