HELP How much heat energy is released when 6.29g of copper cools from 135.0°C to 50.0°C? The specific heat of coppers 0.385 J/g°C. (Include your calculation to receive credit.)

1) a child holds two dogs on two separate leads. the dogs are pulling in different directions. one is pulling a force of 20n north and one is pulling 15n eastwards. calculate the resultant force on the child. state the direction. (use the parallelogram of forces) 2) a force of 20n acts horizontally on an object. a second force of 5n acts at 60 degrees to the first one. calculate the resultant force. worth 20 points, need answers asap with method you x