Question

A washing machine spin dryer has a period T. In order to triple the centripetal
acceleration of the clothes in the dryer the period should be ? 3T

A cube of mass 2.0 kg is kept pressed against a vertical wall by applying a horizontal
force of 60N. If the coefficient of friction between the cube and the wall is 0.50, the
frictional force between the cube and the wall is ? 19.6 N

The angle which vector J + (root3)K makes with the y axis is? Pi/3 radians?

Thanks.

Answer 1

Ac = v^2/R =
c = 2 pi R
Hey, you need to go faster, not slower !
T = c/v = 2 pi R/v
so
v^2 = (2 pi R)^2/T^2
v^2/R = {(2pi)^2/R T^2]

3 v^2/R = {(2pi)^2/R T^2] *3

so 3/T^2 = 1/T'^2
3 T'^2 = T^2
T'^2 = T^2/3
T' = T /sqrt 3

Answer 2

A cube of mass 2.0 kg is kept pressed against a vertical wall by applying a horizontal
force of 60N. If the coefficient of friction between the cube and the wall is 0.50, the
frictional force between the cube and the wall is ? 19.6 N
----------------------------
If the cube is not accelerating down, the frictional force is equal to the weight (and less than the coef times the normal force)
m g = 2* 9.81 = 19.6 right

Answer 3

tan theta = sqrt 3/1
theta = 60 deg = pi/3 right

Answer 4

Thank you Damon.

Answer 5

You are welcome :)

Answer 6

Thanks Damon