Energy Introduction

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•If the earth was 9 mm in radius, it would be a Black hole •This is the Schwarzchild radius: roughly the black hole radius James Watt Peter Watson • Beam engine was first efficient steam engine • enabled the industrial revolution One more related idea: Momentum • Stopping a tennis ball is easy • Stopping a medicine ball isn’t easy Wikipedia <strong>Energy</strong> ≠ Power (but they are related) • Power = rate of energy consumption (or rate of energy production) • 1 watt = 1 Joule/second • Light-bulb ~100W • You (from food) ~ 100 W • Laptop~50 W • Car (at 60 km/hr) ~ 40 kW • From sun: 1.4 kW/m 2 • Total ~300 GW • Electrical ~60GW • per capita ~ 10 kW Canada Roughly! • Note (very confusingly) a kilo-watt hour is a unit of energy not power • 1 kWh = 3600 x 1000 J = 3.6 MJ • Momentum • p = mv • = mass ×velocity • To stop an object requires • force×time • (can supply a large force for a short time, all small force for a long time)
1.Kayla Kennedy 2.Question: How do airplanes fly? 1.Why it’s a good question: Air travel is increasingly commonplace – this question would likely interest the class. Personally I have always wondered about it myself; imagining the thinness of the atmosphere, the immense weight of the plane and the strength of gravity, it seems impossible. 2.Scale Rating: Likely a 2 or a 3. A 2 for my professor and a 3 for myself. Air strikes the wing And is deflected downwards Change in momentum produces a force which lifts the bird/plane Reality is (a lot!) more complicated! 1.Alizehi Alvi 2. What would be the best shape for an aircraft that does horizontal travel , i.e travels to the moon 3.What is required for an aircraft that needs to travel to space. There have been a few failed space missions so what kind of improvements could be made to the current design Since there is no atmosphere in space it probably doesn't need to have a streamlined aerodynamic shape. Space ships in movies are disk shaped how far off is that from an actual ideal design for space travel ? Text 1.) Julie Stemmler What keeps birds aloft? 1.There must be answers to this question other than the fact that birds can fly and stay aloft simply because they have wings and light hollow bones. Though it may be true that this would give them an advantage in overcoming gravity there must be more to this answer. However, there is a large discrepancy between the weight and design of a bird’s physical structure and that of an airplane. Therefore there must be other factors that come into play to cause a bird or any flying aircraft to remain in flight. What are those factors and how do they work? • Two separate problems Wikipedia • Flying through atmosphere requires wings to provide, lift • Must reduce drag Dick Hallion
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Energy Introduction

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