21) An empty drum of mass 50 kg is resting on a shop floor. Find the co-efficient of rolling friction if a force of 100N makes it just move. (Assume g = 10 m/square second)
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Thermocouple, Thermometer and Pyrometers are used to measure temperature.
A mortise gauge is a Marking tool.
A mortise gauge is a woodworking tool used by a carpenter or joiner to scribe mortise and tenon joints on wood prior to cutting. Mortise gauges are commonly made of hardwood with brass fittings.