- B3.3 Useful Energy and Efficiency pages 215-220 Useful Energy The purpose of a machine is to convert the initial energy input to the type of desired energy output. Energy input refers to the __ Useful energy output refers to the __ . All energy output that is not being used to do useful work is considered __ (e.g. energy lost due to friction). State the input energy.useful output energy, and waste energy in the following situations: 1. Light bulb 2. Truck 3. Human Body __ - Percent efficiency is calculated using the following formula:
- In liquids, convection currents move up at the heat source, down toward the cool liquid down at the heat source, up toward the cool liquid up at the heat source, up toward the cool liquid down at the heat source, down toward the cool liquid
- Problem How much work and power do you put into getting up a flight of stairs? Background Information __ Work equals force times the distance through which the force acts.Force is expressed in Newtons (N) and distance is expressed in meters (m). Work is expressed in newton meters, or the simplification, joules (J). The rate at which work is done is called power. Power equals work divided by time. If work is in joules (J)and time is in seconds (s), power is expressed in joules/second, or the simplification watt (w)James Watt was a British scientist who invented the steam engine. To find out how the power of his engine compared to that of a horse, Watt measured how fast an average horse could do work.He found the answer and expressed the amount of work performed per second as a horsepower. One horsepower is the equivalent of 746 w. Pre-Lab Questions - Answer in complete sentences or no credit. 1.What is the difference between mass and weight? 2. What is work?Include the formula and units. 3.What is power?Include the formula and units. 4.What is the difference between work and power?
- 24/30 ¿Qué sucede cuando una masa de aire caliente se encuentra con una masa de aire frío? El aire frío se eleva sobre el aire caliente, formando un frente ocluido. Las dos masas de aire se mezclan sin formar un frente. Se forma un frente cálido y el aire caliente se eleva sobre el aire frío. El aire caliente se enfría rápidamente, formando un frente frío.
- If you hold your hand off to the side of the pot with the boiling water, your hand will start to feel warm. Which type of heat transfer is demonstrated in this situation? Radiation Density Convection Conduction
