An isotonic contraction can be concentric, which is where the muscle shortens as the fibres contract or eccentric, where the fibres contract as the muscle lengthens. When a muscle contracts with no resulting movement, it is an isometric contraction. Page: 1  1. 2  2.
If you will use a different paint on your home's trim, subtract 21 square feet for every door and 15 square feet for each typical window. Divide the final figure by the square-foot coverage specified on the can of paint to determine the number of gallons you will need for one coat.
Painting the House Yourself. Add up the cost of all the supplies you will need such as paint, rollers and brushes. One gallon of paint covers approximately 350 to 400 square feet. The cost of the paint can vary a lot depending on the quality of the paint you buy and whether it is interior or exterior paint.ne gallon of paint covers approximately 350 to 400 square feet. The cost of the paint can vary a lot depending on the quality of the paint you buy and whether it is interior or exterior paint.