The power of an object is the rate of work done or energy. Here, the energy used by the hair dryer is 72000 Joules. Hence, the power used by the dryer is 1200 watt.
The power of an object is a physical quantity that, measures the rate of the work done by the object or the energy used by the object. The energy used is equal to the work done by it. Hence both have the same standard unit of joule.
Power is the work done or energy divided by time. Hence, the unit of power is J/s which is equivalent to watt.
hence power = work done or energy / time
Given the energy used by the hair dryer = 72000 Joules
time = 60 seconds.
then, power = 72000 J/60 s = 1200 watt.
Therefore, the power used by the dryer is 1200 watt.
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Answer:
1200 Watts is the answer
A. Force
B. Joules
C. Power
D. Energy
Answer:
C
Explanation:
Wastewater treatment plants have been in existence for about 120 years.
The development of wastewater treatment plants began in the late 19th century, around the 1890s. The need for wastewater treatment arose as industrialization and urbanization led to increased pollution of water bodies due to the discharge of untreated sewage and industrial effluents.
The first modern wastewater treatment plant is often credited to the city of Paris, France, which constructed its first large-scale sewage treatment plant, known as the "Clichy-la-Garenne Sewage Farm," in 1889. This plant utilized biological treatment processes to remove organic matter from wastewater before discharging it into the Seine River.
Over the following decades, the importance of wastewater treatment became recognized, and more cities and municipalities around the world started investing in the construction of wastewater treatment plants. The development and advancement of treatment technologies continued throughout the 20th century, leading to more efficient and effective treatment processes.
Today, wastewater treatment plants play a critical role in protecting public health and the environment by treating and purifying wastewater before it is discharged back into natural water bodies or reused for various purposes. These plants use a combination of physical, chemical, and biological processes to remove pollutants and contaminants, ensuring that the water released is safe for the environment and human use.
In summary, wastewater treatment plants have been in existence for approximately 120 years, evolving from basic sewage farms to sophisticated facilities that are essential for maintaining water quality and sustainability in modern urban and industrialized areas.
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