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AysviL [449]
3 years ago
12

Why did scientists compare megalodons and great white sharks? SCIENCE

Physics
1 answer:
GenaCL600 [577]3 years ago
4 0
They have similar growth trajectories
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A roller coaster has a mass of 650 kg. It sits at the top of a hill with height 78 m. If it drops from this hill, how fast is it
Leto [7]

Answer:

The roller coaster is going at 39.1 m/s when it reaches the bottom

Explanation:

We use conservation of mechanical energy to solve this problem. So, we need to estimate the potential energy of the cart at the top of the hill while it is sitting steady there. Such will give us the cart initial Total Energy (TE) since its kinetic energy at that moment is zero (the cart is not moving, just sitting at the top of the hill).

Its initial potential energy (Ui) is therefore: Ui=m*g*h=650 * 9.8 * 78=496860 J

Notice also that all units given are in the SI system, (including the acceleration of gravity g) and therefore the answer is in Joules.

As we said, this initial potential energy equals the Total Energy  (TE) of the roller coaster because its initial Kinetic Energy (Ki) is zero.

When we look at what happens the instant the cart reaches the bottom, at that point it has all kinetic energy and zero potential energy (h is zero at the bottom of the hill). Final Kinetic Energy is by definition: Kf =\frac{1}{2} m*v^2=\frac{1}{2}650*v^2=325 v^2

Therefore, the conservation of mechanical energy tells us that:

ET_i=ET_F\\U_i+K_i=U_F+K_F\\496860 J +0J=0J+325v^2

We can solve for the final velocity of the roller coaster in this equation by solving for it in the equation:

496860 J +0J=0J+325v^2\\\\496860J=325v^2\\v^2=\frac{496860}{325} =1528.8\\v=\sqrt{1528.8} = 39.1 \frac{m}{s}

The velocity should result with units of meters/second since all quantities were given in SI units.

5 0
3 years ago
What do deltas and natural levees have in common?
Tpy6a [65]
They are both formed by deposited river sediment.
7 0
3 years ago
When did rock layer H form relative to the other rock layers? In your answers, compare layer H to as many rock layers as you can
AfilCa [17]

Halitic rocks have a large mineral layer of evaporite sedimentary rock, which is produced from drained lakes, playa and closed seas.

The difference between Halit rock layers and other rock layers is the element in it. The element in the Halit rock layer is sodium chloride.

<h2>Further explanation </h2>

Halit Rock Layer is a type of salt, a mineral form (natural) from sodium chloride (NaCl) or better known as rock salt.

Knowledge about the layers of soil and rocks on the surface of the earth is stratigraphy. Stratigraphy is the study of the history, composition and relative age and distribution of bedding layers and the interpretation of rock layers to explain the history of the Earth.

Learn More

  1. Sodium chloride (NaCl) brainly.com/question/7007192
  2. stratigraphy brainly.com/question/12372481

Details

Class: Middle School

Subject: Physics

Keywords: Rock Layer, Halit Rock, Stratigraphy

7 0
3 years ago
Read 2 more answers
Give one example in which both physical and chemical changes takes places ​
daser333 [38]

Answer:

during respiration physical and chemical change both are occuring

Explanation:

4 0
3 years ago
Read 2 more answers
A star produces energy by? ( a p e x )
katen-ka-za [31]

Answer and Explanation:

Stars create energy primarily through the fusion of hydrogen into helium through nuclear reactions.

3 0
3 years ago
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