icaijy

11 Sep 2026, 8:36 a.m.

18367 score

3 correct × 61 movement score = 183

67 × VCE evidence60.8 seconds · bandwidth-limited recordingDownload video

01 A student is checking a worked solution. A vector calculation returns magnitude −4. The correct interpretation is

A the vector points down This does not satisfy the stated relationship.

B a magnitude cannot be negative, so the setup or output is wrong Magnitude is a non-negative scalar.

C the vector points left This does not satisfy the stated relationship.

D the magnitude is −4 This does not satisfy the stated relationship.

Written for icaijy.com · U1–2 · Modelling · answered at 10140 ms

02 Which response best completes this VCE-style item? The angle between (1,0) and (1,1) is

A \(\pi/4\) The dot-product cosine is 1/√2.

B \(\pi/2\) This does not satisfy the stated relationship.

C \(3\pi/4\) This does not satisfy the stated relationship.

D \(\pi\) This does not satisfy the stated relationship.

Written for icaijy.com · U1–2 · Vectors · answered at 20891 ms

03 During a one-minute revision round: \((2+i)(3-i)=\)

A \(5-i\) This does not satisfy the stated relationship.

B \(6-i\) This does not satisfy the stated relationship.

C \(7+i\) Expand and use i²=−1.

D \(7-i\) This does not satisfy the stated relationship.

Written for icaijy.com · U1–2 · Complex arithmetic · answered at 33318 ms

04 A vector calculation returns magnitude −4. The correct interpretation is

A a magnitude cannot be negative, so the setup or output is wrong Magnitude is a non-negative scalar.

B the vector points down This does not satisfy the stated relationship.

C the vector points left This does not satisfy the stated relationship.

D the magnitude is −4 This does not satisfy the stated relationship.

Written for icaijy.com · U1–2 · Modelling · answered at 38336 ms

05 For \(\vec a=(1,2,2)\), \(|\vec a|=\)

A \(\sqrt5\) This does not satisfy the stated relationship.

B 3 \(\sqrt{1+4+4}=3\).

C 5 This does not satisfy the stated relationship.

D 9 This does not satisfy the stated relationship.

Written for icaijy.com · U1–2 · Vectors · answered at 45700 ms

06 A complete graph \(K_6\) has how many edges?

A 6 This does not satisfy the stated relationship.

B 15 \(6\times5/2=15\).

C 30 This does not satisfy the stated relationship.

D 12 This does not satisfy the stated relationship.

Written for icaijy.com · U1–2 · Graphs · answered at 57014 ms

07 The angle between (1,0) and (1,1) is

A \(\pi\) This does not satisfy the stated relationship.

B \(\pi/4\) The dot-product cosine is 1/√2.

C \(\pi/2\) This does not satisfy the stated relationship.

D \(3\pi/4\) This does not satisfy the stated relationship.

Written for icaijy.com · U1–2 · Vectors · not answered before time expired