Which best describes how combustion works?
a)it breaks and forms bonds of fuel to release thermal energy.
b)it breaks and forms bonds of fuel to release chemical energy.
c) it breaks and forms bonds of coolant to release thermal energy.
d)it breaks and forms bonds of coolant to release chemical energy.

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles