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Question
100 kg ভরের একজন লোক প্রতিটি 25 cm উঁচু 20 টি সিঁড়ি 10 s এ উঠতে পারেন । তাঁর ক্ষমতা কত ?
365.54
490.50
500.00
550.00
ANSWER : 2
Descrption
<p style="margin-left:0px;"><strong>490.50 W</strong>।</p><p style="margin-left:0px;">ক্ষমতা হল কাজের হার। কাজ হল বল দ্বারা সরণ।</p><p style="margin-left:0px;">এখানে,</p><ul><li>ভর m = 100 kg</li><li>উচ্চতা h = 25 cm × 20 = 5 m</li><li>সময় t = 10 s</li></ul><p style="margin-left:0px;">অতএব,</p><p>W = mgh </p><p>W = 100 kg × 9.8 m/s^2 × 5 m </p><p>W = 4900 J </p><p>P = W/t </p><p>P = 4900 J/10 s </p><p>P = 490 W </p><p style="margin-left:0px;">অতএব, ব্যক্তির ক্ষমতা 490 W।</p>
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