A 0.5-kg ball with a total mechanical energy of 250 J is rolling down a hill. Using the law of conservation of energy, complete the following chart by calculating the missing variables. AI A Aa X2 Ω All x? 6 B Potential Energy (J) Kinetic Energy (J) Velocity (m/s) 250 0 125 125 9.75 31 31.6 250

Note: the following questions are unrelated to the balmer series or the martian. refer to your course notes. a sun-sized star will spend most of its lifetime as a: white dwarf b. red giant c. protostar d. main-sequence star

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? yourunits 3. a clothes dryer uses about 2 amps of current from a 240 volt line. how much power does it use? yourunits 4.

An electron is traveling with initial kinetic energy k in a uniform electric field. the electron comes to rest momentarily after traveling a distance d. (a) what is the magnitude of the electric field