Noah drops a rock with a density of 1.73 g/cm cubes into a pond. Will the rock float or sink? Explain your answer.

Answer:

Once used as a energy source they cannot be charged/used again.

Explanation:

Answer:

Explanation:

1 )

F = k q₁q₂ / r² where k = 9 x 10⁹

So force F₁ =  [tex]\frac{kq_1q_2}{(\frac{r}{2}+\frac{\sqrt{9} r}{2})^2 }[/tex]

= [tex]\frac{kq_1q_2}{(\frac{r}{2}+\frac{3 r}{2} )^2 }[/tex]

= k q₁q₂ /4 r²

F₁  =  F / 4

2 ) Electric field due to charge density σ

= σ / ε₀

So net electric field between the plates

=   ( σ₁ - σ₂ )  / ε₀

Force on charge  q

=  ( σ₁ - σ₂ ) q   / ε₀

work done = force x displacement

=  ( σ₁ - σ₂ ) x q x d   / ε₀

Answer:

The absolute pressure of the system is 12.7 psia.

Explanation:

Let suppose that system works at an atmospheric pressure of 14.7 psia, the absolute pressure is equal to the atmospheric pressure minus vaccum pressure, that is:

[tex]p_{abs} = p_{atm} - p_{vac}[/tex]

Where:

[tex]p_{abs}[/tex] - Absolute pressure, measured in pounds per square inch.

[tex]p_{atm}[/tex] - Atmospheric pressure, measured in pounds per square inch.

[tex]p_{vac}[/tex] - Vacuum pressure, measured in pounds per square inch.

Given that [tex]p_{atm} = 14.7\,psia[/tex] and [tex]p_{vac} = 2\,psia[/tex], the absolute pressure of the system is:

[tex]p_{abs} = 14.7\,psia-2\,psia[/tex]

[tex]p_{abs} = 12.7\,psia[/tex]

The absolute pressure of the system is 12.7 psia.

Answer:3000km/h

Explanation:

speed=distance/time

216,000km/72hrs

=3000km/h

Well, first of all, if there are astronauts aboard that ship, I hope they don't try to climb out yet.  If they pointed straight at the moon and covered 216,000 km so far, they still have another 168,000 km to go before they get there.

Average Speed = (distance) / (time)

Speed = (216,000 km) / (72 hours)

Average Speed = 3,000 km/hr

also

Speed = (216,000 km) x (1000m/km) / (72 hr x 3600sec/hr)

Average Speed = 833.33 m/s

There's not enough information given to find the ship's velocity.

Answer:

7.70

7.700

Explanation:

We can simply add zeros behind the significant figures and they would still be equivalent to 7.7

Answer:

Velocity (v) can be calculated via v = gt, where g represents the acceleration due to gravity and t represents time in free fall. Furthermore, the distance traveled by a falling object (d) is calculated via d = 0.5gt^2.

Answer:

There are 2.71x10⁴ wavelengths between the source and the screen.

Explanation:

The number of wavelengths (N) can be calculated as follows:

[tex] N = \frac{d_{g}}{\lambda_{g}} + \frac{d_{a}}{\lambda_{a}} [/tex]    

Where:

[tex]d_{g}[/tex]: is the distance in glass = 2.25 mm

[tex]d_{a}[/tex]: is the distance in air = 1.50 cm - 0.225 cm = 1.275 cm

[tex]\lambda_{g}[/tex]: is the wavelength in glass

[tex]\lambda_{a}[/tex]: is the wavelength in air = 620 nm

To find the wavelength in glass we need to use the following equation:

[tex] n_{g}*\lambda_{g} = n_{a}*\lambda_{a} [/tex]

Where:

[tex]n_{g}[/tex]: is the refraction index of glass = 1.80

[tex]n_{a}[/tex]: is the refraction index of air = 1

[tex] \lambda_{g} = \frac{\lambda_{a}}{n_{g}} = \frac{620 nm}{1.80} = 344.4 nm [/tex]

Hence, the number of wavelengths is:

[tex] N = \frac{d_{g}}{\lambda_{g}} + \frac{d_{a}}{\lambda_{a}} [/tex]

[tex] N = \frac{2.25 \cdot 10^{-3} m}{344.4 \cdot 10^{-9} m} + \frac{1.275 \cdot 10^{-2} m}{620 \cdot 10^{-9} m} [/tex]                                    

[tex] N = 2.71 \cdot 10^{4} [/tex]

Therefore, there are 2.71x10⁴ wavelengths between the source and the screen.

I hope it helps you!

Answer:

the answer is c

Explanation:

because if the force of gravity increases its not gonna change its weight it will just float

Answer:

B

Explanation:

Weight is the amount of force gravity is exerting on something, so if gravity's force increases, weight would increase as well

A free-falling object has a consrant force acting on it . . .  the force of gravity, or what technical experts refer to as its "weight".

Since the object has a constant force acting on it, it must constantly accelerate according to Newton's 2nd law of motion. The way this acceleration reveals itself, the object's speed is constantly increasing.

Since the object is speeding up as it falls, there are a few weird things that happen:

 --  It will fall 2 meters in less than double the time for 1 meter.

 --  It will fall 3 meters in less than triple the time for 1 meter.

 --  It will fall 4 meters in less than quadruple the time for 1 meter, and less than double the time for 2 meters.

 --  It will fall 1 meter near the bottom in less time than 1 meter near the top.

None of the choices exactly answers the question.

