(1) A 100kg block is started with a speed of 2.0m/s on a long, rough belt kept fixed in a horizontal position. The coefficient of kinetic friction between the block and the belt is 0.20. Consider the situation from a frame of reference moving at 2.0m/s along the initial velocity of block. Find the work done in this frame by the external force holding the belt.(2)A ball is dropped on a floor from a height of 2.0m. After the collision it rises up 2 a height of 1.5m Assume that 40% of mechanical energy lost goes as thermal energy into the ball. Calculate the rise in temperature of the ball in the collision. Heat capacity of the ball is 800J/K(3) A metal block of density 6000kg/m^3 and mass 1.2 kg is suspended through a spring of spring constant 200N/m. The spring-block system is dipped in water kept in a vessel. The water has a mass of 260g and the block is at a height of 40cm above the bottom of the vessel. If the support 2 the spring is broken, what will be the rise in temperature of the water. Specific heat capacity of the block is 250J/kg-K and that of water is 4200J/kg-K. Heat capacities of the vessel and the spring are nelgligible.Also if possible, please answer this questions alsohttp://www.goiit.com/posts/list/heat-thermodynamics-glass-tube-questions-24600.htm

Kevin Nash , 10 Years ago

Grade upto college level