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3 years ago

Which term describes a substance that has a low melting point and poor electrical conductivity?

Physics

1 answer:

densk [106]3 years ago

4 0

Answer:Simple Covalent substance

Explanation:Simple covalent substance describes a substance that has a low melting point and poor electrical conductivity because:

(1)melting point :For the covalent bond and intermolecular force that are present in a simple covalent substance,energy is needed to break the forces of attraction present. In the simple covalent substance, little energy is needed because the intermolecular forces present are broken because they are weaker compared to the covalent bond present.

Therefore, when simple covalent substance melts,only the intermolecular forces are broken leaving only the covalent bond in the substance.

(2) poor conductivity: for a substance to conduct electricity,it must have charged particles which are free to move to and fro.

But in the simple covalent substance,there are no charged particles that can be separated due to the covalent bond present in simple covalent substance.

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28. (a) A daredevil is attempting to jump his motorcycle over a line of buses parked end to end by driving up a 32° ramp at a sp

Ad libitum [116K]

Answer:

a) # buses = 7

Explanation:

For this exercise we use the kinematic equations, let's find the time it takes to reach the same height

y = $v_{oy}$ t - ½ g t²

Let's decompose the speed, with trigonometry

v₀ₓ = v₀ cos θ

$v_{oy}$ = v₀ sin θ

v₀ₓ = 40 cos 32

v₀ₓ = 33.9 m / s

$v_{oy}$ = 40 sin32

$v_{oy}$ = 21.2 m / s

When it arrives it is at the same initial height y = 0

0 = ( $v_{oy}$ - ½ gt) t

That has two solutions

t = 0 when it comes out

t = 2 $v_{oy}$ / g when it arrives

t = 2 21.2 /9.8

t = 4,326 s

We use the horizontal displacement equation

x = vox t

x = 33.9 4.326

x = 146.7 m

To find the number of buses we can use a direct proportions rule

# buses = 146.7 / 20

# buses = 7.3

# buses = 7

The distance of the seven buses is

L = 20 * 7 = 140 m

b) let's look for the scope for this jump

R = vo2 sin2T / g

R = 40 2 without 2 32 /9.8

R = 146.7 m

As we can see the range and distance needed to pass the seven (7) buses is different there is a margin of error of 6.7 m in favor of the jumper (security)

7 0

3 years ago

A pendulum has 141 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom o

Lubov Fominskaja [6]

Assume that energy losses (due to aerodynamic resistance or bearing friction are negligible).

At the highest point, the pendulum has its maximum potential energy (PE) and zero kinetic energy (KE). The total energy is equal to the PE = 141 J.

At the lowest point, the pendulum has its maximum KE, and zero PE. The total energy is equal to the KE.

Because energy is preserved, therefore
KE at the lowest point = PE at the highest point = 141 J.

Answer: 141 J

3 0

3 years ago

What type of image is formed by a lens if m = -1.6?

anastassius [24]

The image formed from the lens is real, inverted and enlarged

Explanation:

The magnification of a lens is given by:

$m=\frac{y'}{y}=-\frac{q}{p}$ (1)

where:

y' is the size of the image

y is the size of the object

q is the distance of the image from the lens

p is the distance of the object from the lens

For this lens, the magnification is

m = -1.6

We notice the following:

- The magnification is negative

- The magnification is larger than 1

Looking at eq.(1), we can therefore make the following conclusions:

- SInce $m=\frac{y'}{y}$ and $|m|>1$ , it follows that $|y'|>|y|$ , so the image is larger than the object

- Since $m=\frac{y'}{y}$ and $m$ , it follows that $y'$ (since y > 0 for convention): this means that the image is inverted

- Since $m=-\frac{q}{p}$ and $m$ , it follows that $q>0$ (since p > 0 for convention): this means that the image is real

Learn more about lenses and mirrors here:

brainly.com/question/8737441

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3 years ago

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The student in item 1 moves the box up a ramp inclined at 12 degrees with the horizontal. If the box starts from rest at the bot

Alik [6]

Answer:

Acceleration up the ramp = -2.745 m/ $s^{2}$

Explanation:

Given

box is pulled at angle Θ = $25^{o}$

Force applied F = 185N

coefficient of friction, μ $_{k}$ = 0.27

mass of the box m = 35 kg

We know that,

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

horizontal component $F_{x}$ = F cosΘ = 185 * cos $25^{o}$ =167.67

vertical component $F_{y}$ = F sinΘ =185*sin $25^{o}$ = 78.18

Another vertical component is due to gravity $F_{g}$ , force in given by

$F_{g}$ = mg

= 35 x 9.8

= 343.35 N

Normal force $F_{n}$ = $F_{g}$ - $F_{y}$

= 343.35 - 78.18

= 265.17 N

Frictional force $F_{k}$ = $F_{n}$ * μ $_{k}$

= 265.17 * 0.27

= 71.596 N

To find acceleration, we know that,

force = mass x acceleration

acceleration = $\frac{force}{mass}$

Here force is the summation of frictional force and horizontal component of the applied force. These force act in opposite directions.

force = $F_{k}$ - $F_{x}$

= 71.596 - 167.67

= -96.074

acceleration = $\frac{-96.074}{35}$

= -2.745 m/ $s^{2}$

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3 years ago

What happens if you move a magnet near a coil of wire? A. Current is induced. B. Power is consumed. C. The coil becomes magnetiz

Sergio [31]

There is a voltage that appears between the ends of the wire. If the ends of the wire are connected, or there is a conductor between the both of them, then a current will flow in the wires. Hope it helps

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3 years ago

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