A)Could electronic devices charge themselves without being plugged into an electricity source? b)Does the negative mass of antimatter mean that it's gravitationally repelled from stars?
c)How can a material at a certain temperature have all of its molecules at the same energy?
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If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

One object has a mass of 1 kg and another object has a mass of 3 kg. if the speeds are the same, which of the following is true about their kinetic energy?