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

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When a helium atom absorbs light at 51.31 nm, an electron is promoted from the 1s orbital to a 6d orbital. Given that the ionization energy of (ground state) helium is 2372 kJ/mol, find the longest wavelength (in nm) of light that could eject an electron from the excited state helium atom. nm Submit Answer Try Another Version 2 item attempts remaining

請問根據(f)小題我求出的s，怎麼進行一階和二階微分？

(e) (6%) Find the inverse demand function p =D (q), and write down both the domain and range for D (q). 1 (f) (10%) Given the inverse demand function obtained above, and note that the sales revenue of the firm is given by s = p(q) x q. Find both the first- and second-derivatives of s with respect to p, i.e., s' (q) and s" (q).

第59、61🙇

49-60 Find the absolute maximum and absolute minimum values of f on the given interval. 49. f(x) = 12 + 4x - x², [0, 5] 50. f(x) = 5 + 54x2x³, [0, 4] (51.) f(x) = 2x³ 3x² - 12x + 1, [-2,3] 52. f(x) = x³ - 6x² + 5, [-3,5] 53. f(x) = 3x4 - 4x³ - 12x² + 1, [-2,3] 54. f(t) = (t²-4)³, [2, 3] 1 55. f(x) = x + = ₁ X 56. f(x) X 2 x² = x + 1’ - 57. f(t) = t - √√t, [-1,4] √t 1 + t22 59. f(t) = 2 cost + sin 2t, [0, π/2] on ball = [0.2, 4] 58. f(t) = = [0, 3] [0, 2]

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76. At time t= 0 a car has a velocity of 16 m/s. It slows down with an acceleration given by -0.50t, in m/s² for t in seconds. At the end of 4.0 s it has traveled: 0 12 m 9=-052 = √²-025² C) 14 m D) 25 m E) 59 m E A) B) 77. The graph represents the straight line motion of a car. How far does the car travel between t = 2 seconds and t = 5 seconds? D v (m/s)

這題~謝謝 請問x=1時極限是不存在還是無限大還是...？

4. 1 y YA r BAUDIA X

48謝謝！

| 2x -0² (b) f(x) = x = 2 (c) f(x) = [sin x], a = π a = 2 44. If f(x) = x² + 10 sin x, show that there is a number c such that f(c) = 1000. 45-48 Use the Intermediate Value Theorem to show that there is a solution of the given equation in the specified interval. 45. -x² + 4x +1=0,(-1,0) 46. 2/x = x - √√x, (2,3) 47. cos x = x, (0, 1) 48. sin x = x² - x, (1, 2) | 49-50 (a) Prove that the equation has at least one real solution. (b) Use a calculator to find an interval of length 0.01 that

第3 謝謝！！

3. Use the given graph of f(x) = √√x to find a number 8 such that if |x − 4| < 8 then |√x - 21 <0.4 2.4 2 1.6° |x-1|<8 0 12 YA 4 y = √√x 4. Use the given graph of f(x) = x² to find a number 8 such that if 7 X

求解 136、137

D) E) none of these =11 136. Two vectors have magnitudes of 10 and 15. The angle between them when they are drawn with their tails at the same point is 65°. The component of the longer vector along the line of the shorter is: A) 0 B) 4.2 C) 6.3 D) 9.1 E) 14 137. Let S = (1 m)2 + (2 m)j + (2 m) and T = (3 m)2 + (4 m)k. The angle between these two vectors is given by: A) cos ¹(14/15) B) cos ¹(11/225) cos ¹(104/225) cos ¹(11/15) cannot be found since S and 7 do not lie in the same plane 138. Two vectors lie with their tails at the same point. When the angle between them is increased by 20° their scalar product has the same magnitude but changes from positive to negative. The original angle between them was: A) 0

各位大神 求解 拜託🙏🆘

CA 梁柱 一截面積是原來的兩倍 22. Two girders are made of the same material. Girder A is twice as long as girder B and Bo DE C B³ has a cross-sectional area that is twice as great. The ratio of the mass density of girder A to the mass density of girder B is: 質量密度 A) 4 B) 2 C) 1 D) 1/2 E) 1/4 29. During a short interval of time the speed v in m/s of an automobile is given by v=at² + bt³, where the time t is in seconds. The units of a and b are respectively: A) m-s²; m-s4 s³/m; s4/m dv=at+bt² B) C) m/s²; m/s³ D) m/s³; m/s4 E) m/s4; m/s5 34. The position y of a particle moving along the y axis depends on the time t according to the equation B) C) D) E) 質固定,体2倍 #%# 40. The coordinate of an object is given as a function of time by x = 7t-31², where x is in meters and t is in seconds. Its average velocity over the interval from t = 0 to t = 2 s is: A) 5 m/s X₂=0, X₁₂=14-12=2 B) -5 m/s 11 m/s C) D) -11 m/s (2-0)/2=1 E) -14.5 m/s 41. The coordinate of a particle in meters is given by x(t) = 16t-3.01³, where the time t is in seconds. The particle is momentarily at rest at t = A) 0.75 s A y = at -bt². The dimensions of the quantities a and b are respectively: A) L²/T, L³/T2 B) L/T², L²/T C) L/T, L/T² D) L³/T, T²/L E) none of these 1.3 s 5.3 s 7.3 s 9.3 s V(t) = 16-9+² =- [9t²-16) =-(3t+4) 13t-4) =+= 0.75 45. The velocity of an object is given as a function of time by v = 4t-312, where v is in m/s and t is in seconds. Its average velocity over the interval from t=0 to t=2 s: A) is 0 B) is -2 m/s C) is 2 m/s D) is -4 m/s E) cannot be calculated unless the initial position is given 49. A particle moves along the x axis according to the equation x = 61² where x is in meters and t is in seconds. Therefore: E B) C) D) E) A) the acceleration of the particle is 6 m/s² t cannot be negative the particle follows a parabolic path each second the velocity of the particle changes by 9.8 m/s none of the above