1.2.3這三題有點忘記怎麼算了😵😵😵 求解😥😥😥

物理作業2 學號: 姓名: V1. 世界上第一台超音速汽車Thrust SSC,在16sec內從靜止加速到1000km/hr,其加速度為 多少m/sec²7 v 2. 50kg的太空人在(1)地球表面及(2)火星表面(g=3.92m/sec?)的重量各是多少nt? (同學可想想太空人在火星表面肌肉退化和骨質疏鬆的可能性) V 3. 一隻2000kg的大象,地球承受多少向上的力量?

求解5、6、20、22、23 真的麻煩大家了，求求了🙏🙏🙏

tant. 5. 轟炸機以 140m/s 的水平速度,距海面 1000m 高處向靜止於海面的目標投彈,求其瞄準角的正切值為若干?g=9.8m/s* (0004: (A)0.5 (B)0.25 (C) 1 (D)1.5 (E) 2 比 ⑥F 質點在平面上運動其位置為产=(4t−3)y+t*](S. I),求1 秒末質點之法線加速度?(A)4.8 A 10.2 點课程的平均加速度量值為何? (332.4 2.4 (CY2 (D)3.6 140. ext=10

求解

169. A cannon fires a projectile as shown. The dashed line shows the trajectory in the absence of gravity; points MNOP correspond to the position of the projectiole at one second intervals. If g = 10 m/s², the lengths X,Y,Z are: A) 5 m, 10 m, 15 m B) 5 m, 20 m, 45 m C) 10 m, 40 m, 90 m D) 10 m, 20 m, 30 m E) 0.2 m, 0.8 m, 1.8 m M

A答案，求救

A laser beam of intensity S and cross-sectional area A is completely absorbed by a particle of mass m for a period At. What is the change in speed of the particle? (A) SAAt/mc; (B) SAAt/m; (C) SA/mc; (D) SAAt/c; (E) None.

剛開始在練題目，很多題不了解，大家幫幫忙～感恩

(2) 十九世紀末,普朗克對「熱輻射實驗」結果提出驚人的創見--能量量子化理論,認為 任何一束光都有一基本能量單元,稱為能量量子,其值為E=吋,該束光的總能量為然的 整數倍,即E= 列何者? kg² m (A) sec³ kg² m (B) sec SI 中的基本單位來表示,應為下 式子中「」稱為普朗克常數,若以 kgm² (C) sec kgm (D) sec² kg² m² (E) sec 2

運動學問題 謝謝，拜託了，詳解

若司機發現黃燈並決定讓公車以等速滑行通過路口,此時車頭 離路口界線只剩10公尺,若要在變紅燈前讓全車安全通過路 口,則黃燈至少要再持續多少秒? 【100 嘉中科學班初試】 公車 50公尺 某步槍兵在靶場中將步槍架於和靜止標靶中 心同一水平等高處,之後啟動標靶使其以1公 尺/秒的速度由左向右水平移動,移動路線和 步槍的描準線互相垂直且步槍至標靶移動路 線的垂直距離為 50 公尺,當此人由眼睛望向 準心,當眼睛、準心和靶心三者成一直線時扣 下板機,之後觀察標靶上的擊中點如圖,靶的直徑為 50 公分且各同心圓間距相等。此人 從看到目標到扣下板機擊發子彈的反應時間為0.12 秒,則子彈的速度為多少尺/秒。 (不考慮空氣阻力及重力加速度) 【100 嘉中科學班初試】 4. 有些書上說:「投手投出的球,如果不會自轉,則為直球。」真的是如此嗎?假設空氣 對棒球不施予任何力量,今有一投手將棒球以時速144km/hr 水平投出(投出後棒球將只受 有重力,而不受其他任何力),若投手到捕手的水平距離為 20m,且g=10m/s²,則球在由 投手飛至捕手的過程中,其垂直高度將下降」 25 m。 【100 中一中科學班】 Sec 5. 北二高某路段為南來北往的六線快車道,車速限制108km/hr。若假設安全車距為60m,此 段快車道每小時的車陣最大流量約為多少輛? 【100 彰中科學班】 (A)1.08×104 (B)9.24x10³ (C)2.00x10° 45 (D) 4.00×10¹ (E)條件不足,無法預估 1 20公尺 (FL 培) 58

有人會解這個嗎？想知道答案

5. (Ch. 14 - Problem 81 in Wolfson) Two loudspeakers are mounted 2.85 m apart, pointing in the same direction and producing identical sound waves of a fixed fre- quency. You're standing 10.0 m from the speakers, on the perpendicular bisector of the line between them. You move in direction parallel to the line between the speak- ers and find that the sound intensity diminishes, reaching a minimum when you've moved 2.44 m. If the sound speed is 343 m/s, what is the frequency of the sound waves?

