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3 years ago

To what extent do covalent compounds conduct electricity?

Physics

2 answers:

natita [175]3 years ago

3 0

Answer:

never

Explanation:

Olegator [25]3 years ago

3 0

Answer:

never....(D)

Explanation:

hope this helps, the person above me is also correct

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The physical structure of the earth’s rock is changed by _____.

PSYCHO15rus [73]

It could be stress or strain

4 0

4 years ago

Read 2 more answers

A 0.030 kg lead bullet hits a steel plate, both initially at 20?C. The bullet melts and splatters on impact. Assume that 80% of

Dmitry_Shevchenko [17]

Answer:

(a). The required is 1871.2 J.

(b). The speed the lead bullet is 395 m/s.

(c). The 20% of energy must have gone into collision between steel plate and bullet.

Explanation:

Given that,

Mass of bullet = 0.030 kg

Temperature = 20°C

(a). We need to heat required to increase the temperature of the lead bullet and melt it

Using formula of heat

$Q=mS\Delta T+mL$

Where, m = mass of lead bullet

S = specific heat

L = latent heat

T = Temperature

Put the value into the formula

$Q=0.030\times130\times(327.5-20)+0.030\times22400$

$Q=1871.2\ J$

The required is 1871.2 J.

(b). Assume that 80% of the bullet’s kinetic energy goes into increasing its temperature and then melting it

We need to calculate the energy

$Q=\dfrac{1871.2}{0.8}$

$Q=2339 J$

We need to calculate the speed the lead bullet

Using formula of speed

$K.E=Q$

$\dfrac{1}{2}mv^2=2339$

$v^2=\dfrac{2339\times2}{0.030}$

$v=\sqrt{\dfrac{2339\times2}{0.030}}$

$v=394.8 = 395\ m/s$

The speed the lead bullet is 395 m/s.

(c). The 20% of energy must have gone into collision between steel plate and bullet.

Hence, This is the required solution.

6 0

3 years ago

the graph below shows the motion of an object over a certain period of time. various intervals of time are depicted by letters.

MA_775_DIABLO [31]

Answer:

Options (C) and (F).

Explanation:

Constant speed of an object is represented by the flat segment (a line parallel to the x-axis) on the graph of velocity and time.

In other words, flat segments represents no change in the velocity with respect to the time.

From the graph attached,

Being flat segments, C and F will represent the constant speed.

Therefore, Options (C) and (F) will be the correct options.

8 0

3 years ago

A solid sphere is rolling on a surface. what fraction of its total kinetic energy is in the form of rotational kinetic energy ab

drek231 [11]

<span>Total KE = KE (rotational) + KE (translational) Moment of inertia of sphere is I = (2/5)mr^2 So KE (rotational) = (1/2) x I x w^2 = (1/2) x (2/5)mr^2 x w^2 = (1/5) x m x r^2 x w^2 KE (translational) = (1/2) x m x v^2 = (1/2) x m x (rw)^2 = (1/2) x m x r^2 x w^2 Hence KE = (1/5) x m x r^2 x w^2 + (1/2) x m x r^2 x w^2 = m x r^2 x w^2 ((1/5) + (1/2)) KE = (7/10) m x r^2 x w^2 Calculating the fraction of rotational kinetic energy to total kinetic energy, = rotational kinetic energy / total kinetic energy = (1/5) x m x r^2 x w^2 / (7/10) m x r^2 x w^2 = (1/5) / (7/10) = 2 / 7 The answer is 2 / 7</span>

7 0

3 years ago

Why a plastic pen which is rubbed with hair,is able to attract small pieces of papers

AURORKA [14]

Answer:

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5 0

3 years ago