The Laws of Thermodynamics Quizizz

What is the efficiency of the machine if the input is 263 J and a the useful output is 142 J?

• 6.26%

• 54%

• 100%

• 260%

What is the work output of a machine that has a work input of 2,800 Joules and an efficiency of 92.3%? 

• 2,690J
• 92.3J
• 0.0082J
• 2,584.4

Tags

NGSS.HS-PS3-1

Work output of a large machine in a factory is 89,000 Joules, and its input is 102,000 joules. Work output of a similar machine is 92,000 joules, and its work input is 104,000 joules. Which machine has greater efficiency?

• The first machine

• The second machine

• Both have the same efficiency

• Not enough information provided

Lucas has been challenged to increase the efficiency of a device he is redesigning. His goal is 90% efficiency. The work input of the device is fixed at 10 joules, so Lucas is trying to improve work output. How many joules of work output should Lucas aim for to attain his goal of 90% efficiency?

• 9 Joules
• 900 Joules
• 0.9 Joules
• 25 

Tags

NGSS.MS-PS3-5

Ratio of work out to work in

• Efficiency

• Law of Conservation of Energy

• Transformation

• Lumens

The unit of work was named after...

• James Watt
• Isaac Newton
• James Joule
• Renee Descartes

Efficiency is a ______ of what you put in versus what you get out of a system.

• source
• ratio
• multiplication
• addition

A steam engine takes in 2.254 x 10⁴ kJ from the boiler and gives up 1.915 x 10⁴ kJ in exhaust during one cycle, what is the engine’s efficiency?

• 0.85

• 0.15

• 0.34

• 1.06

A steam engine absorbs 1.98 x 10⁵ J and expels 1.49 x 10⁵ J in each cycle. Assume that all of the remaining energy is used to do work. What is the engine's efficiency?

• 0.75

• 0.49

• 0.25

• 0.10

A steam engine absorbs 1.98 x 10⁵ J and expels 1.49 x 10⁵ J in each cycle. Assume that all of the remaining energy is used to do work. How much work is done in each cycle?

• 3.50 x 10⁵ J

• 1.98 x 10⁵ J

• 1.49 x 10⁵ J

• 4.9 x 10⁴ J