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Amanda [17]
3 years ago
9

What is the mechanical advantage of a pulley?

Physics
2 answers:
STatiana [176]3 years ago
3 0
<span>the mechanical advantage of a pulley is 1.0

</span>
Ann [662]3 years ago
3 0

Answer:

Mechanical advantage is the ratio of the load and effort.

Mechanical advantage of a pulley is 1.

Explanation:  

A pulley system will help in reducing the effort when lifting a load. If more pulleys are used, less effort force is required, making the lifting easy.

When only one pulley is used to lift a load, the mechanical advantage is 1.

If the number of pulleys used are increased, less effort can be applied, as the mechanical advantage increases.

The mechanical advantage is equal to the number of ropes passing over the pulley or pulleys to which the load is attached.

The rope along which the effort is applied is not counted.

 

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What is the transfer of heat by the flow of a heated material?
dolphi86 [110]
Heat<span> flux is a quantitative, vectorial representation of </span>heat-flow<span> through a surface. ...</span>Heat transfer<span> is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and </span>transfer<span> of energy by phase changes.</span>
7 0
3 years ago
Which of the following is not true of a conductor? A. It is used in electrical circuits. B. It allows easy passage of moving cha
Oksi-84 [34.3K]
Three of the statements are true.  'D' is false.
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8 0
3 years ago
Read 2 more answers
A block whose weight is 45 N rests on a horizontal table. A horizontal force of 36 N is applied to the block. The coefficient of
riadik2000 [5.3K]

Answer:

1.5 m/s²

Explanation:

For the block to move, it must first overcome the static friction.

Fs = N μs

Fs = (45 N) (0.42)

Fs = 18.9 N

This is less than the 36 N applied, so the block will move.  Since the block is moving, kinetic friction takes over.  To find the block's acceleration, use Newton's second law:

∑F = ma

F − N μk = ma

36 N − (45 N) (0.65) = (45 N / 9.8 m/s²) a

6.75 N = 4.59 kg a

a = 1.47 m/s²

Rounded to two significant figures, the block's acceleration is 1.5 m/s².

Usually the coefficient of static friction is greater than the coefficient of kinetic friction.  You might want to double check the problem statement, just to be sure.

6 0
3 years ago
B. Interpret Data Solution A has a pH of 1.6.
Kobotan [32]

Answer:

Solution A has a pH of 6 and solution B has a pH of 8. Which of the following is true regarding the concentration of hydrogen ions in each solution? A) A has 100 times greater H+ concentration than B. B) B has 100 times greater H+ concentration than A. C) A has 7/9 of the H+ concentration of B. D) A has 9/7 of the H+ concentration of B. E) none of these

Explanation:

Hey im super sorry if i get this wrong :)

6 0
2 years ago
A projectile is launched at an angle above the
gtnhenbr [62]
The first rule of vectors is that the horizontal and vertical components are separate. Disregarding air resistance, the only thing we have to worry about is gravity.

The appropriate suvat to use for the vertical component is v = u +at
I will take a to be -9.81, you may have to change it to be 10 if your qualification likes g to be 10.

v = 30 + (-9.81x2)
v = 30 - 19.62
=10.38m/s

Therefore we know that after 2.0 s the vertical component will be 10.38ms^-1, ie 10m/s as the answers given are all to 2sf.

The horizontal component is completely separate to the vertical component and since there is no air resistance, it will remain constant throughout the projectiles trajectory. Therefore it will remain at 40ms^-1.

Combining this together we get:
(1) vx=40m/s and vy=10m/s

7 0
2 years ago
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