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There is an inductive coil, l = 0.626h, connected to 220 V, 50 Hz sinusoidal alternating current to calculate the coil current and reactive power
Known: l = 0.626 h, u = 220 V, f = 50 Hz
I =? Q =?
Xc=2πfL=2X3.14X50X0.626=196.564 （）
I = u / XC = 220 / 196.564 = 1.12 (ampere)
Q = IU = 1.12x220 ≈ 246.4 (lack)
When a 1H inductor is connected to a sinusoidal power supply with frequency of 50 Hz and voltage RMS of 220 V, what is the RMS of current in the circuit?
(8 + 9 / 4) △ 4 simple calculation
8 / 4 + 9 / 4 divided by 4 equals 2 + 9 and 11
Known: n is an integer, can (2n + 1) 2-1 be divided by 8? Try to prove your conclusion
(2n + 1) 2-1 = (2n + 1 + 1) (2n + 1-1) = 4N (n + 1). ∵ n is an integer, ∵ N and (n + 1) are two continuous integers, n (n + 1) can be divisible by 2. ∵ 4N (n + 1) can be divisible by 8, that is, (2n + 1) 2-1 can be divisible by 8
How to solve the equation of 1.8-8x / 1.2-1.3-3x / 2 = 5x-0.4/0.3?
1.8-8x/1.2-1.3-3x/2=5x-0.4/0.3
1.8-8x-0.6(1.3-3x)=4(5x-0.4)
1.8-8x-0.78+1.8x=20x-1.6
26.2x=2.62
x=0.1
5. Wang Liang likes to collect toy cars. There are 18 toy trucks in his collection, accounting for 2 / 5 of the total. How many toy cars does he collect in all?
Please list the formula, complete solution,
6. A headdress is made of 4512.16 square centimeter cardboard. If the diameter of the headdress is 16 centimeter, what is the height of the headdress?
Please list the formula, complete solution,
7. The price of a digital camera is 8800 yuan, 200 yuan less than three times that of a digital camera. How much is the price of a digital camera?
Please list the formula, complete solution,
5.
18/（2/5）=45
A: he has a collection of 45 toy cars
six
4512.16/(3.14*16)=89.81
A: the height of the headdress is 89.81 cm
seven
（8800+200）/3=3000
A: the price of a digital camera is 3000 yuan
If we know that the limit of infinite equal ratio sequence {an} exists and satisfies A1 = a > 0, an + 1 = 2An + 3 / an, then Liman =?
If the limit exists, then Liman = LIM (an + 1), let Liman = x, then: x = 2x + 3 / x, then x can be obtained
888.. 88 (2002 8) divided by 26, what is the remainder? (urgent)
888.. 88 (2002 8) divided by 26, what is the remainder?
34188*26=888888,
A total of 2002 8, remove the previous 2002 / 6 = 333, more than 4 8,
So it's equivalent to 8888 / 26, the remaining 22
Simple operation 1.3.64/4 + 4.36 * 25% 2.3.6-2.8 + 7.4-7.2 3.6.42 * 1.01-6.42
1、3.64÷4+4.36×25% 2、3.6-2.8+7.4-7.2 3、6.42×1.01-6.42
=3.64×1/4+4.36×1/4 =（3.6+7.4）-（2.8+7.2) =6.42×1.01-6.42×1
=（3.64+4.36）×1/4 =11-10 =6.42×（1.01-1）
=8×1/4 =1 =6.42×0.01
=2 =0.0642
The general solution of differential equation 2yy '' = (y ') ^ 2 is () A. (x-C) ^ 2; b.c1 (x-1) ^ 2 + C2 (x-1) ^ 2; c.c1 + (x-c2) ^ 2; d.c1 (x-c2) ^ 2
A has only one arbitrary constant. If you remove it, B can also be merged into an arbitrary constant. If you remove it, C is not the solution
D is the solution and has two arbitrary constants
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