موضوع مناقشة واجباتPhys101 للترم 122

Computist · February 8, 2013, 11:41am

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Computist · February 8, 2013, 12:02pm

1. Ch3_Lec2_Q1

(Points: 1) Vector A has magnitude L/2 and vector B has magnitude L/2. When drawn with their tails at the same point, the angle between them is 60o. The magnitude of the vector cross product AxB is: A. L
B. L2/4
C. 0.87L2/4
D. L2/8
E. none of these

a. A

b. B

**c.    C**

d. D

e. E

    Save Answer https://webcourses.kfupm.edu.sa/webct/images/shim.gif         **2.  Ch3\_Lec2\_Q2**

(Points: 1) What is the angle (in degrees) between the two vectors A = (2i + 1j) and B = (-3i +1j +1k)? (Give your answer in three significant figures form)

**Answer 132 **

    Save Answer https://webcourses.kfupm.edu.sa/webct/images/shim.gif         **3.  Ch3\_Lec2\_Q3**

(Points: 1) 1Three vectors are given as: A= (1i + 3k), B = (-i - j + 2k) and C = (j +k). The value of A.(BxC) is: (Give your answer in three significant figures form)

Answer -6.00

Save Answer https://webcourses.kfupm.edu.sa/webct/images/shim.gif

Tell me if I was wrong

woifs_king · February 8, 2013, 3:17pm

شباب تكفون الهوم وورك الخامس

ambitious_91 · February 8, 2013, 4:02pm

بعد العشا ان شاء الله نبدأ فيه سوا

iiCrEaTiVe · February 8, 2013, 6:05pm

computist:

1. Ch3_Lec2_Q1

(Points: 1) Vector A has magnitude L/2 and vector B has magnitude L/2. When drawn with their tails at the same point, the angle between them is 60o. The magnitude of the vector cross product AxB is: A. L
B. L2/4
C. 0.87L2/4
D. L2/8
E. none of these

a. A

b. B
**c.    C**
d. D

e. E
    Save Answer https://webcourses.kfupm.edu.sa/webct/images/shim.gif         **2.  Ch3\_Lec2\_Q2**  
(Points: 1) What is the angle (in degrees) between the two vectors A = (2i + 1j) and B = (-3i +1j +1k)? (Give your answer in three significant figures form)

**Answer 132 **
    Save Answer https://webcourses.kfupm.edu.sa/webct/images/shim.gif         **3.  Ch3\_Lec2\_Q3**  
(Points: 1) 1Three vectors are given as: A= (1i + 3k), B = (-i - j + 2k) and C = (j +k). The value of A.(BxC) is: (Give your answer in three significant figures form)

Answer -6.00

Save Answer https://webcourses.kfupm.edu.sa/webct/images/shim.gif

Tell me if I was wrong

ممكن توضح السؤال الأول …

انا طلعلي D الجواب

استخدمت القانون

AB=ab cos وعوضت تعويض مباشر

ambitious_91 · February 8, 2013, 6:38pm

شباب بللليييز تكفوووون
اللي بيحط حل يحط الطريقة حتى البقية يعرفوا طريقة الحل شوي, ويعرفوا ويفهموا السؤال و هكذا!!؟؟

Azooz_Jk · February 9, 2013, 11:36am

سلام
شبآب في درسين في شابتر 2 الي هما 8 و 10 فيها انقريشن مافهمتهأ ؟؟؟
ايش اسوي ؟

Miizz · February 9, 2013, 4:14pm

يا شباب نزلوا الهومورك لناس الي حلوه

Xenos · February 9, 2013, 4:16pm

هو اساسا المفروض ما تعوض بcos لان السؤال يتكلم عن cross product و هذا النوع نستخدم معه Sin بدال الCos. و في النهايه يطلع عندك الجواب C

Xenos · February 9, 2013, 5:18pm

http://im34.gulfup.com/fHb5f.jpg

http://im34.gulfup.com/W4afH.jpg

aysksa · February 9, 2013, 5:24pm

Vector A has magnitude L/2 and vector B has magnitude L/2. When drawn with their tails at the same point, the angle between them is 60o. The magnitude of the vector cross product AxB is:
A. L
B. L2/4
C. 0.87L2/4
D. L2/8
E. none of these

a. A
b. B
c. C
d. D
e. E
L/2 x L/2 SIN 60 = 0.87L2/4

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Ch3_Lec2_Q2 (Points: 1)
What is the angle (in degrees) between the two vectors A = (2i + 2j) and B = (-3i +3j +2k)? (Give your answer in three significant figures form)
Answer
90.0

بالتعويض في المعادلة التالية طبعا المطلوب الزواية يعني يكون المجهول cos

http://hazemsakeek.com/Physics_Lectures/Mechanics/mechanicsimages/lect%2022.gif

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Ch3_Lec2_Q3 (Points: 1)
1Three vectors are given as: A= (2i + 4k), B = (-i - j + 2k) and C = (j +k). The value ofA.(BxC) is: (Give your answer in three significant figures form)
Answer

4.00

والله اعلم

D7eeeM · February 9, 2013, 6:22pm

طريقة الحل ؟

Computist · February 9, 2013, 6:28pm

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D7eeeM · February 9, 2013, 6:42pm

السؤال الثاني زي الموجود في ال sample problem P49 ؟

f.c.m · February 9, 2013, 6:57pm

شباب في الهومورك الخامس السؤال الثالث وش قصدة بـ "The value" ؟؟
**يعني يبي "**magnitude" ولا كيف؟

Dark_Passenger · February 9, 2013, 7:11pm

^
أصلا إذا ضربتها في بعض بيطلع لك عدد مب فيكتور… يعني ما تقدر تطلع الـmagnitude

Azooz_Jk · February 9, 2013, 7:14pm

السوال الاخير ماعرفتلو …

f.c.m · February 9, 2013, 7:17pm

انا فاهم عليك
بس الي ما فهمته هو وش يبي في النهاية
يعني انا عندي الفيكتور النهائي بالسؤال وش يبي ب كلمة the value

Dark_Passenger · February 9, 2013, 7:21pm

^
اجمع الأرقام زي الأخ هذا

http://im34.gulfup.com/W4afH.jpg

Azooz_Jk · February 9, 2013, 7:26pm

امممم
كيف غير اشارة الـ minsI x J = mInus k ?

الــk ليش ماينس ؟