An electron starts from rest 5.50 cm from the center of a uniformly charged insulating sphere of radius 2.90 cm. If the sphere carries a total charge of how fast will the electron be moving when it reaches the surface of the sphere? Note: Assume a reference level of potential V = 0 at r= infinity

How far will a stone travel over level ground if it is thrown upward at an angle of 30 degrees with respect to the horizontal and with a speed of 30 m/s? What is the maximum range that can be achieved if a stone is thrown with an initial speed of 24 m/s?

What is the average speed, if a person drives for 30.0 min at 80.0 km/h, 12.0 min at 100 km/h, and 45.0 min at 40.0 km.h and spends 15.0 min eating lunch and buying gas? The back of my textbook states that the answer is 52.9, but I don't know how to solve it!!

An amateur ball player runs at an average speed of 6.0 m/s between home plate and first base and 9.0 m/s between first and second. If the distance between the bases is 27.4 m and the base lines form an angle of 90 degrees, calculate his average velocity. Ans: 5.1 m/s A diver on a...

A boy is sitting in his tree house and observes a falling walnut passing from the top to the bottom of his window. The window is 2.5 m tall and it takes 0.43 s for the walnut to pass the window. How far is tehtop of the window from the squirrel above it that dropped the window? Ignore air...