Question

A machine’s efficiency is determined to be 60%. The input work is 3,000 joules. What is the output work?

A) 180,000 joules
B) 50 joules
C) 1,800 joules
D) 5,000 joules
Plz Helpppp!!!!

Answer 1

0.60 * 3000 = ____

Answer 2

Q1. A machine’s efficiency is determined to be 60%. The input work is 3,000 joules. What is the output work?

A1. 1,800 joules

Q. A gardener uses a wheelbarrow as a lever to lift some dirt. The energy applied by the gardener is 2,000 joules. The efficiency of the work done is 95%. How much work is done on the dirt?

A2. 1,900 joules

Q3. A pulley system is operating at only 50% efficiency. How could the efficiency be increased?

A3. by reducing the friction on the pulleys

Q4. What is the name of the fixed point about which a lever rotates?

A4. fulcrum

Q5. Which car has the greatest efficiency?

A5. a 1,200 kg car that travels 20 km per liter of fuel

I just took the Efficiency of Machines Quick Check for Unit 2 Lesson 5 of my Science class, and these are 100% correct, I promise.

Answer 3

@Anonymous thx i got 100% ^^ <3

Answer 4

Anonymous is still right