Mercury has a mass of 3.30×1023 kg and a radius of 2.44×106 m. Find Mercury’s gravitational field strength.
Show your work (formula, substitution, and answer (rounded correctly and with the appropriate unit)) .

A small Styrofoam ball has a 2.26 nC charge (2.26×10-9 C). Find the electric field strength 5.00 cm (0.0500 m) from the ball.
Show your work (formula, substitution, and answer (rounded correctly and with the appropriate unit)) .

A 12 V battery is connected to a resistor, a light bulb, and a buzzer. What are the energy exchanges that occur in the circuit?

A desk top computer plugs into the wall socket at 120V and draws an average current of 2.10 A. How much energy (in kWh) does the computer use each day assuming that it is never turned off?
Show your work, including formulae and substitutions and express your answer rounded correctly and with the appropriate units.