A horizontal rectangular piston contains 1.85 mol of a polyatomic ideal gas at a pressure of 1.013x10^5 Pa and a temperature of 322.5 C. The gas within the piston is cooled to 264.0 C. (a) If the piston undergoes an isovolumetric process, what is the change in entropy of the gas? J/K (b) If the piston undergoes an isobaric process inside the chamber, what is the change in entropy of the gas? J/K

A machine having a mass of 80 kg is mounted on springs of total stiffness 877 kN/m with an assumed damping factor of ?=0.25. A piston within the machine has a mass of 1.8 kg. This piston reciprocates with a stroke of 80 mm at a speed of 3000 rpm. The motion of the piston is assumed to be simple harmonic, and parallel to the axis of the springs. Determine the amplitude of the machine vibration resulting from the motion of the piston, and also the phase angle between the motion of the piston and the response of the machine. What will be the amplitude of vibrations:

1. When ξ=0
2. When ξ=0.25 and r=1.0

A 515-Hz tuning fork is struck and placed next to a tube with a movable piston, creating a tube with a variable length. The piston is slid down the pipe and resonance is reached when the piston is 112.5 cm from the open end. The next resonance is reached when the piston is 82.5 cm from the open end. Round all answers to one decimal place.

Hint (a)

1. What is the speed of sound in the tube?
   v=v=  m/s
2. How far from the open end will the piston cause the next mode of resonance?
   L=L=  cm

33)

(a) A piston at 5.9 atm contains a gas that occupies a volume of 3.5 L. What pressure would have to be placed on the piston to force the volume to adjust to 0.32 L?
_____________ atm

(b) A piston at -44.0°C contains a gas that occupies a volume of 2.5 L. To what temperature would the gas have to be heated to increase the volume to 4.4 L at constant pressure?
__________ °C

(c) A piston at 795 torr contains a gas that occupies a volume of 4.7 L. What pressure would have to be placed on the piston to force the volume to adjust to 0.78 L?
___________atm

The United States is one of the nations in the world with the highest number of Economists. They are even some Economic Nobel laureates in the country. Why do you think the country goes through recessions from time to time when we have many Economists? Why did they not prevent the recession of 2007 – 2012 in the first place? Make sure to include some references at the end of the answer. Thank you.

The United States is one of the nations in the world with the highest number of Economists. They are even some Economic Nobel laureates in the country. Why do you think the country goes through recessions from time to time when we have many Economists? Why did they not prevent the recession of 2007 – 2012 in the first place? Make sure to include some references in your answers.

answers to the questions in about 2 paragraphs Please

A hospital employee is transporting a patient to the imaging department for a CT scan. After pushing the gurney into the elevator, the employee drops an item and bends over to pick it up as the elevator doors are closing. The employees head is struck by the elevator and the employee is injured. Evaluate whether or not this incident needs to be reported and investigated. Justify your answer?

( we need to answer and justify if this incident needs to be reported and investigated?

A person with mass m= 70 kg takes the elevator to the top of the Empire State Building at a height of 300 m. Assum the elevator takes 1 min to reach the top of the building

(a) Find the work done on the person by gravity during the elevator ride?

(b) Find the amount of work the normal force of the floor did on the person.

(c) Find the average power of the force of gravity.

How do you play Chicago? There are eleven rounds in the game, one for each combination that can be made by adding two dice, namely the numbers two through 12. Each round has a target combination starting with two and going up all the way to 12. Going clockwise, the players take turns to roll both dice one time. If players roll the target combination, then they score points equal to the target combination, otherwise they score zero. For example, if the round corresponds to target combination six, then the player scores six points if the two dice add up to six. Else, the player scores no points. The player with the highest score at the end of the eleventh round wins the game.

If the player wins a dollar for every point, he/she gets and losses three dollars for getting no points, what are the expected winnings or losses on each turn?

How do you play Chicago? There are eleven rounds in the game, one for each combination that can be made by adding two dice, namely the numbers two through 12. Each round has a target combination starting with two and going up all the way to 12. Going clockwise, the players take turns to roll both dice one time. If players roll the target combination, then they score points equal to the target combination, otherwise they score zero. For example, if the round corresponds to target combination six, then the player scores six points if the two dice add up to six. Else, the player scores no points. The player with the highest score at the end of the eleventh round wins the game.

If the player wins a dollar for every point, he/she gets and losses three dollars for getting no points, what are the expected winnings or losses on each turn?