Net Work & Kinetic Energy Video Lessons

Concept

# Problem: About 50000 years ago, a meteor crashed into the earth near present-day Flagstaff, Arizona. Recent (2005) measurements estimate that this meteor had a mass of about 1.4 108 kg (around 150000 tons) and hit the ground at 12 km/s.You may want to review (Pages 177 - 182). For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Using work and energy to calculate speed.How much kinetic energy did this meteor deliver to the ground?How does this energy compare to the energy released by a 1.0-megaton nuclear bomb? (A megaton bomb releases the same energy as a million tons of TNT, and 1.0 ton of TNT releases 4.184 109 J of energy.)

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About 50000 years ago, a meteor crashed into the earth near present-day Flagstaff, Arizona. Recent (2005) measurements estimate that this meteor had a mass of about 1.4 108 kg (around 150000 tons) and hit the ground at 12 km/s.

You may want to review (Pages 177 - 182).

For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Using work and energy to calculate speed.

How much kinetic energy did this meteor deliver to the ground?

How does this energy compare to the energy released by a 1.0-megaton nuclear bomb? (A megaton bomb releases the same energy as a million tons of TNT, and 1.0 ton of TNT releases 4.184 109 J of energy.)