Question

Efficiency of Machines Quick Check
Which car has the greatest efficiency? (1 point)
O a 1,200 kg car that travels 15 km per liter of fuel
• a 1,200 kg car that travels 20 km per liter of fuel
• a 900 kg car that travels 15 km per liter of fuel
• a 900 kg car that travels 20 km per liter

Answer 1

The greatest efficiency would be the car that can travel the farthest distance per liter of fuel. In this case, the 1,200 kg car that travels 20 km per liter of fuel has the highest efficiency.

Answer 2

Why are incandescent light bulbs considered to be lower efficiency than LED bulbs? (1 point)
A greater percentage of the energy output of the incandescent bulb goes toward heat.
A smaller amount of energy is wasted by the incandescent bulb.
A smaller percentage of the energy output of the LED bulb goes toward light.
A greater amount of energy is required for the same light output from the LED bulb

Answer 3

A greater percentage of the energy output of the incandescent bulb goes toward heat.