If energy is always conserved, how can some devices be more efficient then others?

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genius_generous answered 1 year ago

In nature, is total energy always conserved (yes or no)? Why?

In nature, is mechanical energy always conserved (yes or no) why?

How can angular momentum be conserved, but evergy not be conserved?

1a: We eat food to gain energy. Some foods provide energy more efficiently than others. The...

1a: We eat food to gain energy. Some foods provide energy more efficiently than others. The established energy value for three food types is given: carbohydrates, 17 kJ/g; fats, 38 kJ/g; and proteins, 17kJ/g. Look at the nutrition label on your favorite candy bar. Calculate the energy gained by eating this candy. 1b: If the same amount of heat is added to equal masses of aluminum, lead, zinc, and iron, which metal would experience the greatest increase in temperature? Explain.

Suppose the total mechanical energy of an object is conserved. Which one or more of the...

Suppose the total mechanical energy of an object is conserved. Which one or more of the following statements is/are true? A) If the kinetic energy decreases, the gravitational potential energy increases B) If the gravitational potential energy decreases, the kinetic energy increases C) If the kinetic energy does not change, the gravitational potential energy also does not change D) All of the above E) None of the above

How was life difficult for the colonists? Was it easier for some, more than others? What...

How was life difficult for the colonists? Was it easier for some, more than others? What accounts for the many differences?

In an energy efficient world riding bicycles is becoming more and more popular, resulting in a...

In an energy efficient world riding bicycles is becoming more and more popular, resulting in a large number of customers. However, customers are generally indifferent between brands and believe that all bicycles are the same - making the market perfectly competitive. Unfortunately, making bicycle frames requires special skills so the supply of workers in this industry is upward-sloping, and the wages earned by frame makers increase as the industry output increases. Firms in this market face the following total cost:...

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If energy is always conserved, how can some devices be more efficient then others?

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