Suppose you stand on the rim of a space station. If the radius of the station is 12,000 meters, at what tangential speed must the rim of the station move in order for you to have the same weight as on the Earth?

[HINT: F=mv2/r = mg]

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.

Which of the following statement is false

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?