In the fifth grade of primary school, we are eager to find the words in the Chinese Vocabulary Manual lesson 14 and Lesson 15

In the fifth grade of primary school, we are eager to find the words in the Chinese Vocabulary Manual lesson 14 and Lesson 15

14: There are endless, scattered, ingenious, overjoyed, ordered, flashed, plain, open, and endless benefits

Fifth grade Chinese Volume II Vocabulary Manual unit 6 accumulation over time

Gentle: describes a person as elegant and polite
Appearance: describes a person's appearance
The back is as broad as a tiger, and the waist is as strong as a bear
Strong body: strong body
Exuberant: full of spirit, radiant
Full face: it refers to a person's happy and comfortable expression. It describes a kind and happy face
Dejected: to describe the appearance of disappointment
Gape: to describe the appearance of being stunned by surprise or fear
Walking like flying: describes walking as fast as flying
Vivacity: a lively, joyful and energetic appearance
Swagger: swagger as you walk. It describes the arrogance that you think is great
Bowing: a metaphor for false respect or excessive politeness
Whisper: a word used to describe speaking in a low voice
Glib tongue: the tongue is dexterous, like a reed, which can produce beautiful music. It is used to describe glib and eloquence
Eloquence: describes being good at speaking and making people like listening
Deep and powerful words and deep feelings
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If a + B + 1 = 0, find the minimum of (A-2) &# 178; + (B-3) &# 178

(a, b) are the points on the line x + y + 1 = 0
The minimum distance from point a (2,3) to the point on the line is the distance from a to the line D
d=|2+3+1|/√(1²+1²)=3√2
So the minimum value of (A-2) &# 178; + (B-3) &# 178; = D & # 178; = 18

How many kilowatts of electricity does a 50 Watt appliance need to last for 24 hours?

1.2 degrees

Put 3 balls into 4 cups randomly, and find the probability of 3 balls in the same cup?

1 / 16 if the first ball is put into any cup, the probability of the second ball in the cup is 1 / 4, and the probability of the third ball in the cup is 1 / 4, so the probability of three balls in the same cup is 1 / 16

A physics problem: "two light bulbs of 220V 100W" are connected in series in the circuit of 220V. What is the actual power of each light bulb?

The actual power is 25W
Because the two lamps are exactly the same, they share the same voltage and each lamp is divided into 110V, that is, each lamp works under 110V,
First, calculate the actual power of a bulb at 110V
It is known that P0 = 100W, U0 = 220V,
So r = U0 ＾ 2 / P0 = 220 * 220 / 100 = 484 ohm
Actual power at u = 110V P = u ＾ 2 / r = 110 * 110 / 484 = 25W
The actual power of each bulb is 25W

2.14 * 15.4 0.46 * 21.4 how to calculate?

2.14*15.4+0.46*21.4
=2.14×15.4+4.6×2.14
=2.14×（15.4+4.6）
=2.14×20
=42.8

How many years did volt invent the battery?

In 1799, volt immersed a piece of zinc plate and a piece of silver plate in salt water, and found that there was an electric current passing through the wire connecting two pieces of metal. Therefore, he put many pieces of flannelette or paper soaked in salt water between the zinc plate and the silver plate and folded them flat. When he touched the two ends with his hand, he would feel a strong electric current stimulation

1+2+3+.+100+99+98+...+1=?

10000

Use a solar water heater to heat 40 kg of water. The water temperature rises from 18 ℃ to 36 ℃. How many joules does the water absorb? If the heating efficiency is 20% with coal feed water with combustion value of 3.0 × 107 J / kg, how many kg of coal should be burned? (specific heat capacity of water C water = 4.2 × 103J / (kg ·℃))

(1) Heat absorbed by water: Q absorption = cm △ t = 4.2 × 103J / (kg ·℃) × 40kg × (36 ℃ - 18 ℃) = 3.024 × 106j; (2) according to the question: Q absorption = m ′ Q × 20%, mass of coal to be burned: m ′ = q absorption Q × 20% = 3.024 × 106j3.0 × 107j / kg × 20% = 0.504kg