16 August, 10:22

# A uniform solid sphere rolls down an incline. A) What must be the incline angle (deg) if the linear acceleration of the center of the sphere is to have a magnitude of 0.21g? B) If a frictionless block were to slide down the incline at that angle, would its acceleration magnitude be more than, less than, or equal to 0.21g?

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1. 16 August, 10:34
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a) θ = 12.12°

b) equal to 0.21g

Explanation:

Solution:-

Declare variables:

- The mass of solid sphere, m

- The inclination angle, θ

- The linear acceleration a down the slope of the solid sphere is a = 0.21g

Where, g: The gravitational acceleration constant.

- The component of weight of solid sphere directed down the slope is given by:

Ws = m*g*sin (θ)

- Apply Newton's second law of motion down the slope, state:

F_net = m*a

- The only net force acting on the solid sphere is the Weight. So, the equation of motion in the coordinate axis (down the slope).

Ws = m*a

m*g*sin (θ) = m*0.21*g

- Solve for inclination angle (θ):

sin (θ) = 0.21

θ = arcsin (0.21)

θ = 12.12°

- If a friction-less block of mass (m) moves down the same slope then block has weight component down the slope as:

Wb = m*g*sin (θ)

- Apply Newton's second law of motion down the slope, state:

F_net = m*a

- The only net force acting on the solid sphere is the Weight. So, the equation of motion in the coordinate axis (down the slope).

Ws = m*a

m*g*sin (θ) = m*a

- Solve for linear acceleration (a):

g*sin (θ) = a

a = sin (12.12) * g

a = 0.21g

Answer: The acceleration is independent of mass and only depends on the inclination angle θ.