Cassie pulled the boat onto the ice and adjusted its sails. Once she got started she would be able to steer, change direction and control her speed with a few twists of the ropes. Giving the boat a mighty heave across the ice, Cassie jumped in. What kind of energy will Cassie use to power the boat? Hydroelectric Solar Geothermal Wind

Iwill give 30 points to whoever answers ! what is the formula for actual mechanical advantage and ideal mechanical advantage?

A2000 kg car is rounding a curve of radius 200 m on a level road. the maximum frictional force the road can exert on the tires of the car is 4000 n. what is the highest speed at which the car can round the curve?

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.