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Anonymous users2024-02-07Question 1: Answer: The pressure is 9x10 5 Pa Because the pressure does not change with the expansion of the area, when the 9.6 million square kilometers of China's territory is vertically irradiated by sunlight, the pressure of the light received is 9x10 5 Pa.
Question 2: (1) According to the principle of force balance, the force on the wall and the force on the horizontal plane are balanced, so the pressure on the wall is 20n
2) The pressure on the wall p=fs=20n mm²)=40nmm*mm=4x10-5 Pa.
3) The pressure on the pushpin cap p2 = f2 s2 = 20n square centimeters) = 25n cm * cm = Pa.
The first question must be written in words, the last two questions can be written without words, directly on the formula, and the last two questions, when the calculation process is numbered, you can not add units, and finally write the result directly. . .
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Anonymous users2024-02-061) The pressure of the light subjected is 9x10 5 Pa.
The pressure of the light experienced f = ps = 4 6 10 (-5 power) pa 960 10 (10 power) m square = power) n
The pressure on the walls is 20 N.
2) The pressure on the wall p=f s=20n [m²=?Handkerchief.
3) The pressure on the pushpin cap p=f s=20n [square meters = ?Handkerchief.
Calculate by yourself, and be sure to pay attention to the units of f and s when calculating.
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Anonymous users2024-02-051.Bridge crossing = team length + bridge length.
Team Speed: (350+100) 300 = Meter Seconds Required: (1100+100) seconds.
2.Crossing the tunnel is the same as crossing the bridge, the distance = the length of the car + the length of the tunnel 72 kilometers = 72000 3600 = 20 meters The length of the tunnel in seconds: 20 120-150 = 2250 meters 3The distance completely in the tunnel = the length of the tunnel - the length of the vehicle.
The time sought: (seconds.)
4.Distance = speed time.
The distance ratio is (1 3) :( 3 4) = 1:4
m2) 34 2 = 17 m.
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Anonymous users2024-02-041. Because of floating, buoyancy is equal to gravity = mg = 25n
2. Calculate the buoyancy first, f=pvg=1000kg m3*(
Because it floats, so gravity = buoyancy = 900n, and because the swimming ring weighs 25n, then Xiao Ming is (900-25) 10=
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