KINETIC/POTENTIAL ENERGY
4. What is the kinetic energy of a 1500 kg car going at suburban speed of 14m/s? (KE="mv²)
5. A 95 kg anvil is about to fall from 0.9 m high bench. What is the PE? (PE= mgh) (g=9.8 m/s²)
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KINETIC/POTENTIAL ENERGY
4. What is the kinetic energy of a 1500 kg car going at suburban speed of 14m/s? (KE="mv²)
5. A 95 kg anvil is about to fall from 0.9 m high bench. What is the PE? (PE= mgh) (g=9.8 m/s²)
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Problem:
What is the kinetic energy of a 1500 kg car going at suburban speed of 14m/s?
Given:
Formula:
The formula for kinetic energy is KE = 12 mv² where KE is kinetic energy, m is mass and v is the velocity. The unit for kinetic energy is the joule.
Solution:
Answer:
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Problem:
A 95 kg anvil is about to fall from 0.9 m high bench. What is the PE?
Given:
Formula:
The formula for potential energy is PE = mgh. Where PE is potential energy, m is mass, g is the gravity and his height. The unit for potential energy is the joule.
Solution:
Answer:
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ANSWER:
1.) KE = 1/2 mv²
KE = 1/2 (1500kg)(14 m/s)²
KE = 750 kg (196 m²/s²)
KE = 147,000 kg m²/s²
= 147,000 N • m
* N • m = J
KE = 147,000 J
2.) PE = mgh
PE = 95 kg × 9.8 m/s² × 0.9 m
PE = 931 kg. m/s² × 0.9 m
PE = 837.9 J