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miskamm [114]
3 years ago
5

What is the minimum magnitude of an electric field that balances the weight of a plastic sphere of mass 14.2 g that has been cha

rged to 7.7 nC. Give your answer to the nearest 0.1 MN/C (mega Newton per Coulomb)
Physics
1 answer:
weeeeeb [17]3 years ago
8 0

Answer: 18 MN/C

Explanation: Taking into account the weigth (m* g) and electric force for a charge in a electric fiel as (q*E) both are equals

so 0.0142 Kg*9.8 m/s^2= q*E

thus E= (0.0142*9.8)/(7.7*10^-9)

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1. The names of the compounds FeS, NaCl, NaOH, and Pb(CN)2 all end in the suffix A. -ite. B. -ic. C. -ide. D. -ate.
shtirl [24]
They all end with suffix "-ide"

In short, Your Answer would be Option C

Hope this helps!
5 0
3 years ago
A thin, rectangular sheet of metal has mass M and sides of length a and b. Find the moment of inertia of this sheet about an axi
Lubov Fominskaja [6]

Answer:

The moment of inertia is I=\frac{M}{12} a^{2}

Explanation:

The moment of inertia is equal:

I=\int\limits^a_b {r^{2} } \, dm

If r is -\frac{a}{2}

and dm=\frac{M}{a} dr

I=\int\limits^a_b {r^{2}\frac{M}{a}  } \, dr\\a=\frac{a}{2} \\b=-\frac{a}{2}

I=\frac{M}{a} \int\limits^a_b {r^{2}  } \, dr\\\\I=\frac{M}{a} (\frac{M}{3} )_{b}^{a}\\  I=\frac{M}{3a} (\frac{a^{3} }{8} +\frac{a^{3} }{8} )\\I=\frac{M}{12} a^{2}

7 0
4 years ago
14. A ball initially at rest rolls without slipping
elena-s [515]

Answer:

v = √(10gh/7)

Explanation:

Initial gravitational energy = final rotational energy + kinetic energy

PE = RE + KE

mgh = ½ Iω² + ½ mv²

For a solid sphere, I = ⅖ mr².

For rolling without slipping, ω = v/r.

mgh = ½ (⅖ mr²) (v/r)² + ½ mv²

mgh = ⅕ mv² + ½ mv²

mgh = 7/10 mv²

10/7 gh = v²

v = √(10gh/7)

7 0
3 years ago
as you sit on a dock, you notice a wave crest pass. you count another 16 wave crests in the next eight seconds. what is the freq
uysha [10]
The SI unit for frequency is Hertz (Hz), or simply, the reciprocal of a second. It measures how fast an object could be moving. In this case, the frequency would be 16 wave crests per 8 seconds (16/8 = 2). In simplified answer, the frequency is 2 per second, or 2 Hz.
5 0
3 years ago
Read 2 more answers
A sharp knife cut things easily​
Lostsunrise [7]

Answer:

its due to less surface area of action

pressure is high

4 0
3 years ago
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