After watching dramatic images of tsunamis coming ashore near Sendai, Japan, som
ID: 804348 • Letter: A
Question
After watching dramatic images of tsunamis coming ashore near Sendai, Japan, some of our students asked how "just water" could cause so much damage. The amount of energy carried by a tsunami is truly unimaginable, but Exercise 16.8 offers a comparison that may help. A cube of water 1 foot on a side (1 cubic foot, or 1 ft^3) weighs approximately 62 pounds. Imagine being hit by a 62-pound weight-it would certainly hurt. (a) Now imagine a low wall of water 10 feet wide, 1 foot deep, and 1 foot hight it would weigh lb. (b) A wall of water 30 feet high (like the Sendai tsunami), 1 foot deep, and 10 feet wide would weigh lb. (c) A wall of water 30 feet high, 5, 280 feet wide (a mile), and T foot deep would weigh lb. (d) To approximate a tsunami better: a wall of water 30 feet high, 5, 280 feet wide, and "only" 2, 640 feet deep would weigh lb. (e) One of the most powerful man-made objects is a modern railroad locomotive. A large locomotive weighs about 200 tons = 400,000 pounds. The impact of the conceptual tsunami in (d) above is equivalent to being hit by locomotives. This simple calculation should help you understand why "just water" can cause so much damage. And remember that a tsunami moves much faster than a locomotive.Explanation / Answer
Answer A 10 feet wide 1 feet deep 1 feet height will be 620 pounds.
Answer B 30 height 1 deep and 10 height will be equal to 18600 pounds.
Answer c the weights of 30 feet height, 5280 wide, and 1m deep will be 158400 pounds.
Answer d. The water with 30 feet height,5280 wide and 2640 deep will be equal to 418176000 pounds.
Answer e , this amount of water which has so much weight can cause a lot of damage to locomotive and many other things