68. Ağırlığı ve sürtünmeleri önemsiz makaralarla kuru- lan şekildeki düzenekte W ağırlıklı yükler şekildeki gibi dengededir. F₁ F₂ F W W W W Buna göre, kuvvetlerin büyüklükleri F₁, F₂ ve F3 arasındaki ilişki nedir? 2
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- 5. The number densityN/Vof gas molecules at a certain location in the space above our planetis about 1.00×1011m−3, and the pressure at the same location is 2.75×10−10N/m2. Whatis the temperature there?3. Suppose a planet has a surface temperature of 500 °K. (a)What is the total emission from the planet's surface (Wm²) over all wavelengths assuming it emits as a blackbody? (b) What is the wavelength of maximum emission for this planet? (c) Assume Earth has an average surface temperature of 300°K and emits as a black body. Earth's total emission would be what percent of that of the other planet? (d) What would the emissivity of the other planet have to be to have the same total emission as earth? (e) What would the brightness temperature of the other planet be in (a) and in (d)?2. A sample of rubidium gas of volume 1 × 10-8 cm³ is cooled until it forms a Bose-Einstein condensate. At a temperature of 250 nK, half of the rubidium atoms are in the condensate. (a) Calculate the number of rubidium atoms in the sample. (b) Describe the apparatus that can be used to create this Bose-Einstein condensate.
- 7. Calculate the mass of nitrogen present in a volume of 3000 cm' if the gas is at 22.0 °C and the absolute pressure of 2.03 ×10* Pa is a partial vacuum easily obtained in laboratories. (a) 6.95 ×10 kg; (b) 6.95 ×10* kg; (c) 6.95 ×1012 kg; (d) 6.95 ×10-16 kg. 8. Materials in which the electrons are bound very tightly to the nuclei and do not move freely are referred to as (a) Insulators; (b) Conductors; (c) Semiconductors .Determine energy needed to heat 1 kg of a material. Given info: the material density and change of temperature.Q1. Compute potential difference in thermal equilibrium between region where no = 1017 cm-3 and n, = 1015 cm-3 (Si). Q2. Compute potential difference in thermal equilibrium between region where Po = 1020 cm-3 and Po = 1016 cm-3 (Si).
- 13. A hot sphere of radius 0.040 m and an emissivity of 0.80 has a surface temperature of 500 K. How much energy would it radiate in 1 minute (Answer: Q = 855 J)At "low" temperatures, the heat capacity of some materials varies with temperature as 3 12π¹ NkB T C (T) ² (£) ². 5 Here N is the number of atoms, kB is Boltzmann's constant, and Tp is the "Debye temperature," which is different for different materials. For example, 2300 K for diamond, which is particularly high. TD = How much energy would it take to raise the temperature of one mole of diamond from 100 K to 300K? O 150 Joules. 60 Joules. O 319 joules. O 630 Joules.2. Now show that the continuity equation in cylindrical coordinates in 3 dimensions becomes: * + 1 (r pu) + t (pv) + (pw) = 0 1 д r d0 (ри) — 0 Ət r dr az
- O Mail - Susan Christine Chest X A PHY252HW#4 - PHY 252, se x G -site:chegg.* -site:study." W x W. Final Practice - MAT 273 FA W ae4704ebd4f89eb32c0b17a x WA PHY252Test#4 - PHY 252, sE X W c6600188655bfdb63ba6adi b My Questions | bartleby + -> A webassign.net/web/Student/Assignment-Responses/submit?dep=24839105&tags=autosave#question4167307_11 : Apps Sy integral of x^3 - Int. G Google O abtech20 L electrical review personal O (78) patrickJMT - Yo. D YouTube L recovery M Gmail 4.4736 12. [0/2 Points] DETAILS PREVIOUS ANSWERS SERPSE10 38.6.OP.016. MY NOTES ASK YOUR TEACHER As shown in the figure below, a galactic patrol spacecraft traveling at a speed of u = 0.940c relative to the Earth is pursuing an enemy spacecraft moving away from the Earth at a speed of v = 0.845c. Galactic patrol spacecraft Enemy spacecraft (a) Determine the velocity (expressed as a multiple of c) at which the crew on the enemy craft claims the patrol craft is moving. (Indicate the direction with the sign of your…c) Ec1%39х10^9(10C) /(10m)^2— 0.9х10^9n/c Еc2-9x10^9 (20C) /(10m)^2 %3D 1-8 X 10^9 n/c Ec E1 E21. An expensive vacuum system can achieve a pressure as low as 1 x 10-7N/m² at 20 °C. How many atoms are there in a cubic centimeter at this pressure and temperature? The Boltzman's constant k= 1.38 x 10 m²kg/(s²K) -23 Number of atoms: