A student is a toy car from a bench and places the toy car at the top of a slope as shown in Figure 1. toy car

bench

Figure Desobe an energy transfer that occurs when the student lifts the loy car from 1

the bed and places the toy car at the top of the slope

This is what a calorimeter is used for simpler ex, to measure calories in food.

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

Ithink it's  c. i'm sure 

Can give more details