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?

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz. what wavelength is produced?

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.