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Showing posts from January 20, 2008

Swami Vivekananda

Biography of Swami Vivekananda Birth and Early life Narendranath Dutta was born in Shimla Pally, Kolkata, West Bengal, India on 12 January 1863 as the son of Viswanath Dutta and Bhuvaneswari Devi. Even as he was young, he showed a precocious mind and keen memory. He practiced meditation from a very early age. While at school, he was good at studies, as well as games of various kinds. He organized an amateur theatrical company and a gymnasium and took lessons in fencing, wrestling, rowing and other sports. He also studied instrumental and vocal music. He was a leader among his group of friends. Even when he was young, he questioned the validity of superstitious customs and discrimination based on caste and religion. In 1879, Narendra entered the Presidency College, Calcutta for higher studies. After one year, he joined the Scottish Church College, Calcutta and studied philosophy. During the course, he studied western logic, western philosophy and history of European nations. There star
क्या पृथ्वी का वज़न मापा जा सकता है! पृथ्वी का वज़न जानने के बजाय यह पूछना बेहतर होगा कि पृथ्वी का द्रव्यमान क्या है क्योंकि वज़न गुरुत्वाकर्षण क्षेत्र से तय होता है. उदाहरण के लिए एक गेंद का वज़न पृथ्वी पर जितना है वह चंद्रमा पर केवल उसका छठा हिस्सा होगा लेकिन द्रव्यमान वही रहता है. वैज्ञानिकों का अनुमान है कि पृथ्वी का द्रव्यमान लगभग 60 करोड़ खरब टन है. यानी 6 के बाद आपको 21 शून्य लगाने पड़ेंगे. वज़न का अनुमान इस आधार पर लगाया जाता है कि पृथ्वी के आस-पास के पदार्थों के लिए उसकी गुरुत्वाकर्षण शक्ति कितनी है. जाने माने भौतिक शास्त्री और गणितज्ञ न्यूटन ने इसके लिए समीकरण दिया है लेकिन उसकी यहां व्याख्या करना संभव नहीं. साभार bbc