想請問這題🙏，有點看不懂圖三的公式是從何而來，卡住了

EXAMPLE 21.11 FIELD OF A UNIFORMLY CHARGED DISK A nonconducting disk of radius R has a uniform positive surface charge density o. Find the electric field at a point along the axis of the disk a distance x from its center. Assume that x is positive. SOLUTION IDENTIFY and SET UP: Figure 21.25 shows the situation. We rep- resent the charge distribution as a collection of concentric rings of charge dQ. In Example 21.9 we obtained Eq. (21.8) for the field on the axis of a single uniformly charged ring, so all we need do here is integrate the contributions of our rings. EXECUTE: A typical ring has charge dQ, inner radius r, and outer radius r + dr. Its area is approximately equal to its width dr times its circumference 2πr, or dA = 2πr dr. The charge per unit area is σ = dQ/dA, so the charge of the ring is do = o da = 2πor dr. We use dQ in place of Q in Eq. (21.8), the expression for the field due to a ring that we found in Example 21.9, and replace the ring 21.25 Our sketch for this problem. Idr dQ X P dEx dEx radius a with r. Then the field component dEx at point P due to this ring is 1 2πσrx dr 4π€0 (x² + ²)3/2 SOLUTION Continued

請問第四題🙏🙏🥺

(3) () (A) even now (B) for no reason (C) ever since (D) from now on (A) (A) other (B) others (C) some (D) another (5)(A) makes it fun to (B) shows pride in (C) refers to (D) plays a pa (1)B (2) C (3) C (4) A (5) D

求解3的B

美處 某事 做某事 人做某事 …而且… 事 HOVER Why Men Are Men and Women Are Women 65 e already know that as children, boys wrestle and girls play make-believe. Boys often like building things and taking them apart. On the other hand, girls prefer to host and attend pretend tea parties. But why do these differences W exist? Advanced Several months after babies are born, female babies like to look at a person's face to read emotions while male infants prefer to look at objects. Few would disagree that men care more about objects while women tend to empathize with others. However, the sex of our brain is not always as clear-cut as the sex of our body. In one experiment, a tough man, who seemed very competitive, was shown to possess a high degree of empathy, while a woman scored the highest in a hand- 10 eye coordination test at which men were thought to do better. This shows that the distinctions that set us apart might not be as clear as we think. 5 I t ZAN Differences between the sexes are hard to understand and so are relationships. What on earth makes people fall in love? According to a report, men prefer a particular waist-to-hip ratio, which indicates reliable fertility, while women 15 care more about a man's height, which is thought to be related to success. These are some of the reasons for initial attraction. way (we we see way Some psychologists suggest that our feelings may change the our partners Newlyweds were given a brain scan. The "reward" parts of their brains were filled with feel-good chemicals while the critical judgment part was 20 suppressed. It seems that the old expression "love is blind" has some truth. truth. 193

微積分求解

8. [0/8 Points] Consider the following limit. DETAILS lim Ax-0+ lim Ax-0+ Submit Answer 8 X + Ax Ax Simplify the rational expression as much as possible. 8 x(x + Ax) X 8 X PREVIOUS ANSWERS X Evaluate the one-sided limit. (If an answer does not exist, enter DNE.) DNE LARCALC12M 1.4.029.EP.

1.30 plz用中文講解謝謝！

The message "Pass 0.12" is to be sent via communication line. For this, each character of the message should be encoded into a seven-bit ASCII code including the period and the it. Write the expression for the message sent. space. Each ASCII encoded character should be then encrypted by adding binary 101 to 1.29* Decode the following ASCII code: 10000110101110 1000010 1000001 1000010 1000010 1000010 1000111 1000101. 1.30 The following is a string of ASCII characters whose bit patterns have been converted into hexadecimal for compactness: 47 2E 5C 42 CF CF CC C5. Of the eight bits in each pair of digits, the leftmost is a parity bit. The remaining bits are the ASCII code. (a) Convert the string to bit form and decode the ASCII. (b) Determine the parity used: odd or even?

這題是我錯了嗎？還是解答給錯答案給2/x

1 設0<x<1,化簡 x+ X² +2+ √x² +- x² (x+1)+(x-x)=2X = 2X 2/N x.

