Science

Ms. Sue please help.
8. Which would best reduce the amount of energy needed to pull a wagon up a ramp? (1 point)
increasing the slope of the ramp
reducing the friction between the wagon wheels
reducing the length of the wagon handle
increasing the friction between the wagon wheels
9. To lift a load to the roof, you apply 21 N of force to a pulley. The pulley applies 21 N of force to the load. What is the mechanical advantage of the pulley? (1 point)
0
1
40
21
10. Carla applied a force of 35 N to a wheelbarrow full of bricks and moved it 2.5 m. Which of the following can be determined from this information? (1 point)
The wheelbarrow supplied 87.5 J of work.
The wheelbarrow has a mechanical advantage of 14.
The wheelbarrow is 7 percent efficient.
The wheelbarrow has 87.5 J of potential energy.

my answers
8.b
9.c
10.a

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asked by Austin
  1. 8.b yes
    9.c Huh? 21/21 = 1
    10.a I do not think so. She, not the wheelbarrow, supplied the work.
    If it weighed 35 N and she lifted it 2.5 meters, then D would be correct.
    The problem is poorly written. It is not clear if the force is in the direction of motion.

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    posted by Damon
  2. CA Unit 2 Lesson 4
    Gravitational Potential Energy
    1)B
    2)A
    3)D
    4)B
    5)C
    6)A
    7)D
    8)B
    9)B
    10)A

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  3. 8.B
    9.C

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    posted by kc
  4. Are they right?

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  5. No they are wrong only 8/10 :(

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    posted by Jackson
  6. B
    A
    D
    B
    C
    A
    D
    B
    B
    A

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    posted by Taylor
  7. Do you have the right answers?

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  8. Taylor and anon are correct

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    posted by Racen
  9. oh ok I will try them

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  10. ok

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  11. Is it for unit 2 or 3?

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  12. They are correct and it is for unit 3. For 8th grade science.

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  13. THANK YOU SO MUCH! TAYLOR IS CORRECT YES FINALLY SO SO GREATFUL!!!!!!!!!! :D

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  14. Taylor is 100% correct. Just be sure to answer with all her answers correctly!!

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  15. Does this work for 6th grade science as well because the questions are the same

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    posted by Mia
  16. Thank you so much Taylor is a 100% correct

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    posted by 8845637
  17. So is Taylor correct with her answers? It’s only 1-10. It’s the same for me but 1-11 for 6th grade science same questions pls help

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    posted by Gal42

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