If a helicopter's mass if 4500kg and the net force onit is 18000 N upward what is its acceleration?

a = - 5.81 [m/s^2]

Explanation:

Using newton's second law, which tells us that the sum of forces is equal to the product of mass by acceleration, we can find acceleration. The forces acting are the weight of the helicopter and the lifting force.

W - Lf = m *a

W = weight of the helicopter [N]

Lf = lifting force = [N]

m = mass of the helicopter [kg]

a = acceleration [m/s^2]

- (4500*9.81) + 18000 = 4500 *a

a = - 5.81 [m/s^2]

The negative sign tells us that the helicopter is slowing down.

a) cold, dry

explanation:

continental polar masses are cold and dry air masses because the cold air cannot hold much moisture. as they move into warmer air, they can trigger precipitation.

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.