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2 years ago

Two objects perform the same task. One has thousands of moving parts while the other has no moving parts. What are they?.

Physics

1 answer:

Natalka [10]2 years ago

5 0

The two objects perform the same task of measuring time and they are hourglass and sundial.

<h3>What is an hourglass?</h3>

An hourglass is a device used to measure the passage of time.

The hourglass contains two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance from the upper bulb to the lower one.

<h3>What is a sundial?</h3>

A sundial is a horological device that is used to measure time of the day when there is sunlight by the apparent position of the Sun in the sky. Unlike hourglass, its doesn't move.

Thus, the two objects perform the same task of measuring time and they are hourglass and sundial.

Learn more about time measurement here: brainly.com/question/13893070

#SPJ1

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2 years ago

In Shinto, there is s strong emphasis on purification and recognition of the role environment plays in creating harmony. Explore

Savatey [412]

Answer:

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3 years ago

Christian made some pancakes she's so 3/5 of them in the morning and 1/4 of the remainder in the afternoon is she had 300 pancak

DiKsa [7]

Christian made 1000 pancakes.

Explanation:

Let us represent the total amount of Pancake made by Christian as = K

From the problem;

Christian ate $\frac{3}{5}$ of the pancake in the morning = $\frac{3}{5}$ * K = $\frac{3}{5}$ K

We know that Christian cannot eat her pancake and at the same time have it, the remaining pancake will then be:

total amount of cake - fraction eaten

Remainder = K - $\frac{3}{5}$ K= $\frac{2}{5}$ K

In the afternoon, we know that she ate 1/4 of the remaining cake:

$\frac{1}{5}$ K* $\frac{2}{5}$ K = $\frac{1}{10}$ K

The remaining cake in the afternoon will be:

Total amount of cake remaining from morning - amount eaten in the afternoon

= $\frac{2}{5}$ K - $\frac{1}{10}$ K

= $\frac{3}{10}$ K

The fraction of the cake remaining in the afternoon is $\frac{3}{10}$ K

Since she had 300cakes left in the afternoon, then :

$\frac{3}{10}$ K= 300

K = 1000 pancakes

Therefore Christian made 1000 pancakes.

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3 years ago

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3 years ago

50 points !! I need help asap.......Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls to t

r-ruslan [8.4K]

1) At the top of the building, the ball has more potential energy

2) When the ball is halfway through the fall, the potential energy and the kinetic energy are equal

3) Before hitting the ground, the ball has more kinetic energy

4) The potential energy at the top of the building is 784 J

5) The potential energy halfway through the fall is 392 J

6) The kinetic energy halfway through the fall is 392 J

7) The kinetic energy just before hitting the ground is 784 J

Explanation:

The potential energy of an object is given by

$PE=mgh$

where

m is the mass

g is the acceleration of gravity

h is the height relative to the ground

While the kinetic energy is given by

$KE=\frac{1}{2}mv^2$

where v is the speed of the object

When the ball is sitting on the top of the building, we have

$h=40 m$ , therefore the potential energy is not zero
$v=0$ , since the ball is at rest, therefore the kinetic energy is zero

This means that the ball has more potential energy than kinetic energy.

When the ball is halfway through the fall, the height is

$h=20 m$

So, half of its initial height. This also means that the potential energy is now half of the potential energy at the top (because potential energy is directly proportional to the height).

The total mechanical energy of the ball, which is conserved, is the sum of potential and kinetic energy:

$E=PE+KE=const.$

At the top of the building,

$E=PE_{top}$

While halfway through the fall,

$PE_{half}=\frac{PE_{top}}{2}=\frac{E}{2}$

And the mechanical energy is

$E=PE_{half} + KE_{half} = \frac{PE_{top}}{2}+KE_{half}=\frac{E}{2}+KE_{half}$

which means

$KE_{half}=\frac{E}{2}$

So, when the ball is halfway through the fall, the potential energy and the kinetic energy are equal, and they are both half of the total energy.

Just before the ball hits the ground, the situation is the following:

The height of the ball relative to the ground is now zero: $h=0$ . This means that the potential energy of the ball is zero: $PE=0$

The kinetic energy, instead, is not zero: in fact, the ball has gained speed during the fall, so $v\neq 0$ , and therefore the kinetic energy is not zero