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Sergio039 [100]
3 years ago
11

Why do scientists believe the universe is still expanding?

Physics
1 answer:
strojnjashka [21]3 years ago
5 0
I don’t understand the question
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What do wind energy, hydro-energy, and fossil fuel energy have in common?
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Answer:

Fossil fuels store energy from the sun as

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A light spring obeys Hooke's law. The spring's unstretched length is 33.5 cm. One end of the spring is attached to the top of a
ZanzabumX [31]

Answer:

807.88N/m

Explanation:

<em>The  question has some missing details in it, nevertheless, based on the given data we want to find the spring constant K</em>

Step one

given data

Unstretched length = 33.5 cm

Final length of the spring = 42.0 cm

Δx= 42-33.5

Δx=8.5cm to m= 0.085m

mass m= 7kg

The force on the spring

F=mg

F= 7*9.81

F=68.67N

Step two:

From Hooke's law, we can make k subject of formula and find the spring constant k, we have

F=kΔx---------1

make k subject of the formula

k=F/Δx

k= 68.67/ 0.085

k=807.88N/m

4 0
3 years ago
Help help help help help
Dima020 [189]
743 divides by djhd fjhfjfjsa 3883
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A forward honzontal force of 50 N is applied to a crate. A second horizontal force o
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Explanation:

magnitude: 180-50=130N

Direction: in the direction same as the second horizontal force

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A 16 kg block is dragged over a rough, hor-
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So what's the question here?

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