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3 years ago

7

A charged particle is located in an electric field where the magnitude of the electric field strength is 2.0x10^3 newtons per co

ulomb. If the magnitude of the electrostatic force exerted on the particle is 3.0x10^-3 newton, what is the charge of the particle?

1 answer:

Alexxandr [17]3 years ago

6 0

Answer:

20.7

Explanation:

:0 because basis of the daily occured

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Which of the following statements is true for scientific theories and laws?

exis [7]

Essentially laws and theories are the same thing. In modern day science we don't generate "laws" per se, we call highly tested and sound hypotheses "theories" rather than laws. As such, both things can (and should) be questioned if there is repeatable evidence to support a contradiction. This is what keeps science moving forward.
For example we have Newton's Laws of motion which were shown to be only approximations by the theory of relativity. These were long held as true Laws of Nature but are actually incorrect.

7 0

3 years ago

A beam contains 4.9 × 108 doubly charged positive ions per cubic centimeter, all of which are moving north with a speed of 4.6 ×

Bumek [7]

Answer:

$72.12\ \text{A/m}^2$

south

cross sectional area of the beam

Explanation:

v = Velocity of ions = $4.6\times 10^5\ \text{m/s}$

Number of ions per $\text{cm}^3$ = $4.9\times 10^8$

Charge density would be the product of number of ions per $cm^3$ and the charge of electrons multiplied by 2 as they are doubly charged.

$\rho_q=4.9\times 10^8\times 10^6\times 2\times 1.6\times 10^{-19}\\\Rightarrow \rho_q=0.0001568\ \text{C/m}^3$

Current density is given by

$J=\rho_qv\\\Rightarrow J=0.0001568\times 4.6\times 10^5\\\Rightarrow J=72.12\ \text{A/m}^2$

The current density is $72.12\ \text{A/m}^2$

The direction of the current density is opposite to the movement of the charged particle. The particles are moving north so the direction of current density will be to the south.

Current is given by

$I=JA$

where A is the cross sectional area of the beam .

So the cross sectional area of the beam is required to determine the total current in this ion beam.

8 0

3 years ago

A closed system consists of 0.3 kmol of octane occupying a volume of 5 m3 . Determine

Alenkinab [10]

Answer:

(a). The weight of the system is 336.32 N.

(b). The molar volume is 16.6 m³/k mol.

The mass based volume is 0.145 m³/kg.

Explanation:

Given that,

Weight of octane = 0.3 kmol

Volume = 5 m³

(a). Molecular mass of octane

$M=114.28\ g/mol$

We need to calculate the mass of octane

Mass of 0.3 k mol of octane is

$M=114.28\times0.3\times1000$

$M=34.284\ kg$

We need to calculate the weight of the system

Using formula of weight

$W=mg$

Put the value into the formula

$W=34.284\times9.81$

$W=336.32\ N$

(b). We need to calculate the molar volume

Using formula of molar volume

$\text{molar volume}=\dfrac{volume}{volume of moles}$

Put the value into the formula

$\text{molar volume}=\dfrac{5}{0.3}$

$\text{molar volume}=16.6\ m^3/k mol$

We need to calculate the mass based volume

Using formula of mass based volume

$\text{mass based volume}=\dfrac{volume}{mass}$

Put the value into the formula

$\text{mass based volume}=\dfrac{5}{34.284}$

$\text{mass based volume}=0.145\ m^3/kg$

Hence, (a). The weight of the system is 336.32 N.

(b). The molar volume is 16.6 m³/k mol.

The mass based volume is 0.145 m³/kg.

3 0

3 years ago

Which of the following is NOT an indicator of a chemical reaction?

aliina [53]

Answer:

c

Explanation:

The changing of color of a substance is not necessarily an indicator of a chemical change. For example, changing the color of a metal does not change its physical properties. However, in a chemical reaction, a color change is usually an indicator that a reaction is occurring.

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3 years ago

How many nutrons are in an atom of copper

xeze [42]

Answer:

35 neutrons are in an atom of copper

8 0

3 years ago

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