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The number of coins, each of radius 0.75...

The number of coins, each of radius 0.75 cm and thickness 0.2 cm, to be melted to make a right circular cylinder of height 8 cm and radius 3 cm, is
0.75 सेमी त्रिज्या तथा 0.2 सेमी मोटाई वाले सिक्कों, जिन्हें पिघलाकर 3 सेमी त्रिज्या तथा 8 सेमी ऊँचाई वाला एक लम्बवृत्तीय बेलन बनाया जाता है, तो सिक्के की संख्या होगी?

A

500

B

600

C

460

D

640

Text Solution

Verified by Experts

The correct Answer is:
D
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A cylinder with base radius 8 cm and height 2 cm is melted to form a cone of height 6 cm. The radius of the cone will be:- 8 सेमी आधार त्रिज्या और 2 सेमी ऊँचाई वाले सिलेडर को 6 सेमी ऊंचा शंकु बनाने के लिए गलाया जाता है। शंकु की त्रिज्या क्या होगी?

A solid sphere of radius 3 cm is melted to form a hollow right circular cylindrical tube of length 4 cm and external radius 5 cm. The thickness of the tube is 3 से.मी. त्रिज्या वाले एक ठोस गोलक पिघलाकर 4 से.मी. लंबी एक खोखली लंब वृत्तीय बेलनाकार ट्यूब बनाई गई है और उसकी बाह्य त्रिज्या 5 सेमी. है। इस ट्यूब की मोटाई बताइए।

A copper wire of radius 0.5 mm and length 42 2/3 m is melted and converted into a sphere of radius R cm. What is the value of R? त्रिज्या 0.5 mm और लंबाई 42 2/3 मी वाले एक ताम्बे के तार को पिघलाकर त्रिज्या R सेमी वाले एक गोले का रूप दिया जाता है |R का मान क्या है ?

A solid metal sphere has radius 14 cm. it is melted to from small cones of radius 1.75 cm and height 3.5 cm. How many small cones will be obtained from the sphere? एक धातु के ठोस गोले को त्रिज्या 14 से.मी. है। इसे पिघलाकर 1.75 से.मी. त्रिज्या तथा 3.5 से.मी ऊँचाई वाले शंकुओ मे बनाया गया। गोले से कितने छोटे शंकु बनाए जा सकते हैं?

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