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4 years ago

What’s the opposite of an electron

1 answer:

7 0

As its charge, proton -a positive charged molecule at the center of an atom- is the opposite of the electron -the particle which is orbiting the center of an atom.

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What acceleration will you give to a 25kg box if you push it with a force of 85N

Grace [21]

<h3>Answer:</h3>

3.4 m/s²

<h3>Explanation:</h3>

We are given;

Mass of the box as 25 kg
Force is 85 N

We are required to determine the acceleration;

According to second newton's law of motion force is given by the product of mass and acceleration.
That is;

Force = ma

Rearranging the formula;

a = F ÷ m

Therefore;

acceleration = 85 N ÷ 25 kg

= 3.4 m/s²

Thus, the acceleration of the box will be 3.4 m/s²

5 0

3 years ago

When a battery, a resistor, a switch, and an inductor form a circuit and the switch is closed, the inductor acts to oppose the c

GaryK [48]

Answer:

The time constant becomes twice.

Explanation:

$T$ = Time constant of the L-R circuit

$L$ = Inductance of the inductor

$R$ = Resistance of the resistor

Time constant of the L-R circuit is given as

$T = \frac{L}{R}\\$

$T_{1}$ = initial time constant of the L-R circuit = $T$

$T_{2}$ = final time constant of the L-R circuit

$L_{1}$ = Initial inductance of the inductor = $L$

$L_{2}$ = Initial inductance of the inductor = $2L$

For the same resistance, the time constant depend directly on the inductance, hence

$\frac{T_{1}}{T_{2}} = \frac{L_{1}}{L_{2}}\\\frac{T}{T_{2}} = \frac{L}{2L}\\\frac{T}{T_{2}} = \frac{1}{2}\\T_{2} = 2T$

7 0

4 years ago

A narrow beam of light containing orange (610 nm) and blue (470 nm) wavelengths goes from polystyrene to air, striking the surfa

Eva8 [605]

Answer: The angle between the two colours when they emerge is 0.4°

Explanation:

The refracting angle for different colors knowing its refractive index can be calculated using Snell's law.

Ni × sin α = Nr × sinβ

Where Ni is the refractive index for light in incident medium

α is the angle the incident makes with normal

Nr is the refractive index for light in the refractive medium

β is the angle the refracted makes with the normal

Making β the subject

β = arcSin ( Ni × sinα)/Nr

For Orange color

The value of refractive index in polystyrene medium is 1.490 ,that is Ni= 1.490

α is 30° and Nr is the refractive index of air = 1

β = arcSin(1.490×sin30°)/1

β= 48.15°

For Blue color

The value of refractive index in polystyrene medium is 1.499,that is Ni= 1.499

α is 30° and Nr is the refractive index of air = 1

β = arcSin(1.499×sin30°)/1

β= 48.55°

The angle between the two colours is the difference in the angles of their refracted rays

48.55-48.15=0.4°

6 0

3 years ago

If you see a rainbow near the time of sunset, where in the sky will the rainbow be?

Igoryamba

Closest to the sun f thats a choice or closest to the atmoshpere

8 0

4 years ago

(a) calculate earth's mass given the acceleration due to gravity at the north pole is 9.830 m/s2 and the radius of the earth is

kakasveta [241]

(a) The value of the gravitational acceleration is given by:

$g=\frac{GM}{r^2}$

where

$G=6.67 \cdot 10^{-11} m^3 kg^{-1} s^{-2}$ is the gravitational constant

M is the Earth's mass

$r=6371 km=6.371 \cdot 10^6 m$ is the Earth's radius at the pole

If we use the value for g given by the problem, $g=9.830 m/s^2$ , and we rearrange the equation above, we find the value of the Earth's mass:

$M=\frac{gr^2}{G}=\frac{(9.830 m/s^2)(6.371 \cdot 10^6 m)^2}{6.67 \cdot 10^{-11} m^3 kg^{-1}s^{-2}}=5.982 \cdot 10^{24} kg$

(b) The value we found for the Earth's mass is $5.982 \cdot 10^{24} kg$ , and we see that this value is slightly larger than the accepted value of $5.979 \cdot 10^{24} kg$ .

5 0

3 years ago