Zoe rode her skateboard down a hill with an acceleration of 6 m/s such as she started at the top of the hill with a velocity of 2 m/s by the time she passed the oak tree at the bottom of the hill she was going 44 m/s how long did it take for Zoe to reach the bottom of the hill (in seconds)? T =

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.