A one-story building has three floors on the ground floor and 20 floors on the ground. Each floor on the ground is 5 meters high, while each floor is 6 meters high. An elevator in it travels 1 meter per second. It lives on the 10th floor from Pritam. He wants to meet his friend on the second floor on the ground floor. So how long will it take him to get to the elevator on the second floor?
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540 calories of heat is required to vaporize the one gram of water at 100 C . determine the entropy change involved in vaporizing 5gm of water. (1 calorie=4.2j)
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