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মেকানিক্যাল ইঞ্জিনিয়ারিং

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রসায়ন

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গণিত

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Questions

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1091. MCQPractice set · Question 29

u=20 m/s, θ=30°, g=10 m/s² হলে range কত?

a.
10√3 m
b.
20√3 m
c.
40 m
d.
20 m

Correct answer: b

R=u²sin60°/g=400×√3/2/10=20√3 m।

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1092. MCQPractice set · Question 30

u=20 m/s, θ=30°, g=10 m/s² হলে maximum height কত?

a.
2.5 m
b.
5 m
c.
10 m
d.
20 m

Correct answer: b

H=400×sin²30°/(20)=400×1/4/20=5 m।

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1093. MCQPractice set · Question 31

u=20 m/s, θ=45°, g=10 m/s² হলে range কত?

a.
20 m
b.
30 m
c.
40 m
d.
80 m

Correct answer: c

R=u²/g=400/10=40 m।

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1094. MCQPractice set · Question 32

u=20 m/s, θ=45°, g=10 m/s² হলে maximum height কত?

a.
5 m
b.
10 m
c.
20 m
d.
40 m

Correct answer: b

H=u²sin²45°/(2g)=400×1/2/20=10 m।

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1095. MCQPractice set · Question 33

u=20 m/s, θ=45° হলে time to maximum height কত, g=10?

a.
1 s
b.
√2 s
c.
2 s
d.
4 s

Correct answer: b

tₕ=u sin45°/g=20/(10√2)=√2 s।

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1096. MCQPractice set · Question 34

u=10 m/s, θ=30°, g=10 হলে horizontal component কত?

a.
5 m/s
b.
5√3 m/s
c.
10 m/s
d.
0

Correct answer: b

uₓ=10cos30°=5√3 m/s।

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1097. MCQPractice set · Question 35

u=10 m/s, θ=30° হলে initial vertical component কত?

a.
5 m/s
b.
5√3 m/s
c.
10 m/s
d.
0

Correct answer: a

uᵧ=10sin30°=5 m/s।

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1098. MCQPractice set · Question 36

Projectile-এর path-এর highest point-এ acceleration কী?

a.
0
b.
g downward
c.
g upward
d.
horizontal

Correct answer: b

Highest point-এ vertical velocity zero হলেও gravity acceleration g downward থাকে।

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1099. MCQPractice set · Question 37

Highest point-এ projectile-এর speed কী?

a.
u sinθ
b.
u cosθ
c.
0
d.
u

Correct answer: b

Vertical component zero, horizontal component u cosθ থাকে; তাই speed u cosθ।

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1100. MCQPractice set · Question 38

Projectile-এর speed highest point-এ minimum কেন?

a.
vertical component zero
b.
horizontal component zero
c.
acceleration zero
d.
mass zero

Correct answer: a

Vertical velocity কমে zero হওয়ায় total speed-এর minimum value horizontal component।

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