Answer to question#7 is A, Explanation: The man in B is pulling 25 lbs of weight due to more mechanical advantage while the man in A is pulling 50 lbs of weight with less mechanical advantage. So, Man A is pulling harder.

Very nice and clear explanation...thank you very much

Helpful thank you

I have to admit I disagree with a couple of the answers here. For instance I believe the answer to question 9 is B. In B, the man's wall mounted pulley only changes the direction of his pulling. It could just as well be removed and have him pulling towards the wall instead of away. His force will be transmitted and pull on the cart pulley and also pull on the wall anchor (which also pulls on the cart pulley), meaning this system will double the man's strength. In example A, he's pulling on the cart pulley towards the wall, then the force is transmitted through the pulley on the wall to pull on the cart again and also transmitted through the pulley on the cart to pull on the wall tether, which also pulls on the cart. This system will triple the man's strength, meaning he has to work harder on system B (which only doubles his strength). Again you can check this. Define the rope (from his hands' position to the tether) as 3 units long, and start the cart 1.5 units from the wall. In example A start the man by the cart and have him pull towards the wall, walking 1.5 units. There will now be 3 equal segments of rope 1 unit long which means the cart will move 0.5 units towards the wall when the man walks 1.5 units, meaning the distance is 1/3 and the force must be tripled. In B if you have the man start by the wall and pull towards the cart, by the time you have 3 equal length 1 unit segments of rope, the man will have only walked 1 unit away from the wall and the cart will have come to meet him by moving 0.5 units towards the wall. The distance the cart moves is 1/2 the man thus his force has only doubled. I will admit I needed longer than 15 seconds to work this out. The answer to question 10 is indeed B, but it isn't to do with the length of a moment arm. It is to do with how parallel the pulling force is with the ground. The effective pulling force will be multiplied by the cosine of the angle to the ground. Whilst the lifting effect will reduce the rolling resistance slightly, this is negligible compared to the horizontal component reduction in the force. With the longer rope, a greater proportion of his force is in the horizontal component.

Good stuff thank you brother

I went to school for this stuff. For the first question, I picked C because I couldn't see that it was a lever. It just looked like a notch on the wood to me. So don't feel bad.

Question 8 is C. Same amount of reinforcement just a different design.

According to your explanation bridge A has a lot of steel in the middle of the span but in picture it shows B has a lot of steel in the middle of the span. It this case B is weaker than A.

nice

Cheers Hamza 👍

What book did you get these from? Can I have a copy please?

V thanks

I’m confused on 10, because it looks like the person is pushing the cart not pulling it.

9 B

what's the song playlist?

9. is B

Where can I find a copy of this specific exam?

Can someone explain to me the last one (I'm a non mechanical mind; I got it right but the explanation doesn't have enough explanation to it for me, probably because I've never had mechanical classes). What is "long moment arm" and how does it "reduce force?"

Question 6 his answer will be "B"

If someone could please tell me where these questions are from !!? Is it from a booklet ?

A

B

Woah woah woah. I know for a fact with the image those light bulbs are not DC but AC and that battery is DC not AC. That will not work, only DC electricity and DC components work together.

Q 7 is A

Wheres 7th explanation?

Great!!! But many spelling errors, like "alot" and "havier".

4:05 whats the name of that instrumental sound?

what was the answer for #7?

source : trust me bro

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Answer to 9 is wrong. It should be B. Mechanical advantage for A is 3 and for B is 2.

instead of music voice explanation would be better. It annoying to pause a video and read .

Why didn’t you answer the pulley one you skipped over it?

B

A

B

B

A

A

A