Five metal samples, with equal masses, are heated to 200 degrees celcius. each solid is dropped into a beaker containing 200 ml 15 degrees celcius water. which metal will raise the temperature of the water the most?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?