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When listening, there is a question about what birds are doing. The answer is nodding,
Nodding or drooping; drowsy
v. Nod; doze; swing (in the form of NOD)
Nodding
What does point to the window mean
Point to the window
How to calculate 19.8 × 1.1 simply
I'm in a hurry
19.8 ×1.1
=(20-0.2)×1.1
=20×1.1-0.2×1.1
=22-0.22
=21.78
How far can a 72V electric car run
I'm Dongzhi electric motorcycle. 600W motor 30an controller is Jianqiao's battery. The boss is Xinri. I can't run 80km in 12 hours when I'm fully charged for the first time. The boss said that I can't run 80km when I'm fully charged. She said that I can run 120km when I need to charge for 7 times. That's no more than 80. I only ran more than 70km when I charge for the first time, but I can't reach 80. I think the boss delayed my replacement and warranty time, She is sophistry. I want to return it. Is it difficult for the new battery to be fully charged after 7 times? The first time doesn't count. The boss is delaying my 3-Pack time
There are many factors that determine how far an electric car can run: the motor, battery and other factors are fixed, and the motor with high efficiency and large battery capacity can run farther
Calculation: 0.5 - (- 3 and 1 / 4) + (1 + 2.75) - (+ 5 and 1 / 2)
0.5 - (- 3 and 1 / 4) + (1 + 2.75) - (+ 5 and 1 / 2) = 0.5 + 3.25 + 3.75-5.5 = 7.5-5.5 = 2
What are the letters for percentage content?
87 (38.7 × 0.4)
3.87 ÷ (38.7 ×0.4)
=3.87 ÷ 38.7 ÷0.4…… Dividing by the product of two numbers is equal to dividing the two numbers separately
=0.1÷0.4
=0.25
In the circuit shown in the figure, the range of ammeter is 0 ~ 0.6A, and that of voltmeter is 0 ~ 3V. The sliding rheostat is marked with "50 Ω 1A". When the switch S is closed and the slide of sliding rheostat slides to a certain position, the indication of ammeter is 0.3A, and that of voltmeter is 3V; when the slide of sliding rheostat slides to another position, the indication of ammeter is 0.5A, and that of voltmeter is 3V The indication is 1V. Calculate: (1) the resistance value and power supply voltage of resistor R1; (2) to ensure the safety of the circuit, adjust the range of sliding rheostat R2
(1) Switch S is closed, when the current number I1 = 0.3A, voltage number U1 = 3V, power supply voltage U = i1r1 + U1 = 0.3A × R1 + 3V ① When I2 = 0.5A, U2 = 1V, u = i2r1 + U2 = 0.5A × R1 + 1V ② The solution of the two equations is u = 6V, R1 = 10 Ω
How to calculate real numbers in Mathematics
Knowledge points of real number operation: operation types of rational number, various operation rules, operation law, operation order, scientific counting method, approximate number and significant number, calculator function key and application. Outline requirements: 1. Understand the significance of addition, subtraction, multiplication and division of rational number, understand the concepts of power and power, master rational number
How to type this symbol
Input method: intelligent ABC
Press the "V" key, then press the "1" key to find the inside
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