Why are machines not a 100% efficient?

Why do black holes happen?

A classmate claims that using this food chain and assuming there is a 10% energy transfer rate, a snake would have to eat 10 frogs to get enough energy is this a correct understanding from your classmate?

You should expect each child's development to be A. full of ups and downs depending on their life outside of your setting. B. following a predictable path as defined in the Early Learning Outcomes Framework. C.

The weight of a body above the surface of the Earth is inversely proportional to the square of its distance from the center of the Earth. What is the effect on the weight when the distance is multiplied by 2 ? A. The weight is multiplied by 4. B.

Which of the following is not a type of mass movement that results from the force of gravity? A. Mudflow B. Deflation C. Landslide D. Creep

Why does a metal spoon left on a bowl of hot soup become warm? A) Metal is a conductor. B) Metal is an insulator. C) Metal produces its own heat. D) Metal heats up from magnetism.

What does the heat shock step of the transformation procedure accomplish?

An olympic hurdler accelerates at a rate of 15.5 m/s2. what is the rate in miles/min2?

What is the conservation of energy?

What data are needed to calculate the actual mechanical advantage of a machine