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3 years ago

Physics // how i solve?

Physics

1 answer:

Alex3 years ago

7 0

V=IR

180mA=V/R

I=2V/3R

I=2/3 x 180 mA =120 mA

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A 0.09 g honeybee acquires a charge of +23 pc while flying. The earth's electric field near the surface is typically (100 N/C, d

hodyreva [135]

Answer:

$2.6\times 10^{-5}$

Explanation:

<u>Given:</u>

$m$ = mass of the honeybee = 0.09 g = $9\times 10^{-5}\ kg$

$q$ = charge on the honeybee = 23 pC = $2.3\times 10^{-11}\ C$

$E$ = electric field near the surface of earth = 100 N/C

<u>Assume:</u>

$g$ = acceleration due to gravity = $9.8\ m/s^2$

$W$ = weight of the honeybee

$F$ = electric force on the honeybee

$R$ = ratio of the electric force and the weight of the honeybee

We know that

$F = qE\,\,\, and\,\,\, W = mg\\\therefore R = \dfrac{F}{W}\\\Rightarrow R = \dfrac{qE}{mg}\\\Rightarrow R = \dfrac{2.3\times 10^{-11}\ C\times 100 N/C}{9\times 10^{-5}\ kg\times 9.8\ m/s^2}\\\Rightarrow R = 2.6\times 10^{-6}$

So, the ration of the electric force on the bee to its weight is $2.6\times 10^{-6}$ .

On multiplying this ration by 10, the ratio becomes $2.6\times 10^{-5}$ .

8 0

4 years ago

Which of the following is not an equation of motion:- v=u+at; s=ut+at; v^2-u^2=2as; s=ut+1/2 at^2

Sladkaya [172]

Answer:

s=ut+at

its not the equation of motion..

<h2>hope it helps </h2><h2>stay safe healthy and happy.....</h2>

8 0

3 years ago

A coil with 25 turns of wire is moving in a uniform magnetic field of 1.5 T. The magnetic field is perpendicular to the plane of

leonid [27]

Given that,

Number of turns, N = 25

Magnetic field, B = 1.5 T

The coil has a crosssectional area of 0.80 m2

The coil exits the field in 1.0 s.

To find,

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Solution,

The induced emf in the coil is given by :

$\epsilon=\dfrac{-d\phi}{dt}\\\\=\dfrac{dB}{dt}\\\\=\dfrac{NBA}{t}\\\\=\dfrac{25\times 1.5\times 0.8}{1}\\\\=30\ V$

So, the induced emf in the coil is 30 V.

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3 years ago

4. If a 15 kg object is accelerating at a rate of so

Lena [83]

Answer:

525 N

Explanation:

Force = mass * acceration

= 15 * 35

= 525 N

8 0

3 years ago

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mylen [45]

Answer: B 1/5, D .20

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3 0

3 years ago