Below is a picture of a man pushing a wheelbarrow. Which of the following options correctly labels the Effort (E), Load (L), and Fulcrum (F)?
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1 point
Captionless Image
The Man = F. The Basket of the Wheelbarrow = L. The Wheel = E.
The Man = F. The Basket of the Wheelbarrow =E. The Wheel = L.
The Man = E. The Basket of the Wheelbarrow = L. The Wheel = F.
The Man = L. The Basket of the Wheelbarrow = F. The Wheel = E.
The Man = E. The Basket of the Wheelbarrow = L. The Wheel = F.
Use the formula below to answer the following question.
Which of the following vehicles is most efficient?
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1 point
Captionless Image
A vehicle that travels 85km on 15 liters of fuel.
A vehicle that travels 66km on 11 liters of fuel.
A vehicle that travels 96km on 32 liters of fuel.
A vehicle that travels 48km on 6 liters of fuel.
To determine which vehicle is the most efficient, we can use the formula Efficiency = Distance / Fuel Consumption.
1. Vehicle 1: Efficiency = 85 km / 15 liters = 5.67 km/l
2. Vehicle 2: Efficiency = 66 km / 11 liters = 6 km/l
3. Vehicle 3: Efficiency = 96 km / 32 liters = 3 km/l
4. Vehicle 4: Efficiency = 48 km / 6 liters = 8 km/l
Therefore, the most efficient vehicle is the one that travels 48km on 6 liters of fuel, having an efficiency of 8 km/l.
what is the answer
The most efficient vehicle is the one that travels 48km on 6 liters of fuel, with an efficiency of 8 km/l.
Which of the following is an example of a lever?
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1 point
Doorstop
Screwdriver
FlagPole
Dumbbells
Doorstop
Use the image below to answer the question.
The graph below shows the efficiency of three pulleys used at a construction site to lift large loads around the site. Compare pulleys A, B, and C. Which pulley has the HIGHEST mechanical advantage? HINT, use your knowledge of efficiency.
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1 point
Captionless Image
Pulley A.
Pulley B.
Pulley C.
Pulleys A, B, and C have the same mechanical advantage.
The mechanical advantage is highest when efficiency is highest. Therefore, the pulley with the highest mechanical advantage would be the one that has the highest efficiency. From the graph, it seems like Pulley A has the highest efficiency, so Pulley A would have the highest mechanical advantage. Therefore, the answer is Pulley A.
Use the information below to answer the question.
Part A: What is the efficiency of a simple machine if it puts out 400J of energy for every 1320J done on the machine? Leave your answer as a percentage and round to the nearest tenth.
Efficiency=(Output Work/Input Work) x 100%
Part B: Choose ONE of the simple machines listed below and tell me in 1-2 sentences how you would improve the efficiency of that machine? You should include the answer from Part A in your response here because the efficiency in Part A is the efficiency of the machine you picked. You don't need to tell me about all of them; choose the one that your are most knowledgeable about.
Choose one of:
1. Pulley
2. Inclined Plane
3. Lever
To receive full credit for this item, your response must:
Correctly calculate the efficiency of a simple machine and leave your answer as a percentage rounded to the nearest tenth. You will lose a point if the answer is not written as a percentage rounded to the nearest tenth (2pts.)
Correctly describe how you would improve the efficiency of one of the machines listed in Part B. You will lose a point if the answer if you don't include your answer from Part A. The efficiency in Part A is the efficiency of the machine you chose for Part B (2pts.)