Fill in the blank with the term that best completes the following sentences.
1 The
variable in an investigation is the variable that is
deliberately manipulated.
2 The
variable in an investigation is the variable
that changes in response to changes in the
investigation.
3 A(n)
be a physical or mathematical representation of
an object or a process.
can

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.