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solmaris [256]
3 years ago
11

Which of the following pulley systems have/has a greater mechanical advantage than the one shown above?

Physics
2 answers:
astraxan [27]3 years ago
8 0
Is there a picture or description?

lbvjy [14]3 years ago
6 0

A man uses a single movable pulley to lift a heavy load with a frictionless rope.

Which of the following pulley systems have/has a greater mechanical advantage than the one shown above?

W.

X.

Y.

Z.

Pulleys at the top of the rope are fixed.

A.

Z only

B.

W and Y

C.

W only

D.

W and X

Answer-

W only

Explanation-

Fixed pulleys do not change the mechanical advantage of a system. Movable pulleys that increase the number of sections of rope that bear the weight of the load increase the mechanical advantage of the system. The top image has one movable pulley. Only system W has more than one movable pulley—it has two.

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Explanation:

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ruslelena [56]
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3 0
3 years ago
Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, t
kkurt [141]

Answer:

t=0.038s

Explanation:

Project mass m=3.8 kg

Initial speed vi= 0m/s

Final speed vf= 9.3×10³ m/s

Force F=9.3×10⁵N

To find

Time t

Solution

From Newtons second law we know that

∑F=ma

Where m is mass

a is acceleration

We can write this equation as

∑F=m(Δv/Δt)

=m\frac{v_{f}-v_{i}}{t}

Rearrange this equation to find time t

So

t=m\frac{v_{f}-v_{i}}{F}

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