1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
agasfer [191]
3 years ago
13

Please help me with this.

Physics
1 answer:
Stells [14]3 years ago
7 0
The answer is D, only B is a mineral. I always look at it as mineral's atoms are usually closer together but always check your answers.
You might be interested in
An example of a Natural electric field is
liberstina [14]

Answer:

Lightning

Explanation

6 0
3 years ago
Read 2 more answers
What is it that lives if it is fed, and dies if you give it a drink?
Anna71 [15]

Fire is it that lives if it is fed, and dies if you give it a drink.

<h3><u>Explanation:</u></h3>

Fire is very essential part of human life. It is used for cooking food and for other important activities. Without fire we cannot not survive. Something or the other should be heated before consumption and this can be achieved only with fir. It is also used in the darker places for viewing many things around us.

Thus, fire can survive if we give fuel or any wooden pieces and when water is poured on it it will turn off. Hence Fire is the one that survives when it is fed and dies when water is given as a drink to it.

4 0
3 years ago
Wood is an example of <br> A. Metalloid<br> B. Insulator<br> C. Nonmetal<br> D. Conductor
Colt1911 [192]
The Answer is b: insulator
4 0
2 years ago
A parallel-plate capacitor has square plates that are 7.20 cm on each side and 3.40 mm apart. The space between the plates is co
Lilit [14]

Answer:

U = 218 nJ

Explanation:

We are given;

Spacing between the plates; d = 3.4 mm = 3.4 × 10^(-3) m

Voltage across the capacitor; V = 96 V

Dimension of the square plates is 7.2cm x 7.2cm.

So, Area = 7.2 × 7.2 = 51.84 cm² = 51.84 × 10^(-4) m²

Permittivity of free space; ε_o = 8.85 × 10^(-12) C²/N.m²

From relative permeability table;

Dielectric constant of Pyrex; k1 = 5.6

Dielectric constant of polystyrene; k2 = 2.56

Now, formula for capacitance of a capacitor with Dielectric is;

C = kC_o

Where, C_o = ε_o(A/d)

Since there are 2 capacitors, d will now be d/2 = (3.4 × 10^(-3))/2 m = 1.7 × 10^(-3)

Since we have 2 capacitor, thus ;

C1 = k1*ε_o*(A/d)

C1 = (5.6 × 8.85 × 10^(-12) × (51.84 × 10^(-4))/(1.7 × 10^(-3))

C1 = 1.51 × 10^(-10) F

Similarly;

C2 = (2.56 × 8.85 × 10^(-12) × (51.84 × 10^(-4))/(1.7 × 10^(-3))

C2 = 0.691 × 10^(-10) F

For capacitors in series, formula for total capacitance(Cs) is;

1/Cs = (1/C1) + (1/C2)

Simplifying this, we have;

Cs = (C1*C2)/(C1 + C2)

Plugging in the relevant values ;

Cs = (1.51 × 10^(-10)*0.691 × 10^(-10))/((1.51 × 10^(-10)) + (0.691 × 10^(-10)))

Cs = 0.474 × 10^(-10) F

The formula for energy stored in a capacitor with 2 Dielectrics is given as;

U = ½Cs*V²

So,

U = ½ × 0.474 × 10^(-10) × 96²

U = 2.18 × 10^(-7) J = 218 × 10^(-9) = 218 nJ

8 0
3 years ago
A visible violet light emits light with a wavelength of 4.00 × 10-7 m.
RideAnS [48]

Answer:

The correct option is B. 7.5 * 10¹⁴ Hz

Explanation:

Frequency = (speed) / (wavelength)

= (3 x 10⁸ m/s) / (4 x 10⁻⁷ m)

= (3/4 x 10¹⁵) ( m / m - s )

= (0.75 x 10¹⁵) /sec

= 7.5 x 10¹⁴ Hz

= 750,000 GHz

4 0
2 years ago
Read 2 more answers
Other questions:
  • Six automobiles are initially traveling at the indicated velocities. The automobiles have different masses and velocities. The d
    10·2 answers
  • This is an electrical device that changes the voltage of electricity through the use of two set of coils
    12·2 answers
  • How to find a planet’s gravitational field strength using its radius?
    6·1 answer
  • We want to get a better, more concrete idea of the strength of the electric force. So imagine you could remove all the electrons
    6·2 answers
  • A stunt woman attempts to swing from the roof of a m 24 high building to the bottom of an identical building using a m 24 rope,
    12·1 answer
  • Would you expect the density of graphite and diamond to be the same
    7·1 answer
  • An echo is not heard in a small room.why ? give reason<br>​
    8·2 answers
  • Students want to investigate the inverse relationship between the pressure and temperature of an ideal gas as predicted by the i
    5·1 answer
  • When an object slides,there is less friction than when it rolls
    15·1 answer
  • What does Atomic Collisions mean
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!