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noname [10]
4 years ago
8

How many years older will you be 1.70 billion seconds from now? (Assume a 365-day year.)

Physics
1 answer:
dexar [7]4 years ago
6 0
1.70 billion seconds older than i am now

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The first hill of a roller coaster is 42.0 meters high. The roller coaster drops to a height of
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<u>Velocity = 27.2 m/s</u>

<u>Explanation:</u>

The velocity at the bottom of the first hill can be determined with the change in Kinetic energy. Due to energy conversion, both the change in kinetic energy and potential energy is same when the height is changed.

So, by applying the formulas:

KE = \frac{m v^{2}}{2}

where KE is Kinetic energy, m is the mass and v is the Velocity.

PE = mgh

where PE is Potential energy, m is the mass, g is the gravitational force and h is the height.

Since, both the energies are equal, we can write:

PE = KE

\frac{m v^{2}}{2} = mgh

v²   = 2gh

v     = \sqrt{2 g h}

To Substitute:

h = 42 - 4.2 = 37.8 m

g = 9.8 m/s²

So, v = \sqrt{2 \times 9.8 \times 37.8}

        = 27.2 m/s

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4 years ago
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Which of the following numbers is equal to an object's acceleration?
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Chiefly in science fiction) an invisible barrier of exerted strength or impetus.
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