求解

22 The Most Famous Meal D pieces of art in STRO F ive hundred years ago in Milan, Italy, one of the most famous a long table covered with food, shortly before he was crucified. Gathering around human history was completed. It shows Jesus and his followers sitting behind This scene, painted by Leonardo da Vinci is called The Last Supper.12b101 Jesus, his 12 followers react in shock to the news that one of them will betray him. 5 S- The Last Supper took da Vinci three years to complete. In painting this masterpiece, da Vinci presented the anger, fear, and doubt felt by the 12 followers of Jesus. To the left is Judas, drawing back into the shadows in surprise that his plan is known. In the center of the painting sits Jesus himself. The window behind 10 him shines like a halo. It gives light to the scene, just as Jesus gives peace to his followers. The expression on his face is calm as if he has already forgiven the one who will betray him. 就像 The outline of Jesus forms a triangle. There are also three windows, and his followers are sitting in four groups of three. The number represents the three sides of the Christian God: the Father, Son, and Holy Spirit. Da Vinci seemed to show that God's love for humans is stable and will last forever. Today, The Last Supper can still be viewed in Milan, though its colors have faded away after such a long time. However, the themes of finding love and hope in times of trouble are just as strong today as they ever were. 64 DBB

請問58（1） 為什麼不用考慮B的濃度級數呢？ 單純是因為無法看出來嗎？ 謝謝🥹

58. At el 10 g →CE) 2.96 0.0050 0.010 0.020 temperature, reactant A reacts according to the chemical equation: sk= A(g) +B(2) ► At 500 °C, the rate of the reaction increases with concentration of A as follows: =310 [A](M) Rate(M/s) = 152 1.2x10-2 (1) Determine the order of the reaction and write the rate expression. R=k [A] (2) Calculate the rate constant, and give its units k= = 1,24 104 (5!M² (3) Calculate the rate for a 0.0020 M concentration of A. R = 1,27104 台大) vust Rk) (1) R = K[A] ; (2) k = 12000M-s-+; (3) R =9.6x10-M/s -9.6x10.5 ($3$ (= s ON SX102 1.5x10-3 9.6x10-2 12x10 (0.01) R = 1,28104 (0.002 y 1014 +B) ( M) -2 -1 =

求第10題

a Many people love cute things, but not everyone knows how to behave around them. Have you ever spotted a kitten that was 8 cute 8_ it made you angry? Perhaps you had a pressing need to make scary faces at the tiny creature or play roughly with If so, don't worry, because there's a rational explanation for why this occurs. A sudden 9 to act violently around cute things is an example of “cute aggression.” It's part of a phenomenon known as “dimorphous expression,” which occurs when our inner feelings and outer emotions don't match. Some other examples of this behavior are yelling when we receive a piece of good news or crying when we are very happy. Experts believe dimorphous expressions happen in intense situations because they show motivation 10 emotion. For example, growling at a cute puppy likely indicates that a person wants to play with the animal. It's important to point out that only 50% of people behave this way when they encounter something 11_. Perhaps it's because the people who don't show cute aggression aren't feeling intense emotions about the object. Or, they may have more subtle ways of expressing themselves. Cute aggression is not a bad thing at all, 12 In fact, it's probably a helpful tool that teaches baby animals the real difference 24 English Digest. Teacher's Guide · January 2022 有著作權,任何使用需經本社同意 between danger and play. (Unit 9) B 8. (A) as; as A9. (A) urge (B) so; that (B) layout (B) in case of (C) not; but (C) upgrade (C) as for (D) such; that (D) signature (D) as well as D 10. (A) without

這題答案E錯在哪

6. Mendel used the scientific approach to indentify two laws of inheritance, which comment about “Mendelian genetics” is NOT correct? (1021 > < A. Mendelian genetics includes two laws as law of segregation and law of independent assortment. B. The law of segregation states that genes have alternative forms, or alleles. C. The law of independnet assortment states the pair of alleles for a given gene segregates into gametes independently of the pair of alleles for any 6. In other gene. D. Traits are inherited in discrete units, and are not the results of blending. E. In heterozygotes, the two alleles are different, and the expression of two different alleles makes phenotypic effects of the other.