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Practice Problems

# Practice Problems - 5 Now the dam in question 4 breaks and...

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Practice Problems – you have to figure out which equations to use and how to do it! K.E.=1/2mv 2 P.E.=mhg (where g=9.8 m/s 2 ) 1. Richard wants to know how much potential energy his cat has when it climbs to the top of the tree near his house. The tree is 15 meters high and the cat has a mass of 5 kilograms. How much potential energy does the cat have? 2. John has an object suspended in the air. It has a mass of 50 kilograms and is 50 meters above the ground. How much (and what kind of) energy does the object have? 3. Mrs. Jacobs dropped an object from 10 meters. She knows it did 50 joules of work (had 50 J of energy). How much did it weigh? 4. A dam (on a small river) is holding back 1000L of water from toppling over a 150 m waterfall. How much potential energy does the water have?
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Unformatted text preview: 5. Now the dam in question 4 breaks, and the water is released at a velocity of 1km/s; how much kinetic energy does the water have? 6. 2500kg of confetti is dropped from Central Park Tower on New Years Eve at midnight at a velocity of 1cm/s, what is its K.E.? 7. 5cm of rain fall on 1 ha of a corn farm at a rate of 2m/s. What is the kinetic energy? 8. This farm has high amount of runoff because there are no plants (weeds or cover) between the rows, so ½ of the water runs of at a rate of 1m/s. What is its kinetic energy? 9. 1 cm of rain fell as a light drizzle at a velocity of 1cm/s over 2.5ha. What is its Kinetic Energy? 10. A 250 kg race car speed around a track at a velocity of 360 km/hr. What is its Kinetic energy?...
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