Q4. Consider the skier on a slope shown in the figure below. Her mass including equipment is 55.0 kg.
(a) What is her acceleration if friction is negligible?
(b) What is her acceleration if friction is known to be 45.0 N?

Part a)

When there is no friction then acceleration is

Part b)

if there is friction force along the inclined then acceleration is

Explanation:

Part a)

As we know that the skier is on inclined plane

So here if there is no friction then net force along the inclined plane is given as

now acceleration of the skier is given as

Part b)

if there is friction force along the inclined then net force along the inclined plane is given as

now acceleration of the skier is given as

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation: