A ferryboat on a river has a speed v relative to the water. The water of the the river flows with a speed V relative to the ground. The width of the river is d. (a) Show that the ferryboat takes a time 2d/p v2 − V 2 to travel across the river and back. (b) Show that the ferryboat takes a time 2dv/(v2 − V 2) to travel a distance d up the river and back. Which trip takes the shorter time?

How do the measurements of charge at the different locations on the sphere compare to each other? the charge measurements are different at all locations on the sphere. the charge measurements are virtually not the same at all locations on the sphere except for the charge at the very top and at the very bottom that are equal. the charge measurements are virtually the same at all locations on the sphere except for the charge at the very top. at the top, the conductive sphere has a small disk that is made of different material. the charge measurements are the same at all locations on the sphere. what happens to the charge on the conductive sphere when it is connected to a source of charge such as the electrostatic voltage source? nothing will happen because no charge goes around the surface of the sphere. the charge on the conductive sphere spreads out over the surface of the sphere; being greater in some specific locations on the sphere. the charge on the conductive sphere spreads out uniformly over the surface of the sphere. the charge on the conductive sphere spreads out non-uniformly over the surface of the sphere.

Time remainin52: 42the chart shows data for a moving object. which conclusion is best supported by the information inthe chart? time (s)velocity (m/s

Explain why electric current cannot exist if a current doesn't have a voltage source.