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3 years ago

What do we call the days when the sun is directly overhead the equator?

Physics

1 answer:

NikAS [45]3 years ago

8 0

Answer:

Equinox

Explanation:

It is an astronomical phenomenon that is repeated twice a year, in summer and winter, and that is caused because the axis on which our planet rotates is slightly inclined with respect to the plane of translation, this is its trajectory around the Sun.

For this reason there are two equinoxes a year, a phenomenon completely opposite to the solstice, but also marks the beginning of the spring and autumn seasons.

The equinoxes occur around March 20 or 21 and September 22 or 23, and it is the days when the Sun is exactly over the equator, which makes day and night more or less the same duration. The word ‘equinox’ comes from Latin and means precisely ‘same night’. In those two moments the part of the Earth closest to the Sun is the equator.

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A rocket achieves lift off due to ______.

Alex17521 [72]

B.) Action and reaction forces helps during lift off of a rocket.

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4 years ago

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Which will reduce the possible environmental damage associated with mining uranium?

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Answer:

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3 years ago

2. Imagine now that one tried to repeat the same measurement, but between the time that the warm water was measured and the time

Svetllana [295]

Answer:

The final temperature is 64.28°C.

Explanation:

Imagine now that one tried to repeat the same measurement, but between the time that the 400 cm³ of warm water was measured at 88°C and the time it was mixed with the 130 cm³ of cooler water at 15°C, the warmer water had lost 3060 cal to the environment. Calculate the final equilibrium temperature assuming no heat loss after mixing occurs.

Let the temperature of hot water before mixing is t

We need to calculate the temperature

Using formula of energy

$Q=mc\Delta t$

$Q=V\times\rho\times c\times(T_{2}-T_{1})$

Put the value into the formula

$3060=400\times1\times1\times(88-t)$

$3060=400\times88-400t$

$-t=\dfrac{3060-400\times88}{400}$

$t=80.35^{\circ}$

We need to calculate the final temperature

Using formula of temperature

$T_{f}=\dfrac{V_{w}T_{w}+V_{c}T_{c}}{V_{w}+V_{c}}$

Put the value into the formula

$T_{f}=\dfrac{400\times80.3+130\times15}{400+130}$

$T_{f}=64.28^{\circ}C$

Hence, The final temperature is 64.28°C.

5 0

4 years ago

An object accelerating straight down toward the center of the earth is said to be in free-fall due to the force of

kipiarov [429]

Due to the force of gravity

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4 years ago

A 2-kg bowling ball is 1 meter off the ground on a post when it falls. Just before it reaches the ground, it is traveling 4.4 m/

noname [10]

With the given information you can find the initial and final mechanical energies. Then we can verify the conservation of it.

1) Initially the ball is at rest 1 m over the ground, then its mechanical energy is only potential energy = m*g*h = 2kg * 9.8m/s^2 * 1m = 19.6 joule

2) When the ball is above to hit the ground, its mechanical energy is only kinetic energy = [1/2]m*v^2 = [1/2]2kg*(4.4m/s)^2 = 19.4 joule

Those results, taken into account that the measures have some errors (for example the exact velocity of the ball when it reaches de floor is quite difficult to measure) confirm the conservation of the energy.

Then, the answer is the option B. The mechanical energy is conserved

7 0

3 years ago

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