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কম্পিউটার সায়েন্স এন্ড ইঞ্জিনিয়ারিং

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1821. MCQPractice set · Question 81

একটি 4 kg system-এর দুই fragment masses 1 kg ও 3 kg; lighter fragment speed 12 m/s east হলে heavier speed কত?

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

Correct answer: a

1×12+3v=0, তাই v=−4 m/s।

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1822. MCQPractice set · Question 82

একটি 2 kg body 4 m/s east এবং 2 kg body 4 m/s west collision-এর আগে total kinetic energy কত?

a.
8 J
b.
16 J
c.
32 J
d.
4 J

Correct answer: c

প্রতিটি KE=16 J, total=32 J।

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1823. MCQPractice set · Question 83

দুই equal opposite momentum body stick করলে final kinetic energy কী?

a.
0
b.
initial-এর সমান
c.
দ্বিগুণ
d.
infinite

Correct answer: a

Total momentum zero এবং common velocity zero, তাই final KE zero।

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1824. MCQPractice set · Question 84

Momentum conserved কিন্তু KE কমে গেলে collision কী?

a.
inelastic
b.
elastic
c.
no collision
d.
static equilibrium

Correct answer: a

Inelastic collision-এ momentum conserved, KE dissipated হয়।

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1825. MCQPractice set · Question 85

Momentum conservation-এর সবচেয়ে সাধারণ mathematical form কী?

a.
Σp_initial=Σp_final
b.
ΣF_initial=ΣF_final
c.
ΣK=0
d.
Σm=0

Correct answer: a

System-এর সব body-এর vector momenta যোগ করে equality লেখা হয়।

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1826. MCQPractice set · Question 86

শেষ পর্যন্ত conservation of momentum কোন law-এর উপর ভিত্তি করে?

a.
Newton's third law
b.
Newton's first law only
c.
Hooke law
d.
Ohm's law

Correct answer: a

Internal action-reaction forces cancel হওয়ায় total momentum conservation পাওয়া যায়।

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1827. MCQPractice set · Question 87

একটি 4 kg body 5 m/s-এ চললে momentum কত?

a.
9
b.
20
c.
25
d.
1.25

Correct answer: b

p=mv=4×5=20 kg·m/s।

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1828. MCQPractice set · Question 88

Momentum 30 kg·m/s এবং mass 6 kg হলে speed কত?

a.
5 m/s
b.
6 m/s
c.
24 m/s
d.
36 m/s

Correct answer: a

v=p/m=30/6=5 m/s।

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1829. MCQPractice set · Question 89

একটি body-এর momentum 15 থেকে 5 kg·m/s হলে impulse কত?

a.
−10 N·s
b.
10 N·s
c.
20 N·s
d.
75 N·s

Correct answer: a

J=Δp=5−15=−10 N·s।

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1830. MCQPractice set · Question 90

10 N·s impulse 2 s-এ প্রয়োগ হলে average force কত?

a.
2 N
b.
5 N
c.
10 N
d.
20 N

Correct answer: b

F_avg=J/Δt=10/2=5 N।

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