A girl throws a pebble into a deep well at 4.0 m/s (downward). It hits the water in 2.0 s.
a. How far below the ground is the water's surface?
b. What is the pebble's average velocity?

Alexander calder's mobiles are an example of motion because it uses forces of wind and water.

Asystem containing an ideal gas at a constant pressure of 1.22×10^5 pa gains 2140 j of heat. during the process, the internal energy of the system increases by 2320 j. what is the change in volume of the gas?

Two technicians are discussing a resistance measurement between the can-h and can-l wires. technician a says this measurement should be done with the ignition switch in the "run" position. technician b states that a measurement of 0 ohms indicates an open in the network. which technician is correct?