#Phy tip question #1. What the cross- product of | መርጌታ መላክ የባህል ህክምና መዳኒት ቀማሚ

#Phy tip question

#1. What the cross- product of vector
U=3i+2j-4k
V= 4i-6j
A. 24i + 16j +26k B. 7i - 4j - 4k C. -24i -16j -26k D. 12i - 12j

Answer the questions from 2 up to
2 based the information given below
The position of a certain particle moving along the X axis is given by the equation x (t) = 6 + 8t + 2t^2
Where x is measured in meter and t is measured in second.

#2 What is the average velocity b/n 0 second and 3 second?
A. 48m/s B. 42m/s C. 6m/s D. 16m/s
#3 What is the instantaneous velocity at 2 second?
A. 1.6m/s B. 16m/s C. 8m/s D. 0.8m/s
#4 What is the instantaneous acceleration?
A. 1m/s2
B. 2m/s2
C. 3m/s2
D. 4m/s2
#5 What is the average acceleration b/n 0 second and 2 second?
A. 2m/s2
B. 4m/s2
C. 3m/s2
D. 1m/s2
#6 A stone thrown vertically up ward with an initial velocity of 10m/s what is the minimum length the
stone can have?
A. 4m B. 5m C. 6m D. 8M
#7 In the question above how long does it take to reach the maximum height?
A. 1sec B. 4sec C. 2sec D. 5sec
#8. A voltmeter reads 0.8volt before measurement begun. What kind of error can the voltmeter cause?
A. random error B. Parallax error C. Zero error D. None of the above
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