Solar energy is one of the key energy sources to be developed and utilized in the 21st century Junio

Solution: (1) The power of the motor when working P1=UI=120 10W=1200W can receive the power of the sun P2=P0S=1000 8W=8000W, so the efficiency of the solar cell to convert solar energy into electrical energy is =P1P2=

1200w8000w=15%．

Answer: The efficiency of solar cells to convert solar energy into electrical energy is 15% 2) P1 1=fv,v=

p1η1f=

Answer: The speed of the car when driving at a constant speed is 6m s

3）f=f=

G car + G cargo 10 g cargo = 10F - G car = 10 150-90 10n = 600n = 60kg

Answer: the car can load 60kg of goods when driving at a constant speed along the horizontal road surface 4) can not be mass-produced on the market 1, slow speed 2, small cargo capacity

Solution: (1) The power of the solar energy received by the panel of the solar cell is.

P too = p0s = 1 103 8w = 8000w converted into the electrical power of a solar car is.

P = UI = 120V 10A = 1200W

The efficiency of a solar cell in converting solar energy into electrical energy is.

a= p electricity p too 100%=1200w 8000w=15%1) Let the conversion efficiency of the car be 2, then the mechanical power of the car is.

P machine = P electricity 2 = 1200w 75% = 900w When the car is driving at a constant speed, there is.

P machine = w t = fs t = fv, so f = p machine v = 900 6 = 150 (n).

Summary. Now the use of solar energy has extended to all areas of people's lives: from solar airplanes that do not use fuel to solar cells on artificial satellites and spacecraft; From solar bicycles, solar cars, and solar yachts to comfortable and clean "sun houses", "sun villages", and "sun cities"; From a variety of lightweight solar water heaters, condenser stoves to non-polluting solar power plants, solar seawater stills, ......People are building a world full of solar energy.

With the continuous development of science and technology, what fields has the use of solar energy expanded to today?

Now the use of solar energy has extended to all areas of people's lives: from solar airplanes that do not use fuel to solar cells on artificial satellites and spacecraft; From yard width and too buried mold chaotic solar energy bicycles, solar cars, solar bending energy yachts to comfortable and clean "sun room", "sun village", "sunshine city"; From a variety of lightweight solar water heaters, condenser stoves to non-polluting solar power plants, solar seawater stills, ......People are building a world full of solar energy. Thank you.

Solution: (1) The power of the motor when it is working P1 = UI = 120V 10A = 1200W can receive the power of the sun P2 = P0S = 1000 8W = 8000W, so the efficiency of the solar cell to convert solar energy into electrical energy is =

P1 P2 1200W 8000W 15% Answer: The efficiency of a solar cell to convert solar energy into electrical energy is 15% (2)P1 1=fv,

v＝p1η1/f

1200 150 m s 6m s A: The speed of the car when driving at a constant speed is 6m s (3) F F (G car + G car) 10

G cargo 10F G car 10 150 90 10N 600N 60kg Answer: The car can load 60kg of goods when driving at a constant speed along the horizontal road surface (4) can not be mass-produced on the market 1, slow speed 2, small cargo capacity

Typing is not easy to give the best pro.

Solution: (1) The power of the solar energy received by the panel of the solar cell is p too = p0s = 1 103 8w = 8000w converted into the electrical power of the solar car is.

P = UI = 120V 10A = 1200W

The efficiency of a solar cell in converting solar energy into electrical energy is.

a= p electric p too 100% = 1200w 8000w = 15%.

(1) 15% (2) 6m s (3) 60kg (4) cannot be mass-produced. The first reason is that the speed is too slow, and the second reason is that the load capacity is too small.

The industry has entered winter.

Solution: (1) The power received by the panel of the solar cell is p too.

p0s=1×103

w/m2×8 m2

8000W, which translates into the electrical power of the solar car is p electricity.

UI=120V 10A=1200W, the efficiency of the solar cell to convert solar energy into electrical energy is.

Solution: (1) The solar power received by the panel of the solar cell:

P too = p0s = 1 103w 8 = 8000w, which translates into the electrical power of a solar car:

P electricity = UI = 120V 10A = 1200W, the efficiency of the solar cell to convert solar energy into electrical energy:

p Electric. p too.

1200w8000w

2) The mechanical power of the car:

P machine = P electricity = 1200W 75% = 900W The speed of the car traveling at a constant speed: V = P

F900W because the car is driving at a constant speed, the force is the balance force, so the resultant force is 0, so the answer is: (1) 15%; （2）；0．

The biggest problem with solar cars is how to store energy and how to use it without solar energy.

The difficulty with solar cars is that the car cannot provide the required solar cell area and electrical energy storage.