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Bogdan [553]
3 years ago
7

When heather grabbed the glass of ice water, the ice cubes were floating at the top. why were the ice cubes floating in the wate

r?
Physics
1 answer:
tiny-mole [99]3 years ago
8 0
The ice cubes were floating in water because they are less dense than liquid water. When water is frozen, a structure that is crystalline is formed that is held by hydrogen bonding. Due to the orientation of these bonds, the moleules would push far away from each other causing it to have a bigger volume and a lower density.
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an object of 30kg is in free fall in a vacuum where there is no air resistance. Determine the acceleration of the object.
Ivan

We're missing one essential piece of information that we need in order to answer this question.  You have not specified <em>what planet</em> the object is falling on.  The answer depends on the gravitational acceleration on that planet, and they're all different.

Without that information, we'll just go ahead and assume that the object is falling to the surface of the Earth.  Wherever on Earth this tense drama is unfolding, the acceleration of gravity is going to be around <em>9.8 m/s²</em> everywhere.

So THAT's the object's acceleration if there is no air resistance.  The object's MASS makes no difference.  It doesn't matter whether the object is a sparrow feather or a school bus. Heavier objects DO NOT fall faster than light objects.

If there is no air resistance, then ALL objects fall with the same acceleration.    It's called the "acceleration of gravity" on that planet or moon, and you can easily look it up.  It's 9.8 m/s² on Earth, 1.62 m/s² on the Moon, 3.71 m/s² on Mars, 8.87 m/s² on Venus, and 24.8 m/s² on Jupiter.

4 0
3 years ago
How far will a body move in 4 seconds if uniformly accelerated from rest at rate of 2m\sm\s​
Lubov Fominskaja [6]

Answer:

16 m

Explanation:

For an object in uniformly accelerated motion (=with constant acceleration), the distance covered by the body can be found by using the following suvat equation:

s=ut+\frac{1}{2}at^2

where

s is the distance covered

u is the initial velocity

t is the time

a is the acceleration

For the body in this problem,

u = 0 (it starts from rest)

a=2 m/s^2 is the acceleration

Substituting t = 4 s, we find the distance covered:

s=0+\frac{1}{2}(2)(4)^2=16 m

3 0
4 years ago
1. What types of elements does an ionic bond occur between?
sweet [91]

Answer:

Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.

Explanation:

6 0
3 years ago
An air-conditioning system's automatic controller might directly control the A. conversion of pneumatic energy to hydraulic sign
Ilia_Sergeevich [38]

Answer:

A i think so

Explanation:

8 0
3 years ago
Pertaining to simple machines and levers what changes when the fulcrum position is modified?
Inessa [10]

Explanation :

There are many types of simple machines i.e. lever, wedge, pulley, wheel and axle etc.

Fulcrum is the pivot point about which the lever turns. When the position of the fulcrum is shifted, the position of effort changes.

There are three classes of the lever as class 1, class 2 and class 3.

Class 1 includes seesaws and scissors.

class 2 includes wheelbarrow

class 3 includes tongs and tweezers.

7 0
3 years ago
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