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by: Eric Doman

2

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37

# week 2 PHY206

Eric Doman
UM
GPA 4.0

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week 2
COURSE
Physics 2
PROF.
Kenneth Voss
TYPE
Class Notes
PAGES
37
WORDS
CONCEPTS
Physics
KARMA
25 ?

## Popular in Education, Physics

This 37 page Class Notes was uploaded by Eric Doman on Saturday October 1, 2016. The Class Notes belongs to PHY206 at University of Miami taught by Kenneth Voss in Spring 2016. Since its upload, it has received 2 views. For similar materials see Physics 2 in Education, Physics at University of Miami.

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Date Created: 10/01/16
Physics 206  Monday 1/20/16 14.6-14.7 Continuity Bernoulli’s Equation Lecture 4 Today we will show how/why How to calculate water pressure in house. Airplane wings work Why Shower curtains bend in Two cups are filled to the same level with water. One of the two cups has ice cubes floating in it. When the ice cubes melt, in which cup is the level of the water higher? 1. The cup without ice cubes. 2. The cup with ice cubes. 3. It is the same in both. Two cups are filled to the same level with water. One of the two cups has ice cubes floating in it. Which weighs more? 1. The cup without ice cubes. 2. The cup with ice cubes. 3. The two weigh the same. Water ﬂows through a 1-cm diameter pipe connected to a ½-cm diameter pipe. Compared to the speed of the water in the 1-cm pipe, the speed in the ½ -cm pipe is: a) one-quarter b) one-half c) the same d) double e) four times How is the smoke drawn up a chimney affected when there is a wind blowing outside? a) smoke rises more rapidly in the chimney b) smoke is unaffected by the wind blowing c) smoke rises more slowly in the chimney d) smoke is forced back down the chimney Example use of Bernoulli’s law Aspirator (water pump) Water in Suction Flow Out (atmospheric pressure) Worked Problem 15.63 A Garden hose is attached to a water faucet at one end and a spray nozzle at the other end. The water faucet is turned on, but the nozzle is turned off so that no water flows through the hose. The hose lies horizontally on the ground, but has a leak and water streams vertically out of the leak to a height of 0.70 m. What is the pressure inside the hose? When a hole is made in the side of a container holding water, water flows out and follows a parabolic trajectory. If the container is dropped in free fall, the water flow A. diminishes. B. stops altogether. C. goes out in a straight line. D. curves upward. Worked problem 15.65 Find the pressure difference on an airplane wing if air flows over the upper surface with a speed of 115 m/s and along the bottom surface with a speed of 105 m/ 2 s. If the area of the wing is 32 m , what is the net upward force on the wing? Fun problem Every Sunday I fill my water bottle before golf from a water fountain. If I push really hard I can make the water come up 20% higher..How much faster will I fill my water bottle by doing this extra effort? Reading Assignment Friday 1/22/16 18.1-18.2 Monday 1/25/16 18.3-18.4 1/22/16 Today we will learn The physical law which defines temperature : Physics 206  How a constant volume Friday 1/22/16 thermometer works 18.1-18.2 th 0 Law of thermodynamics Temperature scales Lecture 5 Bernoulli Thermal equilibrium Suppose a pitcher wants to throw a baseball so that I can prove the zeroth law of thermodynamics by: it rises as it approaches a batter. If the ball is being A) measuring the pressure of a gas and showing it thrown from left to right, how should the ball be spinning? goes to 0 K when the pressure goes to zero. B) putting object A into contact with object B, with no temperature change of either object, then object B into contact with object C, with no temperature change of either object, then placing object A into A) clockwise B) counter clockwise contact with object C and measuring the temperature change. C) no spin C) One can’t “prove” a law of physics. 