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Irina-Kira [14]
4 years ago
13

In metals, some electrons from the outer shells of atoms are shared with other atoms, with the result that electrons can freely

move from atom to atom through the material. Because of this, metals are Question 5 options: a) Good electrical insulators b) Good heat insulators c) Good electrical conductors d) Good heat conductors e) Both a and b f) Both c and d
Physics
1 answer:
Kazeer [188]4 years ago
4 0
<h2>Answer:Option F</h2>

Explanation:

Metals have few number of electrons in their valence shell.

The force with which the nucleus of the metal atom is pulling the electron towards itself is lower on the valence shell because the distance between the nucleus an valence shell is large.

So,there are a lot of free electrons in metals.

When the ends of metals are at different potential,electrons flow from one end to another to balance the potential.This feature of metals allows them to conduct electricity.

Similarly,when the ends of metals are at different temperatures,conduction will take place and electrons are the carriers of conduction.This feature of metals allows them to conduct heat.

So,metals are good conductors of heat and electricity.

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Suppose that the hatch on the side of a Mars lander is built and tested on Earth so that the internal pressure just balances the
Anika [276]

Answer:

F=19.8kN=4442lb

Explanation:

On Earth the atmospheric presure is P_E=101325 N/m^2. This will be the pressure inside the lander. Outside, the pressure on Mars will be P_M=650 N/m^2. This means that the net force will be outward (since inside the pressure is higher) and, since the area of the hatch is A=\pi r^2, of value:

F=(P_E-P_M)\pi r^2=(101325N/m^2-650N/m^2)\pi (\frac{0.5m}{2})^2=19768N=19.8kN

Since 1lb in weight  is equal to 4.45N, we can write:

F=19768N=19768N\frac{1lb}{4.45N}=4442lb

5 0
3 years ago
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Simora [160]
I only know what number 1. is and its Mechanical Energy.
8 0
3 years ago
What is true about surface waves?
fredd [130]
B. is the correct answer
6 0
4 years ago
Read 2 more answers
When a guitar is tuned to adjust it pitch what is it that is changed?
suter [353]

Answer:

B) Its frequency

Explanation:

  • <u>The pitch of sound heard depends on its frequency of the sound wave. Frequency refers to how fast the sound wave is oscillating. </u>
  • A high frequency sound wave has a high pitch while a low frequency sound wave has a low pitch.
  • The faster the sound wave oscillates the higher the pitch. For instance, a guitar with a big heavy string will vibrate slowly and thus create a low pitch.

3 0
3 years ago
A sandbag motionless in outer space is hit by a three-times-as massive sandbag moving at 12 m/s. They stick together. This is an
vekshin1

Answer:

This is an example of inelastic collision and it loses zero(0) % of initial kinetic energy

Explanation:

Let the mass of the motionless sandbag = m₁

Let the mass of the moving sandbag = m₂ = 3m₁

initial velocity of the motionless sandbag, u₁ = 0

initial velocity of the moving sandbag, u₂ = 12 m/s

Let their final velocity, = v

Collision between two particles can either be elastic or inelastic.

Since they stick together after the impact, then the collision is inelastic

Apply the principle of conservation of linear momentum;

Initial kinetic energy = final kinetic energy

¹/₂m₁u₁² + ¹/₂m₂u₂² = ¹/₂v²(m₁ + m₂)

¹/₂m₁(0)² + ¹/₂(3m₁)(12)² = ¹/₂v²(m₁+3m₁)

216m₁ = 2m₁ v²

v² = 108

v = √108

v = 10.392 m/s

Change in kinetic energy = Final kinetic energy - initial kinetic energy

Initial Kinetic energy, KE₁ = ¹/₂m₁u₁² + ¹/₂m₂u₂²

                                   KE₁ = ¹/₂m₁(0)² + ¹/₂(3m₁)(12)²

                                   KE₁ = 216m₁ J

Final kinetic energy, KE₂ = ¹/₂v²(m₁ + m₂)

                                  KE₂ = ¹/₂(108)(m₁ + 3m₁)

                                  KE₂ = 216m₁ J

ΔKE = KE₂ - KE₁ =  216m₁ J -  216m₁ J = 0%

Therefore, this is an example of inelastic collision and it loses zero(0) % of initial kinetic energy

4 0
3 years ago
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