A 4600 kg helicopter accelerates upward at 2.0 m/s². Determine the lift force exerted on the propellers by the air. Make a quantitative force diagram. Write a net force equation for the axis along which forces are not balanced.

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

What can you increase the strength of an electromagnet by

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.