Answer:
True
Explanation:
If the object moves at constant speed then it means that the velocity changes instantaneously although the speed does not change. The change in velocity brings out acceleration and where there is a mass that undergoes acceleration there must be an external resultant force. this force is centripetal force.
Answer:
efficiency = useful energy out ÷ total energy in (for a decimal efficiency)
or.
efficiency = (useful energy out ÷ total energy in) × 100 (for a percentage efficiency)
Explanation:
Answer:
Explanation:
Isaac Newton argued that the geometric nature of reflection and refraction of light could only be explained if light were made of particles, referred to as corpuscles, because waves do not tend to travel in straight lines.
Answer:
The rate at which work is done is called <em>Powe</em><em>r</em><em>.</em>
<em>hop</em><em>e</em><em> it</em><em> helps</em><em>!</em>
It's <em>chemical energy</em>.
It started out as energy carried in solar radiation. It was absorbed by plants, and they stored it as chemical energy in their stems and leaves. The plants got cut down, washed off, and delivered to the supermarket. Your mom brought them home, camouflaged them so they wouldn't look like veggies, and put them on your plate while you weren't looking. Eventually, some of them got into your body, got digested, and their energy got stored in your cells as glucose and fat. When you needed some energy to do something physical or mental, you grabbed some of that energy that you had stored as chemical energy, and used it to operate your muscles and your brain. You used the glucose (blood sugar) first, and if you ever reached the point where that was running low, you started to use the fat that you have stored around in many places.