🆘🆘🆘

7. 質量為m的小鋼球,在一頂角為74°固定於地旧时光肩痛 斗內,距地面高度為h的水平面上作等速圓周運動,如圖 所示。試問:此時小鋼球的速率為若干?( 重力加速度量 374 值為g) gh (A), 2 gh ( h 749 (A)/ D 2gh 3 (B) at (C)、2sh (D) (6) Fish /((m/

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

請問為什麼這題是A呢？？？

馬上練習3 如圖所示,有兩個固定不動的磁棒及螺線管,當螺線管通以電流時,空間中的磁力線分布 如圖中的虛線。下列何者為磁極A、B、C、D的磁性? 磁棒 B 螺線管 磁棒 D (A) N、S、N、N BIN、N、N、N CAS、S、N、N DIS、N、S、SBS、S、S、S。 RA

想問問各位🙋🏻‍♀️ 向心力量值和向心加速度量值要如何看呢？ 如果可以幫我畫個圖好嗎？ 感謝感謝🙇🏻‍♀️

0 (1)圓周運動的半徑R= his (2)擺錘的向心力量值為 向心加速度量值為 O

什麼是相對速度？

> 0 (C). 在外太空存在許多太空垃圾(space debris spacejunk),如:火箭燃燒殘渣,火 D 箭碎片,太空人遺失的工具,裝備等,繞地球軌道運行,它們有可能撞擊人造衛星 或天文望遠鏡的風險,甚至穿越大氣層,對地球上活動的生物產生威脅。若在距離 zo 地表約450 km處,太空人華特執行任務遺失的手套和柯林斯遺失的牙刷,分別以 - 6km/s的速度產生正面碰撞,則手套相對於牙刷的相對速度大小為多少km/s? (A) 0 (B) 1 (C) 6 来 (D) 12 (E) 36

教我🙏

ma 1.8 is in ms”手的張力為192 N ZON loka 30° TA g=10 m/s°,則物體的加速度量值為2.mis,B物體的加」 N。 lxa. 5a = lo cs a=2 | 20如圖所示,質量分別為2 kg 及8kg 的A、B兩木塊,以質 量可不計之輕繩連接,如圖所示。設斜面和地面皆光滑,若 重力加速度g=10 m/s,且二物體的初速均為零。下列敘述 T-10= th2o- T = 40 7A 1 事 IT o 4 M wa B. 30° FM 哪些正確? (3)因為A的質量小於B的質量,故系統維持靜止不動(B) A 的加速度量值為1 mis ein CB的加速度量值為2m/s (D) 輕繩的張力量值為8N E)輕繩的張力量值為20N。 OR IB 院

答案B求解

B C )如圖所示,A、B、C三木塊以細繩串接,在光滑水平地面受一水平拉力F而向右 作等加速運動,繩上張力分別為T、T。若B木塊質量突然增加,則有關繩張力 變化何者正確?(細繩質量可忽略不計) ang- h 5 gota + g = geta 3g = a - a=5g (A)T.變大、T變小(B) 變小、T變大(C)T」變大、Ti不變(D)Ti 不變、T 變小、(E)T變小、T變小 Ter F

求解

F-400N 60° 110 20053-160p (C)甲、乙、丙三人沿一運河拖拉一船,其中甲、乙的拉力分別 船的 為F與FiFi 與F,之大小與方向如圖所示。欲保持船在運 河中央,則所施的拉力及方向為何? (A)(2003-160)N,沿T作用 (B) (40003-320)N,沿Fi作用 (C)(20003 - 160)N,與運河垂直,向下方 (D)(20003-160) N,與運河垂直,向上方 (E)(40003-320N,沿F2作用 AC 300 F=320N 7 9 420 x= 2:53 x=32055

請問正向力怎麼算

Ning N 0 > COSE 九月十回 將質量為m的木塊置於質量為M的斜面上,如圖所示。設所有摩 擦力均可忽略不計,則欲使質量m 靜止於M時,則:(重力加速 度為g) (1)斜面的加速度為 Atting_, in 所受的正向力為 F. IMIT) 9