Get an answer in 5 minutes

Ask a question to our educators
SCIENCE

# A diesel engine uses 6000J of chemical energy and does 2100J of work?

Useful energy out divide by total energy in x 100 So 2100 divided by 6000 = 0.35 0.35 x 100 = 35%

Yasmeen Begum
·

3.6k students helped

If you wanted to work out the efficiency of the engine you would use Efficiency = (Useful energy output/total energy input)×100. In this case, the useful energy is 2100J since an engine is designed to do work. The total input comes from the chemical energy store of the fuel which is 6000J. The remaining 3900J is wasted as heat, sound etc. So plugging in the values we get E=(2100/6000)×100 E=35%

Awais Naveed
·

7.4k students helped

## What is Q&A on Scoodle?

At Scoodle we understand that everyone learns in a different way. Some people learn through practice, using essays and notes; others prefer video lessons to watch and learn, some just need help with a specifically hard question, while some learn best 1-on-1 tutoring sessions. At Scoodle we cater for all types of learning styles and needs. From GCSE Maths video lessons to A-level English essays and specialist educators in every subject - we’ve got you covered.

Scoodle has helped over 131,000 students so far

Need help with Secondary Science?

Getting expert help from a tutor is a great way to improve your Science grades.

Learn with Video Lessons
1hr 9m · 7 videos
Ibrahim Dangra
·

1.4k students helped

A-Level Physical Chemistry
1hr 28m · 8 videos
Paja Kruzikova
·

650 students helped

GCSE Maths - Numbers
20m · 7 videos
Nina Modak
·

2k students helped

How to Analyse (Unseen) Poetry
30m · 5 videos
Jackie Jones
·

802 students helped

COVID-19 Guidance For Students
29m · 5 videos
Jackie Jones
·

802 students helped