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Question of the Day Rules • You must work alone • You may use your textbook today • You have 10 minutes to complete the QOD Good luck!! Question(s) of the Day 1) Read p.105 of your textbook and answer the following questions. a) Why is it so important to reduce energy consumption? b) Give 3 examples that we can do to reduce our energy consumption in our own homes? Answers .1) Why is it so important to reduce energy consumption? Answer: By reducing our energy consumption, we also reduce our impact on the environment. If we reduce our fossil fuel consumption, we generate less greenhouse gas. If we reduce our hydroelectric demands, we help prevent further flooding of land to build new dams. Answers 2) Give 3 examples that we can do to reduce our energy consumption in our own homes? Answers will vary. Examples: turning off the lights when we leave a room – turning down the heating at night and when we are away from home – using energy-efficient appliances – insulating our homes better. What are we doing Today? • Hand in assignment (Nuclear EST) • Question(s) of the day • Practice Problem from HW • Ch. 3 (ST) Test Nov. 12 • Ch. 3 – EST Notes Motion & Forces • Class work questions • Get back Chapter 2 Test (EST) The specific heat capacity corresponds to the amount of thermal energy required to raise the temperature of one gram of a substance by one degree Celsius (p. 74). Where: change in T = Tf - Ti Practice Question • What final temperature will be attained by a 250 ml cup of 10 oC water if it absorbs 1000 J of heat? 1ml = 1g Note, because water's density = 1g/mL, 250 mL = 250 g Q = m c ΔT 1000 J = 250(4.19) (x - 10) x - 10 = 1000 /250/4.19 x - 10 = 0.95 x = 10 .95 oC Another One for Fun • Ravi puts a 100-g block of lead, heated to 155C, in 100 mL of water at 19C. The water temperature rises to 24C. Assuming no energy has been lost to the surroundings, calculate the specific heat capacity of lead. The main variables in the description of motion are speed (or velocity), travel, time and acceleration (p. 79). V = d/Δt V = average speed (in meters/second) D = the distance travelled (in meters) Δt = the travelling time (seconds) Practice 1) What is the average speed of Mr. Meades car that travels 25 km in 14 minutes? V = d/Δt 1) What is the average speed of Mr. Meades car that travels 25 km in 14 minutes? Answer: 25000 meters/840 seconds = 29.76 m/s What is the answer in km/hour ? Answer: 107.2 km/hr A force is an action that can change the motion of an object, or deform the object, by pushing or pulling on it (p. 80). Force is measured in Newtons Michael Jordan Vs. Isaac Newton A force is always exerted by one body on another, and in one direction (p. 80). There are four main types of forces: gravitational force, electromagnetic force, strong nuclear force and weak nuclear force (p. 81). At the earth’s surface, all objects in free fall are subject to a force causing them to accelerate at a rate of 9.8 m/s2 Explained Mass is a measure of the quantity of matter in an object (p. 83). -Does not matter where the mass is measured. Jonah has a mass of 78 Kilograms on earth and Jonah has a mass of 78 Kilograms on the moon. Weight is a measure of the gravitational force acting on an object (p. 83). Classwork From your textbook page 100-101 Numbers: 13, 14, 16, 17, 19 Don’t forget Ch. 3 (ST) Test on November 12 Tutorial on Monday after school Homework Check Time 1) P.39-40 in your workbook. 2) P.99-100 of Textbook 8, 9, 10, 11ab, 12ab