You just dont lie and I will answer your question
Erosion is caused by human activities like excessive construction, agriculture, surface mining and forestry. Removing the vegetative cover accelerates erosion, which is often caused by grazing, logging or cultivating. In some cases, it can be removed by pests like pigs, rabbits and goats.
The vacuum cleaner's efficiency is calculated as 37.5%. This is determined by the ratio of useful energy output (45J) to total energy input (120J). Real-world devices typically have efficiencies less than 100% due to energy losses.
The vacuum cleaner's efficiency can be calculated using the formula: Efficiency = (Useful energy output / Total energy input) x 100%. In this scenario, the vacuum cleaner used a total of 120 joules of electrical energy, but only 45 joules of that energy were used for the useful task of pulling in air. Therefore, the vacuum cleaner's efficiency would be calculated as: Efficiency = (45 J / 120 J) x 100% = 37.5%.
It's important to understand that real machines do not achieve 100% efficiency because some energy is always lost as heat due to friction and air resistance. As such, the vacuum cleaner's efficiency of 37.5% fits within expected bounds for real-world devices.
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Answer:
2.5 m/s
Explanation:
Mechanical energy is the sum of the potential and kinetic energy.
E = PE + KE
E = mgh + ½mv²
172.1 J = (7.26 kg) (9.8 m/s²) (2.1 m) + ½ (7.26 kg) v²
v = 2.5 m/s
Answer:
2.5 m/s
Explanation: i jus did this on edg. its right:)
Homework due tomorrow!
Last question!!!!!
Answer:
- You see lightning before you hear thunder.
- You see a rock fall before you hear its sound.
Explanation:
Brainliest???