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3 years ago

What is true of all places on earth during the equinoxes

Physics

2 answers:

tia_tia [17]3 years ago

6 0

Answer:There is approximately equal length of night and day in all places of the earth during equinoxes.

Explanation: At some point in the earth's revolution around the sun, it's observed that the earth's axis doesn't tilt towards nor away from the sun.

So this results to nearly equal amount of darkness and daylight across the earth. This happens just twice in a year around March 20-21 and September 22-23.

taurus [48]3 years ago

4 0

Answer:

The length and duration of the day time and the length and duration of the night time are the same all over the planet.

Explanation:

Equinox is known as the period of time when the plane of Earth's equator passes through the center of the Sun. This occurs twice each year.

it is the moment at which the center of the visible Sun is directly above the equator.

At Equinox, the daytime and nighttime are of approximately equal duration all over the planet. Although, They are not totally and exactly equal.

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A man lifts a 120 kg barbell 2 m above the ground . What is the gain in gravitational PE of the barbell?

SpyIntel [72]

Answer:

2,352 Joules

Explanation:

At the ground, the barbell has a classical mechanical energy value of zero. There is no classical kinetic or potential energy for the barbell. The moment the man starts to lift the barbell, he does work on the barbell and transfers kinetic energy to it due to the motion. At its maximum height where the man lifts the barbell to a stop, the kinetic energy is zero because it transformed into gravitational potential energy stored in the gravitational field. Our reference point for potential was defined to be zero at the floor, therefore we can say that the gravitational potential energy at 2 meters is:

$U=mgh=(120kg)(9.8m/s^2)(2m)=2,352J$

7 0

2 years ago

Two objects are in freefall. Object A experiences a gravitational force of

Vlad1618 [11]

Answer:

Both the objects A and B will have the same acceleration.

Explanation :

The objects will have the same acceleration as both are under free fall condition. When objects are under the free fall condition, the only force that acts on the object is its weight.

Weight is the force acting on a body of some mass, and the formula for finding the weight of a body is- Weight = mass × acceleration due to gravity(g).

Therefore, here the different weight is due to the difference masses of both bodies, and not due to the different acceleration values.

3 0

3 years ago

Study the motion map shown. what do the circled vectors represent?

BabaBlast [244]

Answer:

It's option d - Negative acceleration

Explanation:

Let's start by demonstrate why it's not option b - Speed : Speed is a scalar quantity so it can not be represented by a vector

Let's check that the green vectors represent velocity (velocity is a vector quantity, velocity is a direction aware, while speed is just a scalar)

Now let's show that the circled vectors are acceleration vectors:

Mathematically position X , velocity V and acceleration A are:

$\frac{dX}{dt} = V$ and $\frac{dV}{dt} = A$

Where X, V, A are vectors and $\frac{d(a)}{dt} = b$ indicates the derivate a of a time is equal to b.

So, this show that acceleration is a rate respect of time of velocity ⇒ When acceleration is positive, velocity increments, when acceleration is negative, velocity decrements.

The above explanation correspond to the motion map shown, getting demonstrated that the answer is D - Negative acceleration

3 0

3 years ago

Which of the following is a correct comparison of a compact fluorescent lamp and incandescent light bulbs?

Alekssandra [29.7K]

The correct answer is C.

Hope I helped.

8 0

3 years ago

Read 2 more answers

What kind of error duo you think is used in the side-view mirror of cars?

tatyana61 [14]

Answer:

Here's a list of the 10 most common mistakes we humans make when operating an automobile.

Crossing Lanes While Turning.

Using Your Daylights At Night. ...

Bad Seating Position. ...

Riding The Brakes. ...

Leaving Your High Beams On. ...

Not Using Your Turn Signal. ...

Driving Slowly In The Passing Lane. ...

Not Adjusting The Mirrors Properly. ...

6 0

3 years ago