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

the answer is definitely c.

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.