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The power of a machine is one kilowatt
One hour power consumption
1000 joules of work per second
How many joules of electricity is consumed
900 hours power 300W
900 x 300 x 3.6 x 10 ^ 6 = 9.72 x 10 ^ 11 joules
1 kwh = 3.6x10 to the 6th Joule
Confirmed,
-1W or - 2W?
-2W. The sign in front refers to whether it does positive work or negative work
What is the physical meaning of it?
The research shows that when sunlight irradiates the surface of an object, it will produce pressure, which is about 9 × 10 - 6 Pascal
Are you working on the topic of solar sail?
In fact, this concept is very easy to understand. First of all, sunlight is formed by photons (you can understand that air is made up of many gas molecules). Then photons will have pressure on objects, so there is pressure
In this way, we can solve your problem well
The physical meaning of "when sunlight shines on the surface of an object, it will produce pressure, which is about 9 × 10-6 Pascal"
The pressure on the object is 9 × 10 - 6 power when the sunlight irradiates an area of one square meter
Is my answer right?
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