The figure shows a uniform metre rule of weight 100 N balanced by a knife edge at the 10 cm mark and a cord attached at the 85 cm mark. What is the tension in the string?
What form of energy is present in the food we eat?
What magnitude of electric current can store 2.5 J of energy in a 3 H induction coil?
A machine has an efficiency of 80%. If the input work is 200J, the output work is?
A wooden block of relative density 0.4 floats in a liquid of density 1600 kg m\(^{-3}\). What fraction of its volume is immersed?
