2.1 Draw a labelled force diagram which shows all the forces acting on the block.
2.2
Calculate the gravitational force of the block when the force in the rope is 8 N.
Activity 3:
A block, of mass 20 kg, is pulled upwards by force F along a plane indine at 30° to the horizontal. It
accelerates along the incline plane at 2 m-s'. The surface of the incline exerts a friction forc
e on the
block.
3.1
Draw a diagram showing all the forces acting on the block (force diagram) as it move up the
incline. Also draw a free-body diagram for the block. Represent the forces on the Cartesian
plane and resolve the gravitational force into components.
Calculate the component of the gravitational force exerted on the block parallel to the
Incline
3.2
3.3
Calculate the normal force.
3.4
Calculate the friction force If the magnitude of is equal to 200 N.
3.5
Calculate the coefficient of kinetic friction for the block.​

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.