All categories

3 years ago

A possible explanation for a set of facts that can be tested by further investigation is called a blank

Physics

2 answers:

Serjik [45]3 years ago

6 0

hypothesis is the blank

nadezda [96]3 years ago

3 0

Answer;

Hypothesis

Explanation;

A hypothesis is a tentative explanation that accounts for a set of facts and can be tested by further investigation. Scientific hypotheses must be posed in a form that allows them to be tested.

- It represents a possible explanation for an observation, phenomenon, or scientific problem that can be tested by further investigation. Once you do the experiment and find out if it supports the hypothesis, it becomes part of scientific theory. An example of a hypothesis; Hypothesis: Bacterial growth may be affected by temperature.

You might be interested in

When a scientific calculator shows the quantity below, what does it mean? 1.5E8

jenyasd209 [6]

1.5 with 8 exponent of 10.
1.5 x 100000000
150000000

6 0

2 years ago

Most ___________________ are located on the ocean floor.

Vaselesa [24]

Answer:

Transform boundaries

Explanation:

I TOOK A TEST ON THIS QUESTION

4 0

3 years ago

What might happen if water molecules did not have a slight negative charge on one end and a slight positive charge on the other?

Katena32 [7]

Answer:

It would not be possible the cohesion among water molecules by the polar covalent bonding.

Well, to understand this in a better way, let's begin by explaining that water is special due to its properties, which makes this fluid useful for many purposes and for the existence of life.

In this sense, one of the main properties of water is cohesion (molecular cohesion), which is the attraction of molecules to others of the same type. So, water molecule ( $H_{2}O$ ) has 2 hydrogen atoms attached to 1 oxygen atom and can stick to itself through hydrogen bonds.

How is this possible?

By the polar covalent bonding, a process in which electrons are shared unequally between atoms, due to the unequal distribution of electrons between atoms of different elements. In other words: slightly positive and slightly negative charges appear in different parts of the molecule.

Now, it can be said that a water molecule has a negative side (oxygen) and a positive side (hydrogen). This is how the oxygen atom tends to monopolize more electrons and keeps them away from hydrogen. Thanks to this polarity, water molecules can stick together.

5 0

4 years ago

A grapefruit falls from a tree and hits the ground 0.72 s later.

xxTIMURxx [149]

Answer:

The grapefruit dropped 2.54 m and hit the ground at 7.06 m/s

Explanation:

Free Fall Motion

A free-falling object falls under the sole influence of gravity. Any object that is being acted upon only by the force of gravity is said to be in a state of free fall. Free-falling objects do not encounter air resistance.

If an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is $g = 9.8 m/s^2.$

The final velocity of a free-falling object after a time t is given by:

vf=g.t

The distance traveled by a dropped object is:

$\displaystyle y=\frac{gt^2}{2}$

Given a grapefruit free falls from a tree and hits the ground t=0.72 s later, we can calculate the height it fell from:

$\displaystyle y=\frac{9.8\cdot 0.72^2}{2}$

y = 2.54 m

The final speed is computed below:

$vf=9.8\cdot 0.72$

vf = 7.06 m/s

The grapefruit dropped 2.54 m and hit the ground at 7.06 m/s

6 0

3 years ago

If a box is pushed across a floor with a force of 130N. The frictional force acting between the box and the floor is 30N, over a

Sidana [21]

The force acting in the front direction is the 130N.
The frictional force is acting backwards 30N.

1) The net force is 130N - 30N = 100N

2) s = ut + (1/2)at^2    u = 0, Start from rest, s = 25m t =5.

25 = 0*5 + (1/2)* a * 5^2.

25 = 0 + 25/2 * a.

25 = (25/2)a. Divide 25 from both sides.

1 = (1/2)* a. Cross multiply.

2 = a.

a = 2 m/s^2.

3) Mass of the box
Net Force, F = ma
   100 = m*2. Divide both sides by 2.

   100/2 = m
   50    = m.
      m = 50 kg.

4) Final velocity ,   v = u + at.
   v = 0 + 2*5 = 10 m/s.

   Kinetic Energy, K = (1/2) * mv^2.
      = 1/2 * 50 * 10 * 10.
      = 2500 J.

3 0

3 years ago