The Objective of This Practice Set Is to Learn How to Calculate Kinetic Energy

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KINETIC ENERGY

ANSWER QUESTIONS ON A SEPARATE PIECE OF PAPER.

The objective of this practice set is to learn how to calculate Kinetic Energy.

1. In 1994, Leroy Burrell of the United States set what was then a new world record for the men’s 100m run. He TIFF (Uncompressed)QuickTime™ and ran decompressora the distance in 9.85 s. Assuming that he ran with a are needed to see thisconstant picture. speed equal to his average speed, and his mass was 66 kg, what was his kinetic energy when he crossed the finish line?

2. The fastest helicopter, the Westland Lynx, has a top QuickTime™ and a 2 TIFF (Uncompressed) decompressor speed of 4.00 x 10 km/hr (Hint: What is this in m/s?) are needed to see this picture. If its kinetic energy at this speed is 2.10 x 107 J, what is the helicopter’s mass? (1 km/hr = .278 m/s.)

3. Dan Jansen of the United States won a gold medal at the QuickTime™ and a TIFFare (Uncompressed)needed to see thisOlympics decompressor picture. at Lillehammer, Norway in 1994. He did this by skating 500 m with an average speed of 50.3 km/hr. If his kinetic energy was 6.54 x 103 J, what was his mass?

4. In 1995, Karine Dubouchet of France reached a record TIFF (Uncompressed)QuickTime™ and decompressor a speed in downhill skiing. If Dubouchet’s mass was 51.0 are needed to see this picture. kg, he kinetic energy was 9.96 x 104 J. What was her speed?

5. The brightest, hottest, and most massive stars are the brilliant blue stars designated as spectral class O. If a class O star with a mass of 3.38 x 1031 kg has a speed of 6.5 x 1010 m/s, what is its kinetic energy?

6. The male polar bear is the largest land-going predator. It s height when standing on its hind legs is over 3 m, and QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture.its mass can be as great as 680 kg. In spite of this mass, it can run at speeds up to 56 km/hr. a. How much kinetic energy would a running bear have? b. Compare this to the kinetic energy of Leroy Burrell.

7.Escape speed is the speed required for an object to leave the earth’s orbit. The escape speed for an object launched from earth is 11200 m/s. Suppose a meteor is QuickTime™ and a TIFFare (Uncompressed)needed to see this decompressor picture. pulled to the earth’s surface, and collides with the earth with a speed equal to this escape speed. If the meteorite (now that it has hit the earth) has a mass of 2.3 x 105 kg, what is its kinetic energy at the instant that it strikes the surface?