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!!!!
4 answers
0.60 * 3000 = ____
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.
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.
@Anonymous thx i got 100% ^^ <3
Anonymous is still right
9 answers