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olya-2409 [2.1K]
2 years ago
10

A doorknob makes it easier for you to open doors because it is what type of simple machine?

Chemistry
1 answer:
vagabundo [1.1K]2 years ago
5 0

Answer: Wheel and Axle

Both of these work together to form a simple machine. You can't have one without the other.

If you try to turn just the axle itself, then you'll find it takes a lot of work. This is because the inertia of the axle wants to keep the object at rest. Also, you won't have a lot of torque due to the small radius compared to what a doorknob can offer.

Using a doorknob is like putting a (steering) wheel on an axle. This increases the radius and therefore increases the torque. You put in less work into the system and get more out of it.

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In the activity series, any metal on the list can be oxidized by the ions of elements_______it.
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Answer:

Below

Nitric acid

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Sodium nitrate

Explanation:

The activity series is an arrangement of metals in order of decreasing reactivity. Metals that are higher up in the series displace metals that are lower in the series from dilute solutions. Hence, when the ion of a metal that is lower in the series reacts with a metal that is higher up in the series, the latter is oxidized.

Dilute acids dissolve metals above hydrogen in the activity series such as as zinc and lead. Platinum is much lower than sodium in the activity series hence platinum does not react with sodium nitrate.

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2 years ago
How do catalysts increase the rate of a chemical reaction?
kramer
<span>They lower the activation energy.</span>
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ra1l [238]
The maximum the fourth shell can have is 32.
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3. Two people are playing tug of war. One person pulls to the right with 32 N of force. The other person pulls to the left with
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The net force = -5 N

The direction : to the left(negative sign)

<h3>Further explanation </h3>

Net force : the sum of all forces acting on an object

Force is a vector quantity that has both magnitude and direction,

We agree that the move up and to the right is a positive sign, while down and to the left is a negative sign.

The direction of the force (horizontal motion) is to the right (+32 N), and to the left (-37 N), so the net force :

\tt \sum F=F~right-F~left\\\\\sum F=32-37\\\\\sum F=-5~N

5 0
2 years ago
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