Based on the law of conversation of energy how can we reasonably improve a machines ability to do work?

a. move the machine to a different gravitational field

b. increase the friction between it’s moving parts

c. reduce the friction between it’s moving parts

d. refine the machines system boundaries

Aplane takes off from an airport and flies to town a, located d1 = 215 km from the airport in the direction 20.0° north of east. the plane then flies to town b, located d2 = 230 km at 30.0° west of north from town a. use graphical methods to determine the distance and direction from town b to the airport. (enter the distance in km and the direction in degrees south of west.)

What is the measurement of how fast an object moves relative to a reference point?

A15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°c to 175°c. what is the specific heat capacity of iron?