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4 years ago

What does experimenter selected control mean?

Physics

1 answer:

ladessa [460]4 years ago

4 0

The way in which the sample of participants is obtained from the experimental technique

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3.An object that begins at rest has an acceleration of 2 m/s/s What is its instantaneous speed after 3 seconds?

neonofarm [45]

The speed will be 6m/s i believe

6 0

4 years ago

H2O consists of polar molecules. CO2 consists of nonpolar molecules. How do chemists explain this difference?

Vadim26 [7]

C. Oxygen has a different attraction for electrons in H2O than in CO2

the covalent bond between Hydrogen-Oxygen and Carbon-Oxygen is different because the difference of electronegativity (the tendency of an atom to attract a shared pair of electrons towards itself) between Hydrogen and Oxygen is a lot higher than the difference of electronegativity between Carbon and Oxygen. This difference in electronegativity results in separation of partial electric charge creating polar bonds and giving the molecule a polarity.

8 0

3 years ago

Read 2 more answers

How can wasted energy be made useful?

murzikaleks [220]

Answer:

by using it in a such place or thing which needs it or which can work with it

7 0

2 years ago

The "size" of the atom in Rutherford's model is about 1.0 x 10^−10 m. (a) Determine the attractive electrostatic force between a

bazaltina [42]

Answer:

(a) $2.31\times10^{-8}\ N$

(b) $1.44\times 10^{-19}\ eV$

Explanation:

Given:

*p = charge on proton = $1.602\times 10^{-19}\ C$

*e = magnitude of charge on an electron = $1.602\times 10^{-19}\ C$

*r = distance between the proton and the electron in the Rutherford's atom = $1.0\times 10^{-10}\ m$

Part (a):

Since two unlike charges attract each other.

According to Coulomb's law:

$F=\dfrac{kqe}{r^2}\\\Rightarrow F = \dfrac{9.0\times 10^{9}\times 1.602\times 10^{-19}\times 1.602\times 10^{-19}}{(1.0\times 10^{-10})^2}\\\Rightarrow F = 2.31\times 10^{-8}\ N$

Hence, the attractive electrostatic force of attraction acting between an electron and a proton of Rutherford's atom is $2.31\times 10^{-8}\ N$ .

Part (b):

Potential energy between two charges separated by a distance r is given by:

$U= \dfrac{kqQ}{r}$

So, the potential energy between the electron and the proton of the Rutherford's atom is given by:

$U = \dfrac{kqe}{r}\\\Rightarrow U = \dfrac{9\times 10^{9}\times1.602\times 10^{-19}\times e}{1.0\times 10^{-10}}\\\Rightarrow U = 1.44\times 10^{-19}\ eV$

Hence, the electrostatic potential energy of the atom is $1.44\times 10^{-19}\ eV$ .

3 0

4 years ago

The 225-N force is exerted on the crate towards the north and the 165-N is exerted toward the East what's the magnitude and dire

Rudik [331]

Answer:

≅279.02 N, 36° 15' from North to East

Explanation:

You can the theory of triangle of forces to find the answer.

Two forces are acting perpendicular to each other so use Pythagoras theorem to find the magnitude of the resultant force(x).

x² = 225² + 165²

x = 279.02 N

To find the direction use the same force triangle,

Workings are in the attachment,

Download pdf

6 0

4 years ago