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notsponge [240]
3 years ago
10

You and your friends are building a treehouse, and you need a machine to get a heavy load of wood from the ground to the top of

the tree. You set up a pulley system that allows you to pull down on the rope to lift the wood. What type of pulley system was this and how did it make work easier?
Question 9 options:


fixed pulley by changing the direction of input force.


movable pulley by decreasing input force but not the direction.
Chemistry
1 answer:
11111nata11111 [884]3 years ago
4 0

Machines are systems that are built to carry out a certain function or work. These are classified as: Simple and Compound Machines.

Simple machines are simple tools used to accomplish a certain task. These include lever, pulley, inclined plane atc. In contrast compound machines are a combination of simple machines.

In the given scenario, a pulley system was used to carry the wood from the bottom to the tree top. This is a movable pulley system which is directly attached to the load and works by decreasing the input force but not the direction.

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As the temperature increases, B) the molecules started moving faster.

Explanation:

The temperature of a substance is a measure of the average kinetic energy of the particles in a substance. In particular, it can be found that the temperature is directly proportional to the average kinetic energy of the particles:

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Therefore, if we apply this concept to this problem, we infer that as the temperature of the water in the pond gets higher, the speed of the molecules inside the water increases, which means that the molecules are moving faster.

Therefore, the correct answer is

B) the molecules started moving faster.

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What causes an increase in the reaction rate between molecules
Anestetic [448]
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Ne4ueva [31]

Answer : The total mass of carbon dioxide and water produced will be, 65.7 grams.

Explanation :

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The balanced chemical reaction will be,

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65.7 grams = Total mass of 6CO_2+6H_2O

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