A machine has an efficiency of 60%. If the machine is required to overcome a load of 30N with a force of 20N. Calculate its mechanical advantage.
A body weighing 10N in air is partially immersed in water. It displaces water of mass 0.3kg. What is the upthrust on the body?(g = 10m/s\(^2\))
A mercury-in-glass thermometer reads -20º at the ice point and 100º at the steam point. Calculate the Celsius temperature corresponding to 70º on the thermometer.
A brass rod is 2 m long at a certain temperature. Calculate the linear expansion of the rod for a temperature change of 100 K. (Take linear expansivity of brass as 1.8 × 10\(^{-5}\) K\(^{-1}\))
A body of specific heat capacity 450 Jkg\(^{-1}\)K\(^{-1}\) falls to the ground from rest through a vertical height of 20 m. Assuming conservation of energy, calculate the change in temperature of the body striking the ground level. (g = 10 ms\(^{-2}\))
