A centrifuge rotor rotating at 9800 rpmrpm is shut off and is eventually brought uniformly to rest by a frictional torque of 2.22 m⋅Nm⋅N .

Part A

Please Express your answer to three significant figures.

If the mass of the rotor is 3.67 kgkg and it can be approximated as a solid cylinder of radius 0.0640 mm , through how many revolutions will the rotor turn before coming to rest?

Part B

Express your answer to three significant figures and include the appropriate units.

How long will it take?

2.00mole of nitrogen (N2) gas and 2.00mole of argon (Ar) gas are in separate, equal-sized, insulated containers at the same temperature. The containers are then connected and the gases (assumed ideal) allowed to mix. PART A: What is the change in entropy of the system? PART B: What is the change in entropy of the environment? PART C: Repeat part A but assume one container is twice as large as the other.

Cycling. For a touring bicyclist the drag coefficient C1ƒ = 1 CArv22 is 1.00, the frontal area A is 0.463 m^2, and the coefficient of rolling friction is 0.0045. The rider has mass 50.0 kg, and her bike has mass 12.0 kg. (a) To maintain a speed of 12.0 m/s (about 27 mi/h) on a level road, what must the rider’s power output to the rear wheel be? (b) For racing, the same rider uses a different bike with coefficient of rolling friction 0.0030 and mass 9.00 kg. She also crouches down, reducing her drag coefficient to 0.88 and reducing her frontal area to 0.366 m^2. What must her power output to the rear wheel be then to maintain a speed of 12.0 m/s? (c) For the situation in part (b), what power output is required to maintain a speed of 6.0 m/s? Note the great drop in power requirement when the speed is only halved. (For more on aerodynamic speed limitations for a wide variety of human-powered vehicles, see “The Aerodynamics of Human-Powered Land Vehicles,” Scientific American, December 1983.)

An ideal gas with 7 degrees of freedom begins at a pressure of 8.5 atm, temperature of 25 degrees Celsius and volume of 120L.

A) How many moles of gas are there?

B) The gas expands isobarically to 200L. What is the new temperature?

C) How much work was done in the expansion?

D) By how much did the internal energy increase?

E) What amount of heat flowed into the gas?

G) The gas then depressurizes isochorically to the original temperature. How much heat flowed out of the gas?

H) Finally the gas contracts isothermally back to its original volume.

I) How much work was done on the gas in the Sketch this thermal cycle on a PV diagram. contraction?

J) How much heat flowed out of the system?

K) What is the efficiency of this thermal cycle?

L) What is the Carnot efficiency for an ideal heat engine running between the same high and low operating temperatures?

The resistanceless inductor is connected across the ac source whose voltage amplitude is 29.0Vand angular frequency is 1000rad/s . Find the current amplitude if the self-inductance of the inductor is

A) 1.00E^-2 H? (A)

B) 1.00 H? (mA)

C) 100 H? (mA)

Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They initially cost much more, but last far longer and use much less electricity. According to one study of these bulbs, a compact bulb that produces as much light as a 100 W W incandescent bulb uses only 23.0 W W of power. The compact bulb lasts 10000 hours, on the average, and costs $ $ 11.00, whereas the incandescent bulb costs only $ $ 0.75, but lasts just 750 hours. The study assumed that electricity cost $ $ 0.070 per kilowatt-hour and that the bulbs were on for 4.0 h per day.

a.What is the total cost (including the price of the bulbs) to run incandescent bulbs for 3.0 years

b. What is the total cost (including the price of the bulbs) to run compact fluorescent bulbs for 3.0 years?

c.What is the resistance of a "100 WW" fluorescent bulb? (Remember, it actually uses only 23 WW of power and operates across 120 VV.)

A physics lecture room has a volume of 237 m3. (a) For a gas pressure of 1.00 atm and a temperature of 26.0 oC, use the ideal gas law to estimate the number of air molecules in the room. Assume all the air is N2. (b) Calculate the particle density ❝ that is, the number of N2 molecules per cubic centimeter. (c) Calculate the mass of the air in the room.

If the resolution of a spectrograph is Delta lambda = 10^-12 m, would it be able to separate the K(alpha) lines of platinum and gold?

1. In each question: you place mass m on the mass holder, and released the system from rest. The system includes two pulleys and a long rod with two point masses on it. If you increase m, the mass on the mass holder, what happens to the following quantities: - a, the angular accelertion of the pulley and I, the moment of inertia of the pulleys-plus-rod system.

Do they increase, decease, or remain the same?

2.  If you move the two masses attached to the rotating rod away from the center of mass of the rod, what happens to the following quantities:
- a, the angular accelertion of the pulley.
- I, the moment of inertia of the pulleys-plus-rod system.

Do they increase, decease, or remain the same?

A potential difference of 5.00 V will be applied to a 47.00 m length of 18-gauge tungsten wire (diameter = 0.0400 in). Calculate the current.

Calculate the magnitude of the current density.

Calculate the magnitude of the electric field within the wire.

Calculate the rate at which thermal energy will appear in the wire.

Tungsten: 5.28e-8

Some time, delta T, after a rocket blasts off from the surface of earth, it is travelling at a constant speed, and its instantaneous mass(including fuel) is M+20,000kg. The gas ejected out the back of the rocket is moving at a relative velocity of 1,200 m/s (downward), with respect to the rocket. You may assume that the rocket is still very close to the surface of the earth, and that air resistance is negligible. A) What is the rate of fuel consumption at this moment in time? (What rate is the rocket losing mass?) I know the answer is -163kg/s I just dont understand how they got that answer. Thanks!

From the Apollo missions we know that the moon is covered with dust. Where does it come from? Is it from the erosion of the moon rock? By what? Or by accretion of dust from space? Which comes from where?

What is the origin of the term laser?

Throughout history, research in the physical sciences has often been limited by our abilitiesof safely observing and studying the very phenomenon in question. As we make technological progress, we have increasingly more tools to expand our observational capabilities. Write a three to five (3-5) page paper in which you: Part 1: Procedures in the Physical Sciences: Challenges in Measurements Identify three (3) specific challenges to making direct measurements in the fields of astronomy, chemistry, physics, or earth science. Describe how scientists have utilized indirect forms of measure to overcome these challenges. Choose two (2) of the most historically influential tools or techniques in the physical sciences. Explain how these techniques or tools work, and how they helped to advance our understanding of the physical sciences. Part 2: Procedures in the Physical Sciences: A Survey of Safety Choose one (1) hazard associated with research in the physical sciences. Discuss how protective gear or equipment might be used to mitigate the hazard, as well as its efficacy. Describe the ways in which advancements in the physical sciences might impact the safety of the global community. Assess any special considerations for regulating this research. Part 3: Documentation Use at least four (4) quality resources in this assignment. Note: Wikipedia and similar Websites do not qualify as quality resources. The body of the paper must have in-text citations that correspond to the references. Integrate all sources into your paper using proper techniques of quoting, paraphrasing and summarizing, along with proper use of in-text citations to credit your sources.