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ফুড ইঞ্জিনিয়ারিং

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1791. MCQPractice set · Question 51

Momentum conservation-এর সঙ্গে Newton's third law-এর relation কী?

a.
internal action-reaction cancellation momentum conservation দেয়
b.
তাদের কোনো relation নেই
c.
third law energy conservation দেয়
d.
first law mass conservation দেয়

Correct answer: a

Internal equal-opposite forces-এর net impulse zero হওয়াই মূল কারণ।

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1792. MCQPractice set · Question 52

শেষ পর্যন্ত isolated system-এ total momentum কেন constant?

a.
external net impulse zero
b.
সব body rest-এ
c.
mass zero
d.
kinetic energy zero

Correct answer: a

F_ext=dp_total/dt=0, তাই total momentum অপরিবর্তিত।

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1793. MCQPractice set · Question 53

3 kg body 4 m/s east এবং 1 kg body 2 m/s west হলে total momentum কত?

a.
10 east
b.
14 east
c.
10 west
d.
2 east

Correct answer: a

P=3×4−1×2=10 kg·m/s east।

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1794. MCQPractice set · Question 54

2 kg body 5 m/s east এবং 3 kg body 2 m/s west হলে total momentum কত?

a.
4 east
b.
10 east
c.
16 east
d.
4 west

Correct answer: a

P=2×5−3×2=4 kg·m/s east।

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1795. MCQPractice set · Question 55

একটি 5 kg body rest-এ; explosion-এর পরে 2 kg fragment 10 m/s east গেলে 3 kg fragment-এর speed কত?

a.
20/3 m/s west
b.
10 m/s east
c.
5 m/s west
d.
20 m/s east

Correct answer: a

0=2×10+3v, তাই v=−20/3 m/s।

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1796. MCQPractice set · Question 56

একটি 6 kg body rest-এ বিস্ফোরিত হয়ে 2 kg fragment 9 m/s east যায়; 4 kg fragment কী speed পায়?

a.
4.5 m/s west
b.
9 m/s east
c.
18 m/s west
d.
3 m/s east

Correct answer: a

0=2×9+4v, তাই v=−4.5 m/s।

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1797. MCQPractice set · Question 57

1 kg bullet 100 m/s east এবং 9 kg gun initially rest; gun recoil speed কত?

a.
100/9 m/s west
b.
900 m/s east
c.
10 m/s east
d.
100 m/s west

Correct answer: a

0=1×100+9v, তাই v=−100/9 m/s।

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1798. MCQPractice set · Question 58

Bullet-এর mass অর্ধেক কিন্তু speed একই হলে recoil momentum কী হবে?

a.
অর্ধেক
b.
দ্বিগুণ
c.
অপরিবর্তিত
d.
চার গুণ

Correct answer: a

Bullet momentum p=mv; mass অর্ধেক হলে p অর্ধেক।

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1799. MCQPractice set · Question 59

একটি 2 kg body 6 m/s east-এ চলছিল; 1 kg body rest-এ stick করলে final speed কত?

a.
2 m/s east
b.
3 m/s east
c.
4 m/s east
d.
6 m/s east

Correct answer: c

12=(2+1)v, তাই v=4 m/s east।

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1800. MCQPractice set · Question 60

2 kg ও 3 kg body-এর velocities 4 m/s east ও 2 m/s east; stick করলে speed কত?

a.
2.4 m/s
b.
2.8 m/s
c.
3.2 m/s
d.
6 m/s

Correct answer: b

v=(8+6)/5=14/5=2.8 m/s।

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