Sample Question: A cheetah travels 20 km west in an hour. The cheetah stops for another hour. Then, the cheetah travels another 40 km west in two hours. What is the velocity of the cheetah? Use the sample question to answer the following: What is the velocity of the cheetah? Show your work.​

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 

It really doesn't matter for any of the questions that you've listed.

The sunlight shines uv radiation on earth,a microwave oven radiates waves on food