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Answer:
Explanation:
The toothbrush as we know it today was not invented until 1938. However, early forms of the toothbrush have been in existence since 3000 BC. Ancient civilizations used a "chew stick," which was a thin twig with a frayed end. These 'chew sticks' were rubbed against the teeth
Answer:
Explanation:
The gravitational potential energy can be found using the following formula
Where <em>m</em>= mass, <em>g</em>= gravitational acceleration, and <em>h </em>= height.
We know the the mass of the woman is 70 kilograms and the height is 3,940 meters
If we assume this parachute is on Earth, then the gravitational acceleration is 9.8 m/s²
Substitute the values into the formula.
Multiply the first two numbers first.
- 1 kg*m/s² is equal to 1 Newton. Therefore, the first number (686 kg*m/s²) is also equal to 686 Newtons
Multiply again.
- 1 Newton meter is equal to 1 Joule. So, our answer of 2702840 N*m is equal to 2702840 J
The potential energy of the women is<u> 2,702,840 Joules </u>