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3 years ago

6

Help me to answer this pls

1 answer:

lidiya [134]3 years ago

3 0

Answer:

Fibreglass - Insulator
piece of paper - Insulator
copper - Conductor
Stone - Insulator
Aluminium - Conductor
plastic spoon - Insulator
Iron - Conductor
Wood - Insulator
Ruler - Conductor/Insulator
Plastic straw - Insulator
Glass - Insulator
Brass - Conductor
Gold - Conductor
Cotton bud - Insulator
Silver - Conductor

Explanation:

Conductors are substances that can conduct electricity/heat. Usually, metals are good conductors as they have free electrons — electrons that are loosely held by the nucleus and are free to travel across the surface<em>(they stay on the surface and are not free to <u>escape</u><u> </u><u>into the</u><u> </u><u>surrounding</u><u> </u></em><em><u>space</u></em><em>)</em><em>.</em>

These free electrons help in the conduction of heat/electricity. Hence, substances containing these free particles are conductors.

Insulators do not allow heat/electricity to flow through them. Mostly, they are made up of molecules that are held together by strong intermolecular forces<em>(eg: Plastic )</em>.

[Note#9: Metal rulers are conductors whereas wooden rulers are insulators so, "ruler" comes under the category of both insulator as well as conductor].

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The two conducting rails in the drawing are tilted upwards so they each make an angle of 30.0° with respect to the ground. The v

dolphi86 [110]

Answer:

The current flows through the rod is 14.9 A.

Explanation:

Given that,

Magnetic field = 0.045 T

Mass of aluminum rod = 0.19 kg

Length = 1.6 m

Angle = 30.0°

We need to calculate the force

Using resolving force

$F\cos\theta=mg\sin\theta$

$F=mg\tan\theta$

Put the value into the formula

$F=0.19\times9.8\times\tan30$

$F=1.075\ N$

We need to calculate the current flows through the rod

Using formula of magnetic force

$F=iLB$

$i=\dfrac{F}{LB}$

Put the value into the formula

$i=\dfrac{1.075}{1.6\times0.045}$

$i=14.9\ A$

Hence, The current flows through the rod is 14.9 A.

8 0

3 years ago

A baseball player hits a ball with a bat. At one moment the force exerted by the bat on the ball is 18,000 N. At that same momen

11111nata11111 [884]

Answer:

Less than 18000N

Explanation:

Given

$Force\ Exerted = 18000N$

This question will be answered using Newton's third law.

Understanding this law, it implies that reaction force is equal and opposite to the force exerted.

This implies that;

If the force exerted on the ball is 18000N

the force exerted is -18000N

So, the option that answers the question is less than 18000N because -18000N < 18000N

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3 years ago

The horizontal bar rises at a constant rate of three hundred mm/s causing peg P to ride in the quarter circular slot. When coord

SVETLANKA909090 [29]

Answer:

Explanation:

Given

Horizontal bar rises with 300 mm/s

Let us take the horizontal component of P be

$P_x=rcos\theta$

$P_y=rsin\theta$

where $\theta$ is angle made by horizontal bar with x axis

Velocity at y=150 mm

$150=300sin\theta$

thus $\theta =30^{\circ}$

position of $P_x=rcos\theta =300\cdot cos30=300\times \frac{\sqrt{3}}{2}$

$P_x=259.80 mm$

$P=259.80\hat{i}+150\hat{j}$

Velocity at this instant

$u_x=-rsin\theta =300\times sin30=-150 mm/s$

$u_y=rcos\theta =300\times cos30=259.80 mm/s$

4 0

3 years ago

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Marysya12 [62]

Answer:

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Explanation:

6 0

3 years ago

How fast would a 20 kg dog have to run, to reach a momentum of 120 kg x m/s? Include unit in your answer. Worth 40 points!

Ivahew [28]

Answer:

6 m/s

Explanation:

momentum= mass times velocity

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8 0

3 years ago

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