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3 years ago

Is newton third law accurate for electric forces?

1 answer:

7 0

An object with greater charge will exert a greater force on an object than an object with smaller charge would. However, if you consider two charges that exert a force on each other, regardless of the magnitude of charge, both charges will exert an equal force on each other because of Newton's third law.

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You have two steel solid spheres. sphere 2 has twice the radius of sphere 1. part a by what factor does the moment of inertia i2

sertanlavr [38]

Answer:

moment of inertia of sphere 2 is 32 times the moment of inertia of sphere 1

Explanation:

The moment of inertia of a solid sphere about its axis is

$I=\frac{2}{5}MR^2$

where

M is the mass of the sphere

R is the radius of the sphere

The mass of the sphere can be rewritten as

$M=\rho V$

where

$\rho$ is the density

$V=\frac{4}{3}\pi R^3$ is the volume of the sphere

So the moment of inertia becomes

$I=\frac{2}{5}(\frac{4}{3}\pi \rho R^3)R^2 = \frac{8}{15}\pi \rho R^5$

Calling R the radius of sphere 1, the moment of inertia of sphere 1 is

$I_1=\frac{8}{15}\pi \rho R^5$

where $\rho$ is the density of steel, since the sphere is made of steel

Sphere 2 has twice the radius of sphere 1, so

R' = 2R

and so its moment of inertia is

$I_2=\frac{8}{15}\pi \rho R'^5=\frac{8}{15}\pi \rho (2R)^5=32(\frac{8}{15}\pi \rho R^5)=32I_1$

So, the moment of inertia of sphere 2 is 4 times the moment of inertia of sphere 1.

4 0

3 years ago

What would the average speed in kph of a horse and rider be if they cover a total distance of 14 km in 249 minutes

romanna [79]

Average speed = (distance covered) / (time to cover the distance)

Average speed = (14 km) / (249 min)

Average speed = (14/249) (km/min)

Average speed = (14/249) (km/min) x (60 min/hr)

Average speed = (14 x 60 / 249) km/hr

<em>Average speed = 3.37 km/hr</em>

8 0

4 years ago

An object with mass 1.2 kg is moving at a constant speed in a circle with radius 2.5 m. If the

SpyIntel [72]

Answer:

3.9m/s² is the acceleration

4 0

3 years ago

Write down the principle of lever? <br>= ????

Ipatiy [6.2K]

The principle of a lever is when two equal forces act in opposite directions and ultimately come to a state of equilibrium if distanced properly

i hope that helps?^

7 0

3 years ago

What is the nineth plant closet to the sun

marusya05 [52]

My Very Excellent Mother Just Served Us Nachos
(or Nine pickles if Pluto was a planet)

Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune
(Pluto)

hope that helped

4 0

3 years ago

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