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.
Find more on power:
#SPJ6
Answer:
1200 Watts is the answer
X - rays are considered an oxidizing mutagenic agent. X-rays are high energy electrons that can cause damage when exposed under extreme conditions. The best technology that can block it is t using a lightweight type of metal foam. It can take in high energy collisions which also exhibits high forces. it does not only block x-rays but also, neutron radiation and gamma rays.
Answer:
o m
Explanation:
The net displacement is 0 because it returns to its original position. The final position and initial position are the same, so displacement is 0.
Reactivate
B) a glow stick
C) photosynthesis
D) a hydroelectric dam
The question involves the concepts of chemical energy, light energy and energy conversion.
The example which involves the transformation of chemical energy directly into light energy is "B) a glow stick".
A)
In a windmill, the input energy is the wind energy, and that wind energy is then converted to mechanical energy when the rotor blades rotatae. That mechanical energy is then converted to electrical energy. This electrical energy is then used in lamps to get light energy. Hence, the chemcial energy is not directly transformed into light energy in the windmill.
B)
A glow stick uses the chemical energy from the chemicals inside it to produce luminance in the form of light energy. When the stick is bent or broken, it releases the chemicals inside it which undergo a chemical reaction that leads to the conversion of chemical energy into light energy.
C)
During photosynthesis, light energy is used by plants to produce oxygen and energy in the form of sugar (glucose).
D)
A hydroelectric dam receives mechanical energy from water. The gravitational potential energy of water due to its height is converted into kinetic energy when it reaches the turbine. This kinetic energy is then converted to electrical energy.
Hence, the only example where chemical energy is directly converted to light energy is Glow Stick.
Learn more about energy conversion here:
brainly.com/question/11234965?referrer=searchResults
The attached picture shows different energy conversions.