Question

14)A person whose mass is ?=72.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle ?=28.7∘ with the horizontal. What is the reading on the scale?
reading_______kg

17) A 3.980 kg block of wood rests on a steel desk. The coefficient of static friction between the block and the desk is ?s=0.555 and the coefficient of kinetic friction is ?k=0.205. At time ?=0, a force ?=13.3 N is applied horizontally to the block. State the force of friction applied to the block by the table at times ?=0 and ?>0.

?=0_____N.   ?>0_____N

Consider the same situation, but this time the external force ? is 26.9 N. Again, state the force of friction acting on the block at times ?=0 and ?>0.

?=0_____N.   ?>0_____N

Answer 1

14. Fu = mg caso a fi ☆ Fn = (72) (9.8) (as 28.7 mg fu (172 ces 28-7) 63.2g Angs 63.2 kg 17. =I9N N = mg 21.65 N Ms N fsmax fe (3.980 kg ) (9.80 1834 10.555)(39) = (0.205) (19) 8N MEN = > t=0; 13.3 N co F <fsmen It will not more to ; 11.3N cm f> Esmer t=0; 21.65N * f = fk tao; IN CS Scanned with CamScanner