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3 years ago

5. Did objects have to touch to interact? What causes this?

Physics

2 answers:

dimulka [17.4K]3 years ago

6 0

Answer:

★ For example, a useful analogy for explaining the Earth's gravity force is that the Earth can pull on objects without touching them just like a magnet can affect other objects without touching them. In Addition, the main notion to convey here is that forces can act at a distance with no perceivable substance in between.

Explanation:

Hope you have a great day :)

djverab [1.8K]3 years ago

5 0

Answer/Explanation

A useful analogy for explaining the Earth's gravity force is that the Earth can pull on objects without touching them just like a magnet can affect other objects without touching them. The main notion to convey here is that forces can act at a distance with no perceivable substance in between.

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A scientific study is repeated by four different groups. Only two groups get the same results. Are the data reproducible?

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No, one more group must get the same result as the other group. This will make it more reliable and reproducible.

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3 years ago

The electron has the positron as its antiparticle.<br><br> A True<br> B False

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The answer would be true

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a load of 45 N attached to a spring that is hanging vertically stretches the spring 0.14 m. What is the spring constant?

zhenek [66]

According to Hooke's law, Force = spring constant x displacement of the spring. Spring constant = Force/displacement in spring = 45/0.14 = 321.42 N/m. Hope this helps!

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3 years ago

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A hot rod can accelerate from 0 to 60 km/h in 5.4 s.

mylen [45]

Answer:

<h2>a) Acceleration is 3.09 m/s²</h2><h2>b) Distance traveled is 45.05 m</h2><h2>c) Time taken to travel 250 m is 12.72 s</h2>

Explanation:

a) We have equation of motion v = u + at

Initial velocity, u = 0 km/hr = 0 m/s

Final velocity, v = 60 km/hr = 16.67 m/s

Time, t = 5.4 s

Substituting

v = u + at

16.67 = 0 + a x 5.4

a = 3.09 m/s²

Acceleration is 3.09 m/s²

b) We have equation of motion s = ut + 0.5 at²

Initial velocity, u = 0 m/s

Acceleration, a = 3.09 m/s²

Time, t = 5.4 s

Substituting

s = ut + 0.5 at²

s = 0 x 5.4 + 0.5 x 3.09 x 5.4²

s = 45.05 m

Distance traveled is 45.05 m

c) We have equation of motion s = ut + 0.5 at²

Initial velocity, u = 0 m/s

Acceleration, a = 3.09 m/s²

Displacement, s = 0.25 km = 250 m

Substituting

s = ut + 0.5 at²

250 = 0 x t + 0.5 x 3.09 xt²

t = 12.72 s

Time taken to travel 250 m is 12.72 s

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3 years ago

A group of skydiver are riding in a helicopter up to the spot form which they will jump. As they ride upwards. their gravitation

Dafna1 [17]

A group of skydiver are riding in a helicopter up to the spot form which they will jump. As they ride upwards. their gravitational potential energy increases.

Answer: Option A

<u>Explanation:</u>

Gravitational potential energy refers exerted energy on any object rising from the surface of Earth. It is the measurement of potential energy of any object depending on its position.

We can also define gravitational potential energy as the amount of energy required to raise an object to certain level from the surface of Earth or the work done to raise the object to some position from a position of reference. The formula for calculating the gravitational potential energy is

$\text {Gravitational potential energy}=m g \Delta h$

Here, m is the object's mass, g -the acceleration and $\Delta h$ - the object's distance from the Earth's surface.

So from this formula, it can be confirmed that if the helicopter carrying skydivers are made to ride upwards, then their gravitational potential energy will increase as the distance of helicopter from the Earth's surface is increased on riding the helicopter upwards.

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3 years ago