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salantis [7]
3 years ago
10

What effect does a catalyst have on the energy of a reaction system? HELP ASAP PLZ!!

Physics
1 answer:
Lubov Fominskaja [6]3 years ago
5 0

Answer:

I think option A is correct

=> it increases the initial energy of the reactants

hope it helps

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A food packet is dropped from a helicopter during a flood-relief operation from a height of 750 meters. Assuming no drag (air fr
Leviafan [203]

1. Velocity at which the packet reaches the ground: 121.2 m/s

The motion of the packet is a uniformly accelerated motion, with constant acceleration a=g=9.8 m/s^2 directed downward, initial vertical position d=750 m, and initial vertical velocity v_0 = 0. We can use the following SUVAT equation to find the final velocity of the packet after travelling for d=750 m:

v_f^2 -v_i^2 =2ad

substituting, we find

v_f^2 = 2ad\\v_f = \sqrt{2ad}=\sqrt{2(9.8 m/s^2)(750 m)}=121.2 m/s

2. height at which the packet has half this velocity: 562.6 m

We need to find the heigth at which the packet has a velocity of

v_f=\frac{121.2 m/s}{2}=60.6 m/s

In order to do that, we use again the same SUVAT equation substituting v_f with this value, so that we find the new distance d that the packet travelled from the helicopter to reach this velocity:

v_f^2-v_i^2=2ad\\d=\frac{v_f^2}{2a}=\frac{(60.6 m/s)^2}{2(9.8 m/s^2)}=187.4 m

Which means that the heigth of the packet was

h=750 m-187.4 m=562.6 m

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3 years ago
O How are electricity and magnetism related?
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A box with a mass of 7 kilograms is pushed up a ramp to a height of 5 meters. What is the work done against the force of gravity
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The potential energy of the box when it gets to the top is

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That's the work done against the force of gravity.  Any
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It is an example of balanced force.


hope this helps. good luck 
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3 years ago
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The distance between two electric pole is 800m then express this in terms of mm​
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Answer:

Mm stands for milimetres

Explanation:

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