Physics
A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is

Less than the weight of the man
Zero
Same as the weight of the man
Greater than the weight of the man

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Physics
The mass defect is the result of what action occurring?

Energy being converted into moles of atoms when neutrons break apart protons
Mass being converted to energy when protons and neutrons break apart in a nucleus
Mass being converted to energy when protons and neutrons bind together in a nucleus
Protons and electrons being attracted to each other

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