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To give you an idea: * A work of one joule is required to lift a mass of 102 grammes (a small book) one meter. * A 40-watt light-bulb uses 40 joules every second.

To give you an idea: * A work of one joule is required to lift a mass of 102 grammes (a small book) one meter. * A 40-watt light-bulb uses 40 joules every second.

To give you an idea: * A work of one joule is required to lift a mass of 102 grammes (a small book) one meter. * A 40-watt light-bulb uses 40 joules every second.

To give you an idea: * A work of one joule is required to lift a mass of 102 grammes (a small book) one meter. * A 40-watt light-bulb uses 40 joules every second.

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