A 1.5kg ball swings at the end of a string in a horizontal circle at a constant speed of 5m/s. a) If the string is 0.5m long, how much time does it take for the ball to go around once?

b) What is the force of tension pulling the ball towards the center?

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Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

A2.0 μf capacitor and a 4.0 μf capacitor are connected in series across a 0.827-kv potential. the charged capacitors are then disconnected from the source and connected to each other with terminals of like sign together. find the voltage across each capacitor.

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?