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?

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Presentation transcript:

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?

2/14/11

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

 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?

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

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 What is the apparent weight?

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.

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

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

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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