Read about Manny’s investigation then answer the questions. 1. What is a benefit of Manny’s electromagnet?
2. What are two things Manny could do to increase the strength of the electromagnetic force?
3. Look at the picture closely. What evidence is there that the electromagnet exerts a force on the
paper clips, even though they are not touching?
4. Many detaches the two wires from the battery and reattaches them to the opposite terminals.
Explain how this changes the current and magnetic field.
5. Suppose you pull the paperclips away from the nail. Explain how the potential energy between
the paperclips and the nail changes.

The gravitational force between two objects is 1600 and what will be the gravitational force between the objects if the distance between them doubles?

In a wind tunnel the speed changes as the cross sectional area of the tunnel changes. if the speed in a 6' x 6' square test section is 100 mph, what was the speed upstream of the test section where the tunnel measured 20' x 20'? use conservation of mass and assume incompressible flow. conservation of mass requires that as the flow moves through a path or a duct the product of the density, velocity and cross sectional area must remain constant; i.e., that ova-constant. a model is being tested in a wind tunnel at a speed of 100 mph if the flow in the test section is at sea level standard conditions, what is the pressure at the model's stagnation point? (a) the tunnel speed is being measured by a pitot-static tube connected to a u- tube manometer. what is the reading on that manometer in inches of water? (b) at one point on the model a pressure of 2058 psf is measured. what is the local airspeed at that point?

What is the momentum of a 2 kg object moving at 15 meters per second