Part one:
a block is at rest on the incline shown in
the figure. the coefficients of static and kinetic friction are µs = 0.75 and µk = 0.64,
respectively.
the acceleration of gravity is 9.8 m/s^2.
what is the frictional force acting on the
42 kg mass?
answer in units of n.

part two:
what is the largest angle which the incline
can have so that the mass does not slide down
the incline?
answer in units of ◦

part three:
what is the acceleration of the block down
the incline if the angle of the incline is 44 ◦?
answer in units of m/s^2

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.

What type of electromagnetic radiation has a shorter wavelength than blue light

4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s. circle one: ke / gpe / both show your work for finding the values of each type of energy the object has: