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The dial of a scale looks like this: 00.0kg. A physicist placed a spring on it....

The dial of a scale looks like this: 00.0kg. A physicist placed a spring on it. The dial read 00.6kg. He then placed a metal chain on the scale, it read 02.1kg. The physicist, then decided to test Einstein’s equation, and compressed the spring and tied it with the chain and placed it on the scale. It read 02.7kg. Which of the following conclusions is the most likely the physicist will come to?

a. Einstein’s equation has an error

b. The scale is broken

c. Compressing the spring didn’t add energy

d. The scale’s resolution is too low to read the change in mass

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