Module 1 Assignment
One human heartbeat uses about how much energy?
1 joule
What are our 8 guidelines for making an order of magnitude estimate?
1. Guess 2. Talk to your gut 3. Divide and conquer 4. Lie skillfully 5. Punt 6. Use guerrilla warfare 7. Lower your standards 8. Cross check
A 15 kilogram eagle is flying at 20 meters/sec. What is the kinetic energy (in joule) of the eagle? Use exact numbers; do not estimate.
3,000
A 116 Watt light bulb is turned on for 1 minute. How much energy, in Joule, is used? Use exact numbers; do not estimate.
6,960
What is energy?
Energy is the capacity to do work.
Work, in the technical sense of the word, has units of...
Joules
Select items that are forms of energy
Kinetic, Potential, Gravitational
A vector has these properties
Magnitude Direction
How is mass related to weight?
Mass is is a fixed quantity of matter. Weight depends on the forces acting on a mass.
Work is...
a force times a distance. the transfer of energy.
A force is in the...
direction of the change in motion.
A force is...
is responsible for a change in motion. is a mass times an acceleration.