1 1/22/16 Which one of the following situations is described by the zeroth law of thermodynamics? Which is the largest unit: a) An air conditioner transfers heat from the inside of a house to the outside of the house. one Celsius degree, one Kelvin degree, or one b) A monatomic gas is held within a container that has a moveable piston. The gas absorbs heat from the surroundings and expands at constant pressure and Fahrenheit degree? temperature. c) A container with insulating walls holds boiling water. A thermometer is calibrated by a) one Celsius degree inserting it into the boiling water and allowing it to reach thermal equilibrium with the water. b) one Kelvin degree d) A pot contains oil at 175 °C. When frozen sliced potatoes are dropped into the oil, c) one Fahrenheit degree heat is transferred from the oil to the potatoes. d) both one Celsius degree and one Kelvin e) A physicist removes energy from a system in her laboratory until it reaches a temperature of 3 xK, a temperature very close to (but still greater than) degree absolute zero. e) both one Fahrenheit degree and one Celsius degree Unsatisfied with the Celsius and Kelvin temperature scales, you Which one of the following properties is not likely to be used as a decide to create your own. On your temperature scale, the ice temperature-sensitive property to construct a thermometer? point is 0.0 °M and the steam point is at 366.1 °M, where ▯M▯ stands for ▯my scale.▯ What temperature on your scale a) The volume of a liquid increases with increasing temperature. corresponds to 0 K? b) A gas held within a constant volume container exhibits pressure a) -273.1 °M changes with corresponding temperature changes. b) -500.0 °M c) The length of a metal rod changes linearly with temperature. c) -1000.0 °M d) The mass of a solid decreases with increasing temperature. d) -732.4 °M e) The electrical resistance of a wire increases with increasing temperature. e) -633.9 °M 2 1/22/16 Reading Assignment Monday 1/25/16 18.3-18.4 Wednesday 1/27/16 18.4 3 1/25/16 We can apply todays topics to: Expansion joints in bridges Pipes burst Physics 206  Monday 1/25/16 18.3-18.4 There is a “land” or Thermal expansion “sea” breeze Speciﬁc heat They put gaps in rails Lecture 6 Thermal Expansion You may notice that if a mercury-in-glass thermometer is inserted into a hot liquid, the mercury column first drops, and then later starts Brass has a positive coefficient of thermal expansion α (ΔL = α LoΔT). A to rise (as you expect). How do you explain this ring (annulus) of brass is heated. Does drop? the hole in the middle of the ring get a) the mercury contracts before the glass larger or smaller? contracts b) the glass contracts before the mercury contracts A: larger B: smaller C: stays the same c) the mercury contracts before the glass expands d) the glass expands before the mercury expands A is correct answer e) the mercury expands before the glass contracts 1 1/25/16 Worked example Worked example Early in the morning, when the temperature is 5.0 C Early in the morning, when the temperature is 5.0 C water is filled into a 50 liter steel tank until it is filled water is filled into a 50 liter steel tank until it is filled to the top. Later in the day the temperature rises to to the top. The top is fixed tightly to the tank. How 25 C. How much water spills out of the tank? much internal pressure is generated in the tank, if the tank does not expand? Two objects are made of the same material, but Two equal-mass liquids, ini1ally at the same have different masses and temperatures. If the temperature, are heated for the same 1me objects are brought into thermal contact, which over the same stove. You measure the one will have the greater temperature change? temperatures and ﬁnd that one liquid has a a) the one with the higher initial temperature higher temperature than the other. Which b) the one with the lower initial temperature liquid has a higher speciﬁc heat? c) the one with the greater mass a) the cooler one d) the one with the smaller mass b) the hotter one e) the one with the higher specific heat c) both the same 2 1/25/16 The specific heat of concrete is greater than that of soil. A baseball field (with real soil) and the Water has a higher speciﬁc heat than sand. surrounding parking lot are warmed up during a Therefore, on the beach at night, breezes sunny day. Which would you expect to cool off would blow: faster in the evening when the sun goes down? a) from the ocean to the beach b) from the beach to the ocean a) the concrete parking lot b) the baseball field c) either way, makes no difference c) both cool off equally fast Reading Assignment Wednesday 1/27/16 18.4 Friday 1/29/16 18.5 3

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