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মেকানিক্যাল ইঞ্জিনিয়ারিং

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1831. MCQPractice set · Question 91

একটি 2 kg body rest থেকে 4 m/s পেলে momentum change কত?

a.
2
b.
4
c.
8
d.
16 kg·m/s

Correct answer: c

Δp=mΔv=2×4=8 kg·m/s।

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1832. MCQPractice set · Question 92

দুই equal mass-এর head-on elastic collision-এ প্রথমটি u এবং দ্বিতীয়টি rest হলে final velocities কী?

a.
প্রথম rest, দ্বিতীয় u
b.
দুটিই u
c.
প্রথম u, দ্বিতীয় rest
d.
দুটিই zero

Correct answer: a

Equal masses-এর elastic collision-এ velocities exchange হয়।

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1833. MCQPractice set · Question 93

একটি 1 kg body 4 m/s east এবং 1 kg body 2 m/s west; stick করলে final velocity কত?

a.
1 m/s east
b.
2 m/s east
c.
1 m/s west
d.
6 m/s

Correct answer: a

Net p=4−2=2; total mass 2, তাই v=1 m/s east।

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1834. MCQPractice set · Question 94

একটি 3 kg body 2 m/s east এবং 1 kg body 6 m/s west; stick করলে final velocity কী?

a.
0
b.
3 m/s east
c.
3 m/s west
d.
12 m/s

Correct answer: a

Initial p=6−6=0, তাই common final velocity zero।

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1835. MCQPractice set · Question 95

Initially rest firecracker দুই equal fragment-এ ভাগ হলে fragments-এর speed relation কী?

a.
সমান opposite
b.
একই direction
c.
একটির দ্বিগুণ
d.
দুটিই zero

Correct answer: a

Equal masses ও equal opposite momenta হলে speeds equal opposite।

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1836. MCQPractice set · Question 96

Initially rest system-এর explosion-এ one fragment-এর momentum 12 east হলে other-এর momentum কী?

a.
12 west
b.
12 east
c.
0
d.
24 west

Correct answer: a

Total momentum zero রাখতে equal opposite momentum দরকার।

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1837. MCQPractice set · Question 97

একটি 2 kg fragment 6 m/s east-এ গেলে 1 kg fragment-এর speed কত, initial system rest?

a.
3 m/s west
b.
6 m/s west
c.
12 m/s west
d.
0

Correct answer: c

0=2×6+1v, তাই v=−12 m/s; speed 12 m/s west।

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1838. MCQPractice set · Question 98

External force থাকলে system momentum change কীসের সমান?

a.
external impulse
b.
kinetic energy
c.
mass product
d.
internal energy only

Correct answer: a

ΔP=J_external।

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1839. MCQPractice set · Question 99

Momentum conservation-এর জন্য internal forces-এর nature কী?

a.
equal and opposite pair
b.
same direction pair
c.
zero pair always
d.
random

Correct answer: a

Newton's third law internal impulses cancel করে।

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1840. MCQPractice set · Question 100

একটি isolated system-এর momentum vector-এর x-component conserved হলে কী বোঝায়?

a.
x-direction-এ external impulse zero
b.
y-direction-এ force maximum
c.
mass zero
d.
kinetic energy zero

Correct answer: a

Component-wise conservation-এ সংশ্লিষ্ট direction-এর external impulse zero থাকতে হয়।

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