Because it is important to know the composition of the object
Density is the ratio of the mass of a sample to the volume occupied by that mass, and expresses how much mass there is per unit volume of a given portion of matter. Density is a physical property of extreme importance in the characterization, identification and use of substances or materials.
1. Command economy- The idea behind this type of economy makes it so that the government can ensure that everyone has equal access to resources. The goal is to provide everyone with enough resources to live and thrive.
2. Mixed economy- A mixed economy is a combination of a command economy (in which the government decides how many products will be made) and a market economy (one in which the consumer dictates how many products will be made).
3. Mixed economy- In almost every country, there are elements of both a market economy and command economy. Having a "perfect" market economy or a "perfect" command economy is not really possible, as we do not live in a perfect world. The best ideas from each system need to be used in order to have a practical and rational economy.
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At the Yalta Conference in February, 1945, Stalin had agreed to enter the war against Japan three months after Germany was defeated. Victory in Europe was achieved on May 8, 1945. The Soviet Union declared war on Japan on August 8, 1945, and invaded Manchuria with over a million troops to take on the Japanese army there.
As to the dropping of the second atomic bomb, even the dropping of the first could be challenged when factoring in the USSR. An option to dropping atomic bombs was to enlist Soviet troops in a joint invasion of Japan. But the USA wanted to avoid postwar Soviet presence in Japan, and the atomic bombs were seen as a way of ending the war quickly. As to the use of a second bomb at Nagasaki after the first was dropped on Hiroshima, it was because of the Allies' requirement that Japan submit to an unconditional surrender. They did not do so in the immediate aftermath of the Hiroshima bombing, so the second bomb was used. You can consider for yourself whether some other resolution besides "unconditional surrender" was a viable option.
