21. Which object would most likely be made of a material that is a thermal conductor?

What is an Ion and what does it do? (as much detail as you can put it into please)

user100 [1]

Answer:

Explanation:

Ions are substances the have lost or gained a certain amount of electrons. This makes them either positively or negatively charged.

They are charged particles.

Every atom is made up of protons, neutrons and electrons.
They are the three fundamental particles in any atom
The protons and neutrons are located in the central part called the nucleus of an atom. It is a simple tiny space.
Protons are positively charged particles. Neutrons do not carry any charges. Therefore, the nucleus is negatively charged.
Electrons are negatively charged particles. They occupy the bulk volume of an atom.

Every atom is neutral and the number of protons and electrons are the same. The equal number of protons and electrons balances to attain neutrality of an atom.

Electrons are very easy to lose since they occupy the outermost shell.

When an atom loses an electron, the number of protons is more than electrons. Therefore, it becomes positively charged. Hence, its is called an anion.
An atom can also gain an electron, the electron number will be more than the protons. They then become negatively charged and are called cation.

Cations and ions are substances that are produced to attain a special type of bonding called electrovalent bonding.

Oppositely charged substances attracts one another.

5 0

3 years ago

Car B has the same mass as Car A but is going twice as fast. If the same constant force brings both cars to a stop, how far will

evablogger [386]

Answer:four times

Explanation:

Given

mass of both cars A and B are same suppose m

but velocity of car B is same as of car A

Suppose velocity of car A is u

Velocity of car B is 2 u

A constant force is applied on both the cars such that they come to rest by travelling certain distance

using to find the distance traveled

where, v=final velocity

u=initial velocity

a=acceleration(offered by force)

s=displacement

final velocity is zero

For car A

$0-(u)^2=2\times a\times s$

$s_a=\frac{u^2}{2a}------1$

For car B

$0-(2u)^2=2\times a\times s_b$

$s_b=\frac{4u^2}{2a}----2$

divide 1 and 2 we get

$\frac{s_a}{s_b}=\frac{1}{4}$

thus $s_b=4\cdot s_a$

distance traveled by car B is four time of car A

7 0

3 years ago

g An arrow is shot straight up in the air at an initial speed of 15.5 m/s. After how much time is the arrow moving downward at a

Sati [7]

Answer:

2.11 seconds

Explanation:

We use the kinematic equation for the velocity in a constantly accelerated motion under the acceleration of gravity (g):

$v_f=v_i-g*t\\-5.2 = 15.5 - 9.8\,t\\9.8 \,t= 15.5 + 5.2\\t = 20.7/9.8\\t = 2.11 \,\,sec$

5 0

3 years ago

A fan is to accelerate quiescent air to a velocity of 8 m/s at a rate of 9 m3 /s. determine the minimum power that must be suppl

ELEN [110]

Given:
ρ = 1.18 kg/m³, density of air
v = 8 m/s, flow velocity
Q = 9 m³/s, volumetric flow rate

The minimum power required (at 100% efficiency) is
$\frac{1}{2} (8 \, \frac{m}{s} )^{2}*(9 \, \frac{m^{3}}{s} )*(1.18 \, \frac{kg}{m^{3}}) = 339.84 \, W$

The actual power will be higher because 100% efficiency is not possible.

Answer: 339.8 W (nearest tenth)

8 0

4 years ago

A car having a total mass of 2250 kg and traveling at 72.0 km/h smashes into a tree. The car is stopped in 0.250 s. The average

musickatia [10]

Answer:

A. 1.8x10⁵

Explanation:

For this question we have

72km/h = speed

Total mass = 2250kg

Stopped at t = 0.2250s

To get average force acting on this car on collision:

72km/3.6 = 20m|s

Impulse = ∆p

This implies:

F∆t = m∆v

F = m∆v/∆t

= 2250x20/0.250

= 180000

= 1.8x10⁵

Therefore option A is correct.

4 0

3 years ago