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!!

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Presentation transcript:

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)How do we make cities sustainable?

1) How do we make cities sustainable/liveable?. Answer: They may vary, but here are some good ideas. 1)Improve Mass Transit 2)Make buildings more efficient 3)Preservation of historic and natural assets 4)Boost clean energy 5)Upgrade power infrastructure The world's cities occupy 4 percent of the Earth's land area, yet they are home to more than half of the world's people.more than half of the world's people.

What are we doing Today? Hand in late assignments/labs? Question(s) of the day Ch. 3 – EST Notes Class work questions Everyone gets an environment text Get back Chapter 2 Test (ST)

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 Use the table on p.75 of your textbook to help 1)A beaker containing 200 grams of Sand is heated from 24 to 44 degrees celsius. 2) A beaker containing 100 grams of Ethanol is cooled from 50 to 20 degrees celsius.

1) A beaker containing 200 grams of Sand is heated from 24 to 44 degrees celsius. Answer: 3200 Joules. Positive answer. Substance has absorbed heat A beaker containing 100 grams of Ethanol is cooled from 50 to 20 degrees celsius. Answer: Joules. Negative answer. Substance has given off heat

Kinetic energy is the energy an object possesses due to its motion (p. 76).

The kinetic energy of an object depends on its mass and speed (p. 76).

Practice 1)What is the kinetic energy of Jonah’s car that weights 4000 Kg and travels at 22 m/s ? 2)Calculate the kinetic energy of a bus that weighs Kg and travels at 50 km/hr ?

1)What is the kinetic energy of Jonah’s car that weights 4000 Kg and travels at 22 m/s ? Answer: Joules 2) Calculate the kinetic energy of a bus that weighs Kg and travels at 50 km/hr ? Answer: Joules

Gravitational potential energy is the energy reserve of an object based on its mass and its height above a reference surface (p. 77). Ep = mgh Ep = gravitational potential energy in J m = mass in Kg g = 9.8 N/Kg h = height in metres

Practice 1)What is the gravitational potential energy acquired by a 5 Kg rock raised to a height of 2 metres? 2)What is the gravitational potential energy acquired by a 2 Kg rock raised to a height of 3 metres?

Ep = mgh 1) What is the gravitational potential energy acquired by a 5 Kg rock raised to a height of 2 metres? Answer: 98 Joules 2) What is the gravitational potential energy acquired by a 2 Kg rock raised to a height of 3 metres? Answer: 58.8 Joules

The sum of the kinetic and the potential energy is the mechanical energy of a system (p. 78).

What to do? Questions page 99 & 100 of your textbook Numbers: 8, 9, 10, 11ab, 12ab