Achild pushes her toy across a level floor at a steady velocity of 0.50 m/s using an applied force of 2.0 n. if the weight of the toy is 8.0 n, what is the coefficient of sliding friction between the toy and the floor?
a. 0.25
b. 1.0
c. 4.0
d. 0.40

a. 0.25

Explanation:

The toy is moving across the floor at constant velocity - this means that its acceleration is zero.

According to Newton's second law, this means that the net force acting on the toy is zero:

(1)

because a=0.

The net force, in this case, consists of two forces acting in opposite directions:

- The applied force, F = 2.0 N

- The frictional force,

where is the coefficient of sliding friction and (mg)=8.0 N is the weight of the toy.

Therefore, the equation of the forces (1) becomes:

answer: d. a cme increases the amount of energy in the solar wind

explanation:

coronal mass ejections, also called cmes, are large clouds of plasma and magnetic field that erupt from the sun. only when the cloud is aimed at earth will the cme hit earth and therefore cause impacts. high-speed solar wind streams come from areas on the sun known as coronal holes.

answer(20) psi;