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টেক্সটাইল ইঞ্জিনিয়ারিং

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1121. MCQPractice set · Question 59

Trajectory-এর highest point-এ tangent-এর angle কত?

a.
0°
b.
45°
c.
90°
d.
θ

Correct answer: a

Highest point-এ velocity horizontal, তাই tangent horizontal।

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1122. MCQPractice set · Question 60

Projectile landing point-এ velocity-এর vertical component কী?

a.
−u sinθ same-level case
b.
0
c.
u cosθ
d.
g

Correct answer: a

Symmetry অনুযায়ী landing-এর vertical component initial-এর সমান কিন্তু downward: −u sinθ।

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1123. MCQPractice set · Question 61

Same-level landing-এ final speed initial speed-এর তুলনায় কেমন?

a.
সমান
b.
অর্ধেক
c.
দ্বিগুণ
d.
zero

Correct answer: a

Horizontal component একই এবং vertical component-এর magnitude একই, তাই final speed u।

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1124. MCQPractice set · Question 62

Same-level projectile-এর launch ও landing velocity-এর horizontal components কেমন?

a.
সমান
b.
বিপরীত
c.
landing-এ zero
d.
দ্বিগুণ

Correct answer: a

Horizontal velocity constant u cosθ।

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1125. MCQPractice set · Question 63

Same-level projectile-এর launch ও landing velocity-এর vertical components কেমন?

a.
সমান sign-সহ
b.
সমান magnitude, বিপরীত sign
c.
দুটিই zero
d.
landing-এ দ্বিগুণ

Correct answer: b

Launch u sinθ upward, landing −u sinθ downward।

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1126. MCQPractice set · Question 64

Horizontal projection-এর ক্ষেত্রে initial vertical velocity কত?

a.
0
b.
u
c.
g
d.
u²

Correct answer: a

θ=0°, তাই uᵧ=u sin0°=0।

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1127. MCQPractice set · Question 65

Horizontal projection-এ vertical displacement-এর equation কী?

a.
y=½gt² downward
b.
y=ut
c.
y=u²t
d.
y=0 সবসময়

Correct answer: a

Initial vertical speed zero; falling distance ½gt²।

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1128. MCQPractice set · Question 66

Height h থেকে horizontal speed u-তে নিক্ষেপ করলে time to ground কত?

a.
√(2h/g)
b.
h/u
c.
u/g
d.
2h/g

Correct answer: a

h=½gt² থেকে t=√(2h/g)।

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1129. MCQPractice set · Question 67

Height h থেকে horizontal projection-এর range কত?

a.
u√(2h/g)
b.
uh/g
c.
u²/g
d.
h/u

Correct answer: a

R=u×time=u√(2h/g)।

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1130. MCQPractice set · Question 68

Horizontal projection-এ horizontal velocity পরিবর্তিত হয়?

a.
না, constant
b.
হ্যাঁ, g হারে
c.
zero হয়
d.
দ্বিগুণ হয়

Correct answer: a

Horizontal acceleration zero।

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