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ইন্ডাস্ট্রিয়াল এন্ড প্রোডাকশন ইঞ্জিনিয়ারিং

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2281. MCQPractice set · Question 33

20 N বল 2 m displacement-এ 60° কোণে কাজ করে। কাজ কত?

a.
20.0 J
b.
40.0 J
c.
10.0 J
d.
0 J

Correct answer: a

Work = Fs cos60° = 20×2×cos60° = 20.0 J।

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2282. MCQPractice set · Question 34

5 kg ভরের বস্তুর বেগ 6 m/s হলে kinetic energy কত?

a.
90.0 J
b.
30.0 J
c.
2.5 J
d.
36.0 J

Correct answer: a

K = ½mv² = ½×5×6² = 90.0 J।

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2283. MCQPractice set · Question 35

7 kg ভরবিশিষ্ট বস্তুকে 4 m উপরে উঠালে potential energy change কত, g=10?

a.
280 J
b.
70 J
c.
40 J
d.
28 J

Correct answer: a

ΔU = mgh = 7×10×4 = 280 J।

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2284. MCQPractice set · Question 36

450 J কাজ 8 s-এ সম্পন্ন হলে power কত?

a.
56.2 W
b.
3600.0 W
c.
28.1 W
d.
8 W

Correct answer: a

P = W/t = 450/8 = 56.2 W।

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2285. MCQPractice set · Question 37

15 N বল 2 m displacement-এ 30° কোণে কাজ করে। কাজ কত?

a.
0.0 J
b.
30.0 J
c.
7.5 J
d.
0 J

Correct answer: a

Work = Fs cos30° = 15×2×cos30° = 0.0 J।

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2286. MCQPractice set · Question 38

3 kg ভরের বস্তুর বেগ 5 m/s হলে kinetic energy কত?

a.
37.5 J
b.
15.0 J
c.
1.5 J
d.
25.0 J

Correct answer: a

K = ½mv² = ½×3×5² = 37.5 J।

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2287. MCQPractice set · Question 39

6 kg ভরবিশিষ্ট বস্তুকে 4 m উপরে উঠালে potential energy change কত, g=10?

a.
240 J
b.
60 J
c.
40 J
d.
24 J

Correct answer: a

ΔU = mgh = 6×10×4 = 240 J।

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2288. MCQPractice set · Question 40

490 J কাজ 8 s-এ সম্পন্ন হলে power কত?

a.
61.2 W
b.
3920.0 W
c.
30.6 W
d.
8 W

Correct answer: a

P = W/t = 490/8 = 61.2 W।

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2289. MCQPractice set · Question 41

10 N বল 2 m displacement-এ 0° কোণে কাজ করে। কাজ কত?

a.
20.0 J
b.
20.0 J
c.
5.0 J
d.
0 J

Correct answer: a

Work = Fs cos0° = 10×2×cos0° = 20.0 J।

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2290. MCQPractice set · Question 42

7 kg ভরের বস্তুর বেগ 4 m/s হলে kinetic energy কত?

a.
56.0 J
b.
28.0 J
c.
3.5 J
d.
16.0 J

Correct answer: a

K = ½mv² = ½×7×4² = 56.0 J।

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