A girl on a skateboard (total mass of 40 kg) is moving at a speed of 10 m/s at the bottom of a long road. The road is inclined at 20o with respect to the horizontal. If she travels 14.2 m upward along the road before stopping, without pushing in any way, what is the net frictional force on her?

Sara is creating an experiment. her hypothesis states the following. if i increase the air in my tires, then i will get better gas mileage. if this is her hypothesis what column titles do we need in our date table? a. air pressure in tire (psi) and gas mileage (mph) b. air pressure in the atmosphere (psi) and gas mileage (mph) c. miles (m) and gallons per mile (g) d. old battery and new battery

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?

Which transition by an electron will release the greatest amount of energy? oa ob oc od