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chubhunter [2.5K]
3 years ago
8

A roller coaster car travels up and down the hills of its track. Neglecting

Physics
1 answer:
Volgvan3 years ago
7 0

Answer:

option D is the correct option

Must always remain constant

Explanation:

According to their law of conservation of energy :it states that in a closed system,the total mechanical energy is always constant although energy may change from one form to another. e. g from potential energy to kinetic energy

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If a 70kg swimmer pushes off a pool wall with a force of 250N. What is her acceleration?
Alenkasestr [34]

Newton taught us:                              Force = (mass) x (acceleration)

Divide each side by (mass) :              Acceleration = (force) / (mass) .

The only problem here is:  This formula applies when the "Force" is the
only force on the object.  When the objects in these school problems are
falling out of airplanes, shot from guns, or being hit by baseball bats, we
routinely ignore the force of air resistance against the object.  We're
comfortable with that, maybe because it's become a habit.  But now,
we're not so comfortable about ignoring the force of water resistance.

All I can tell you is that if you DO ignore the water resistance, that is,
if the water were not there, her acceleration would be

                    (250 newtons) / (70 kg) = 3.57 m/s² = about  0.36 g .

But what is it really, in the water ? 

If you've spent any substantial amount of time anywhere near competitive
swimmers, then you know that it depends on their position coming off the
wall, what they do with their knees and knuckles, how straight they hold
their body, how deep the texture of their swim-cap is, and how well they've
shaved their legs.

6 0
4 years ago
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In a tug of war, when one team is pulling with a force of 85 N and the other 40 N, what is the net
olya-2409 [2.1K]
85 N - 40 N = 45 N
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4 0
3 years ago
Which symbol and unit of measurement are used for electric current?
Burka [1]

Answer: Symbol is I and unit A

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HOPE THIS HELPS!!!!!!!!

4 0
3 years ago
atoms are composed of several basic types of very small ____; the ____ of each of these particles gives a different kinds of ato
Lesechka [4]

Answer:

An atom is the smallest unit of matter that retains all of the chemical properties of an element. Atoms combine to form molecules, which then interact to form solids, gases, or liquids. For example, water is composed of hydrogen and oxygen atoms that have combined to form water molecules. Many biological processes are devoted to breaking down molecules into their component atoms so they can be reassembled into a more useful molecule.

Atomic Particles

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged). Atoms have different properties based on the arrangement and number of their basic particles.

The hydrogen atom (H) contains only one proton, one electron, and no neutrons. This can be determined using the atomic number and the mass number of the element (see the concept on atomic numbers and mass numbers).

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3 years ago
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Which of the following statements is true?
seraphim [82]
All of the above statements are true.
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4 years ago
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