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মেকানিক্যাল ইঞ্জিনিয়ারিং

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Questions

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1231. MCQPractice set · Question 34

Angular velocity-এর rate of change কী?

a.
angular acceleration
b.
linear velocity
c.
radius
d.
period

Correct answer: a

α=dω/dt।

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1232. MCQPractice set · Question 35

Uniform circular motion-এ angular velocity কেমন?

a.
constant magnitude
b.
zero সবসময়
c.
linearly increasing
d.
random

Correct answer: a

Uniform circular motion-এ equal time-এ equal angle swept হয়, তাই angular speed constant।

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1233. MCQPractice set · Question 36

Uniform circular motion-এ angular acceleration কত?

a.
zero
b.
g
c.
v²/r
d.
ω²

Correct answer: a

Angular velocity-এর magnitude constant, তাই α=0।

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1234. MCQPractice set · Question 37

Non-uniform circular motion-এ angular acceleration থাকতে পারে?

a.
হ্যাঁ
b.
না
c.
শুধু radius zero হলে
d.
শুধু rest-এ

Correct answer: a

Angular speed বদলালে angular acceleration non-zero হয়।

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1235. MCQPractice set · Question 38

Linear tangential acceleration aₜ ও angular acceleration α-এর relation কী?

a.
aₜ=rα
b.
aₜ=α/r
c.
aₜ=r/α
d.
aₜ=rα²

Correct answer: a

v=rω differentiate করলে aₜ=rα for constant radius।

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1236. MCQPractice set · Question 39

Angular acceleration α=3 rad/s², r=2 m হলে tangential acceleration কত?

a.
1.5 m/s²
b.
5 m/s²
c.
6 m/s²
d.
9 m/s²

Correct answer: c

aₜ=rα=2×3=6 m/s²।

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1237. MCQPractice set · Question 40

Centripetal acceleration-এর formula angular velocity দিয়ে কী?

a.
a_c=rω²
b.
a_c=rω
c.
a_c=ω/r
d.
a_c=r/ω²

Correct answer: a

a_c=v²/r=(rω)²/r=rω²।

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1238. MCQPractice set · Question 41

Centripetal acceleration-এর formula linear speed দিয়ে কী?

a.
v²/r
b.
vr
c.
v/r²
d.
r/v²

Correct answer: a

বৃত্তাকার motion-এ inward acceleration a_c=v²/r।

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1239. MCQPractice set · Question 42

r=2 m, ω=3 rad/s হলে centripetal acceleration কত?

a.
6 m/s²
b.
9 m/s²
c.
18 m/s²
d.
36 m/s²

Correct answer: c

a_c=rω²=2×9=18 m/s²।

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1240. MCQPractice set · Question 43

Angular velocity constant হলেও linear velocity vector কেন বদলায়?

a.
direction বদলায়
b.
magnitude সবসময় বদলায়
c.
radius zero
d.
time zero

Correct answer: a

Uniform circular motion-এ tangential direction continuously বদলায়।

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