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Harrizon [31]
2 years ago
11

A 650-kg roller coaster starts from rest at the top of a 80 m hill.

Physics
1 answer:
Flura [38]2 years ago
7 0

Answer:

or a roller coaster loop, if it were perfectly circular, we would have a minimum speed of vmin=√gR at the top of the loop where g=9.8m/s2 and R is the radius of the 'circle'. However, most roller coaster loops are actually not circular but more elliptical.

Explanation:

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The response of an object to the force of gravity is called
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Reaction force/support force/ lift/ buoyancy/ weight depends on situation
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3 years ago
Tycho Brahe built the first what?
wlad13 [49]

Answer:

Brahe showed irregularities in the Moon's orbit and discovered a new star in the Cassiopeia formation. Brahe invented many instruments such as the Tyconian Quadrant which were widely copied and led to the invention of improved observational equipment. In 1600, Tyco Brahe hired Johannes Kepler as his assistant.

Explanation:

https://www.google.com/search?q=Tycho+Brahe+built+the+first+what%3F&rlz=1C1CHBF_enUS880US880&oq=Tycho+Brahe+built+the+first+what%3F&aqs=chrome..69i57j69i61.1130j0j7&sourceid=chrome&ie=UTF-8

6 0
3 years ago
A rock is rolling down a hill. At position 1, it’s velocity is 2.0 m/s. Twelve seconds later, as it passes position 2, it’s velo
mr Goodwill [35]

Answer

Hi,

correct answer is {D} 3.5 m/s²

Explanation

Acceleration is the rate of change of velocity with time. Acceleration can occur when a moving body is speeding up, slowing down or changing direction.

Acceleration is calculated by the equation =change in velocity/change in time

a= {velocity final-velocity initial}/(change in time)

a=v-u/Δt

The units for acceleration is meters per second square m/s²

In this example, initial velocity =2.0m/s⇒u

Final velocity=44.0m/s⇒v

Time taken for change in velocity=12 s⇒Δt

a= (44-2)/12  = 42/12

3.5 m/s²

Best Wishes!

5 0
3 years ago
Find the initial velocity
Alla [95]

Answer:

A car accelerates uniformly from 5m/s to 10m/s in 5s ...

A car starts from rest and picks up a velocity of 20 m/s ...

A car accelerates uniformly from 10m/s to 20m/s in 5 ...

How much work is required to accelerate a 1000 kg car ...

More results from<u> www.quora.com</u>

Explanation:

4 0
3 years ago
You and your friend Peter are putting new shingles on a roof pitched at 20°. You're sitting on the very top of the roof when Pet
dexar [7]

Answer:

vi = 3.95 m/s

Explanation:

We can apply the Work-Energy Theorem as follows:

W = ΔE = Ef - Ei

W = - Ff*d

then

Ef - Ei = - Ff*d   <em> </em>

If

Ei = Ki + Ui = 0.5*m*vi² + m*g*hi = 0.5*m*vi² + m*g*hi = m*(0.5*vi² + g*hi)

hi = d*Sin 20º = 5.1 m * Sin 20º = 1.7443 m

Ef = Kf + Uf = 0 + 0 = 0

As we know,   vf = 0  ⇒ Kf = 0

Uf = 0  since hf = 0

we get

W = ΔE = Ef - Ei = 0 - m*(0.5*vi² + g*hi)  ⇒   W = - m*(0.5*vi² + g*hi)   <em> (I)</em>

<em />

If

W = - Ff*d = - μ*N*d = - μ*(m*g*Cos 20º)*d = -  μ*m*g*Cos 20º*d    <em>(II)</em>

<em />

we can say that

<em />

- m*(0.5*vi² + g*hi) = -  μ*m*g*Cos 20º*d  

⇒ vi = √(2*g*(μ*Cos 20º*d - hi))  

⇒ vi = √(2*(9.81 m/s2)*(0.53*Cos 20º*5.1m - 1.7443 m)) = 3.95 m/s

<em />

6 0
3 years ago
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