Aroller coaster (378 kg) moves from a (3.24 m above the ground) to b (28.3 m above the ground). two non-conservative forces are present: friction does -2.84 x 104 j of work on the car, and a chain mechanism does +5.24 x 104 j of work to the car up a long climb. what is the change in the car's kinetic energy kef - keo from a to b?

If the wheels lock when braking suddenly the vehicle: a: loses traction b: lose steering wheel ability c: gain speed slightly d: gain steering ability

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.

What was the first instrument to ever record an earthquake?