36 of 50 constants a 89.0-kg refrigerator sits on the floor. the coefficient of static friction between the refrigerator and the floor is 0.60. what is the minimum force that one needs to exert on the refrigerator to start the refrigerator sliding?

523.32 N

Explanation:

Frictional Force: This is a type of contact 523.force that opposes motion between two surface in contact. It is measured in newton. Mathematically, frictional force can be expressed as,

F = μR equation 1

Where F = frictional force, μ = coefficient of static friction, R = Normal reaction.

On a level surface, Normal reaction = Weight

Since the floor is a level surface,

R = W equation 2

Where W = weight of the refrigerator.

W = mg equation 3

m = mass of the refrigerator, g = acceleration due to gravity

Where m = 89 kg, g = 9.8 m/s²

Substituting these values into equation 3,

R = W = 89 × 9.8 = 872.2 N

∴ R = 872.2 N, μ= 0.6

also substituting this values into equation 1

F = 872.2 × 0.6

F = 523.32 N

The minimum force needed to make the refrigerator to slid = The force required to overcome friction = Frictional force

∴The minimum force needed to make the refrigerator to slid = 523.32 N

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.

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.