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সিভিল ইঞ্জিনিয়ারিং

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1571. MCQPractice set · Question 35

Vertical upward force applied হলে normal reaction কী হতে পারে?

a.
কমতে পারে
b.
বাড়তেই হবে
c.
অপরিবর্তিত সবসময়
d.
negative অবশ্যই

Correct answer: a

Upward pull weight-এর কিছু অংশ balance করলে N=mg−F_up হতে পারে।

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1572. MCQPractice set · Question 36

Horizontal block-এ frictionless surface-এ net horizontal force F হলে acceleration কী?

a.
F/m
b.
mF
c.
F+m
d.
0 সবসময়

Correct answer: a

F=ma থেকে a=F/m।

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1573. MCQPractice set · Question 37

Frictionless surface-এ 4 kg block-এ 12 N force দিলে acceleration কত?

a.
2 m/s²
b.
3 m/s²
c.
4 m/s²
d.
48 m/s²

Correct answer: b

a=12/4=3 m/s²।

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1574. MCQPractice set · Question 38

Frictionless surface-এ 5 kg block-কে 2 m/s² accelerate করতে force কত?

a.
2.5 N
b.
7 N
c.
10 N
d.
25 N

Correct answer: c

F=ma=5×2=10 N।

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1575. MCQPractice set · Question 39

Newton's second law-এর general momentum form কোনটি?

a.
F=dp/dt
b.
F=p/t²
c.
F=mv
d.
F=dx/dt

Correct answer: a

Net external force হলো momentum-এর time rate of change।

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1576. MCQPractice set · Question 40

Constant mass হলে F=dp/dt কীতে পরিণত হয়?

a.
F=ma
b.
F=mv
c.
F=m/a
d.
F=pa

Correct answer: a

p=mv এবং m constant হলে dp/dt=m dv/dt=ma।

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1577. MCQPractice set · Question 41

Impulse-এর formula কী?

a.
J=FΔt=Δp
b.
J=F/Δt
c.
J=mv²
d.
J=ma

Correct answer: a

Force-এর time integral momentum change দেয়।

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1578. MCQPractice set · Question 42

Impulse-এর SI unit কোনটি?

a.
N·s
b.
N/s
c.
J/s
d.
kg/s²

Correct answer: a

Impulse=force×time, unit N·s, যা kg·m/s-এর সমান।

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1579. MCQPractice set · Question 43

5 N force 4 s কাজ করলে impulse কত?

a.
1.25 N·s
b.
9 N·s
c.
20 N·s
d.
25 N·s

Correct answer: c

J=FΔt=5×4=20 N·s।

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1580. MCQPractice set · Question 44

Impulse vector-এর direction কী?

a.
force-এর direction
b.
force-এর perpendicular
c.
always downward
d.
zero সবসময়

Correct answer: a

Impulse force-এর time integral, তাই constant force-এর direction একই।

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