The crankshaft in a race car goes from rest to 3120 rpm in 3.2a
what is the crankshaft angular acceleration?
how many revolutions does it makes while reaching 3120 rpm?

c

explanation:

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y

80cm/s.

24cm/s.

53.3cm/s.