Question

Problem 2 (9) Use kinetic theory of gasses to explain the following: a) As a glass of water evaporates, what happens to the temperature of the water? b) As a water vapor condenses onto a surface, what happens to the temperature of the vapor? c) As a solid sublimates, what happens to the temperature of the solid? Problem 3 [6] a) 15g of helium at 298K is equivalent to how many moles? molecules? volume? b) 15g of water at 298K is equivalent to how many moles? molecules? volume? Problem 4 [15] a) The average density of a typical iceberg is 0.86 that of seawater. What fraction of an iceberg's volume is submerged? b) Assume the iceberg is a cylinder and has ar = 15m and the total volume, V = 100000m². What is the pressure at the bottom of the iceberg? c) What would the pressure at the bottom of the iceberg be if there is a water current under the iceberg with a speed of 3m/s? Problem 5 [8] a) Describe what would happen to the charges in a neutral rod (Rod A) if charged rod (Rod B) was brought within proximity (but not touch) one end of a neutral rod (Rod A). (Include sketches) b) If Rod A was broken in half during the scenario listed in part a, will the rods be neutral or charged? If charged, explain (+) or (-). If not charged, explain why not. Problem 6 [7] You are tasked with analyzing an old set of data. Unfortunately, a portion of the data has become corrupt and can only access a portion of the data. You read that the system contains 2 charged particles: Particle A: Located at the origin with a = +900 nC. Particle B: Located at {missing data} with a charge of q. = -500 nC. You are given that the net force on particle Ais F = (12 i - 7j) N. Your task: What is the position of particle B? Problem 7 [10] Twe point charges are separated by a distance of 10.0 cm on the x-axis. One has a charge of -25 4C and the other +50 C. a) Determine the direction and magnitude of the electric field at a point P between the two charges that is 2.0 cm from the negative charge. b) If an electron (mass = 9.11 X10-31 kg) is placed at rest at P and then released, what will be its initial acceleration (direction and magnitude)? Problem 8 (15) 4000 grams of water is placed in a vacuum chamber with dimensions of 2m by 2m by 2m at T=40°C. What is the final (ie. equilibrium) pressure inside the system? Assume the water vapor can be modeled as a ideal gas.

Answer 1

Problem 2 - ③ when the water evaporates from the it will take the latent heat- from the wäler of stre glass. so the temporelme water decreases. glass wales When water vapour Condensed onto a surface, Shen heat will released. So the temporetne of vapour increased. She when the solid sublimales it will takes the latent heat from the solid and undergoes the phase transition to the tempareture & the solid decreases Helium I mole = u gran . gu 15 15 Mole 3.75 Mole. 4. 23 24 = 3.75 X 6'023X10 = 2.259X10 Molecule Moreale volume 22.4x3.75 Litre 84 litre.