1.5怎麼換

Japan baseball major league, Unit Conversion 1.5 Convert 2.7104 Btu/(Ib.sec) to cal/(kg.min) (round to 10-1)

21題 教教我QAQ

Section 11.3 Angular Momentum J-s behind rmv a he ur 265 = ? a ter 30. Example 11.1: A 58.1 Iw COMP string and whirled at 18. Express the units of angular momentum (a) using only the funda- momentum of magr mental units kilogram, meter, and second; (b) in a form involving the circular path. Fir newtons; (c) in a form involving joules. marw horizontal and (b) the 19. Use data from Appendix E to make an order-of-magnitude esti- 31. Example 11.2. A stai mate for the angular momentum of our Solar System about the Max 27 the end of its lifetime galactic center. mu = 17.293 of radius 4.96 X 10' 20. A gymnast of rotational inertia 63 kg•m? is tumbling head over heels dwarf of radius 4.21 with angular momentum 460 kg•m?/s. What's her angular speed? 17.99 acted on the core, fine A 660-g hoop 95 cm in diameter is rotating at 170 rpm about its 32. Example 11.2: Astro 22. A 1.3-th-diameter golf ball has mass 45 g and is spinning at central axis. What's its angular momentum? L: 1W=0-66*(0-95) x 140x277.10 km and determin core that collapsed to 3000 rpm. Treating the golf ball as a uniform solid sphere, what's ing with a period of 4 its angular momentum? 18-3 33. Example 11.2. The s 10-598 rpm With her arms outstre Section 11.4 Conservation of Angular Momentum tational inertia is 3.5 23. A potter's wheel with rotational inertia 6.20 kg•m? is spinning (Fig. 11.6b), her rot freely at 20.0 rpm. The potter drops a 2.50-kg lump of clay onto her final spin rate? L = 6 2 x 2-1 = 12-99~13 - 2x2 22 13= 60.48)" x 2.5 W W = 2 . X z W = 20x2T 60 ²2.1 ~ 1 12.574

第21題 到底要怎麼寫ಥ_ಥ

Section 11.3 Angular Momentum J-s behind rmv a he ur 265 = ? a ter 30. Example 11.1: A 58.1 Iw COMP string and whirled at 18. Express the units of angular momentum (a) using only the funda- momentum of magr mental units kilogram, meter, and second; (b) in a form involving the circular path. Fir newtons; (c) in a form involving joules. marw horizontal and (b) the 19. Use data from Appendix E to make an order-of-magnitude esti- 31. Example 11.2. A stai mate for the angular momentum of our Solar System about the Max 27 the end of its lifetime galactic center. mu = 17.293 of radius 4.96 X 10' 20. A gymnast of rotational inertia 63 kg•m? is tumbling head over heels dwarf of radius 4.21 with angular momentum 460 kg•m?/s. What's her angular speed? 17.99 acted on the core, fine A 660-g hoop 95 cm in diameter is rotating at 170 rpm about its 32. Example 11.2: Astro 22. A 1.3-th-diameter golf ball has mass 45 g and is spinning at central axis. What's its angular momentum? L: 1W=0-66*(0-95) x 140x277.10 km and determin core that collapsed to 3000 rpm. Treating the golf ball as a uniform solid sphere, what's ing with a period of 4 its angular momentum? 18-3 33. Example 11.2. The s 10-598 rpm With her arms outstre Section 11.4 Conservation of Angular Momentum tational inertia is 3.5 23. A potter's wheel with rotational inertia 6.20 kg•m? is spinning (Fig. 11.6b), her rot freely at 20.0 rpm. The potter drops a 2.50-kg lump of clay onto her final spin rate? L = 6 2 x 2-1 = 12-99~13 - 2x2 22 13= 60.48)" x 2.5 W W = 2 . X z W = 20x2T 60 ²2.1 ~ 1 12.574