1. John has an object suspended in the air. It has a mass of 10 kilograms and is 50 meters above the ground. How much work would the object do if it was dropped?

2. 2/14/11

3.  Calculating energy  Conservation of energy  Types of energy  Work-Energy Theorem  Power  Efficiency  Simple machines

4.  A 20 kg sample of water is cooled from 90˚C to 40˚C. If the specific heat of water is 4180 J/kgC, how much heat did the water gain or lose?

5.  Thermal energy  Temperature  Thermal equilibrium  Heat transfer  Phase changes

6. 1. What is the buoyant force exerted on a steel object with volume 2x10 -3 m 3 floating in crude oil? The density of crude oil is 900 kg/m 3 and the density of steel is 7850 kg/m 3. 2. What is the apparent weight?

7. 1. What is the buoyant force exerted on a steel object with volume 2x10 -3 m 3 floating in crude oil? The density of crude oil is 900 kg/m 3 and the density of steel is 7850 kg/m 3.

8.  Properties of fluids  Archimedes Principle  Density  Pressure  Pascal’s Principle  Hydraulic lifts  Buoyant force  Linear expansion

9.  Open up to your Do Now’s for this week and wait for further instructions

10. 1. What type of image did you see? 2. Was it made by a mirror or a lens? 3. Was it concave or convex? 4. Was the image enlarged or reduced? 5. Was the image inverted or erect?

11. A 2.25 cm object is 8.5 cm to the left of a concave mirror of 5.5 cm focal length. 1. Find the image position 2. Find the image height