Choices ' a ' and ' d ' are false statements.

Choice-b is a true statement, but it isn't a "Yes".

Choice-c  is kind of confused, but is probably the one you should select.

Answer:

It is wrong to say that "a single object all alone is moving" simply because it goes against Newton's law of inertia.

Explanation:

From Newton's law of inertia, it states that: An object at rest or in constant motion will continue in it's present state unless it is acted upon by an external force.

Which means that a single object by itself cannot move anywhere unless it is acted upon by an external force..

Thus, it is wrong to say that "a single object all alone is moving" simply because it goes against Newton's law of inertia.

Answer:

2.A flowerpot falling from a balcony

Explanation:

Potential energy is the internal energy within a body at rest or at a height above the ground. In this case of the falling flowerpot, the flowerpot initially has a potential energy due to its position on the balcony above the surface of the earth. As the flowerpot falls, the work done against gravity in taking the flowerpot to this height on the balcony (equivalent to the potential energy) is transformed into the kinetic energy of motion as the flowerpot falls down through the height.

We have,

Speed = 8 m/s

Time = 17 seconds

Now,

Speed = Distance/Time

★ Substituting the values in the above formula,we get:

⇒ 8 = Distance/17

⇒ Distance = 8 × 17

⇒ Distance = 136 m

Hence,the distance covered by a whale is 136 m .

Answer:

288W.

Explanation:

P = IV = V^2 / R = (120)^2 / 50 = 288W.

Answer:

Ocean phytoplankton

Explanation:

The sea and ocean creates oxygen from the plants (sea creatures) that exist there. These plants generate oxygen when used as a-product of photosynthesis, a mechanism that transforms carbon dioxide through sunlight into carbohydrates that the body(plants) can use for nutrition.

Answer:

v = √2gh

v = 7 m / s

Explanation:

For this exercise we can use the law of conservation of energy

starting point. In the roof

         Em₀ = U = m g h

final point. On the floor

          Em_f = K = ½ m v²

as there is no friction, the energy is conserved

          Em₀ = Em_f

          m g h = ½ m v²

          v = √2gh

In the exercise the height of the ceiling is not indicated, but in general the height of the ceiling of a house is h = 2.5 m

         v = √ (2 9.8 2.5)

         v = 7 m / s

Answer:

I think they use it at night because they want to avoid involving themselves in road accident while crossing the street. When there are reflective strips on their clothes, drivers do notice them even at far ends of the street since the strips will reflect the rays from the car lights to the driver,hence, the driver notifies that there is a pedestrian crossing and therefore slows down.

Answer:

While centripetal force focuses towards the centre of a rotating path, the centrifugal force is just opposite to this, meaning it exerts a force to liberate a body from ...

Centripetal force is an inward force and centrifugal force is an outward force.

Centrifugal force is often referred to as inertial force or fictitious force.

More items...

Explanation:

Answer:

The prokaryotic cells are smaller than the eukaryotic cells.

Explanation:

Its just the simple process of elimination. Prokaryotic cells lack of a lot of things, including mitochondria, so it couldn't be option C. BOTH prokaryotic and eukaryotic cells have cytosol AND ribosomes, so the answer couldn't be D or A, and you're left with option B. Meaning option B is the correct choice.

Answer:

2 m/s^2

Explanation:

acceleration formula: a=(v-v0)/t

a=(24-12)/6=2

Answer:

It would be 2.2 if you have to round the five to the one but if your not rounding the number, it'd be 2.1.

Explanation:

Answer:

Acceleration,  [tex]767.08\ m/s^2[/tex]

Explanation:

Given that,

Height from a ball falls the ground, h = 17.3 m

It is in contact with the ground for 24.0 ms before stopping.

We need to find the average acceleration the ball during the time it is in contact with the ground.

Firstly, find the velocity when it reached the ground. So,

[tex]v^2=u^2+2ah[/tex]

u = initial velocity=0 m/s

a = acceleration=g

[tex]v=\sqrt{2gh} \\\\v=\sqrt{2\times 9.8\times 17.3} \\\\v=18.41\ m/s[/tex]

It is in negative direction, u = -18.41 m/s

Let a is average acceleration of the ball. Consider, v = and u = -18.41 m/s.

[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{0-18.41}{24\times 10^{-3}}\\\\a=767.08\ m/s^2[/tex]

So, the average acceleration of the ball during the time it is in contact is [tex]767.08\ m/s^2[/tex].

Answer:110

Explanation:

Answer: A decrease in acceleration causes the mass to increase.

Explanation:

Let's rewrite this as:

"For a constant force F, we can see that heavier objects accelerate less"

Then, as the mass increases, the acceleration of the object decreases.

This is known as an inverse relationship between acceleration and mass.

By second Newton's law we have that:

F = m*a

Force equals mass times acceleration.

So if the force is constant, we can write it as:

a = F/m.

In this equation, we can see that, if the acceleration decreases and F remains constant, then the mass m must increase (because it is in the denominator)

Then the correct option is:

A decrease in acceleration causes the mass to increase.

Answer:

There is a negative correlation between mass and acceleration.

Explanation:

Facundo is wrong. I got this wrong thanks to Facundo!

Answer:

Call a treatment service. Seek out a healthcare professional. Lastly, report the issue to the local authorities.

Why did I choose these?

You call the treatment services to take care of the person.

You seek out a healthcare professional to get him/her back in shape.

Then you report the issue so that nobody will be endangered by the person that is abusing alcohol. Many accidents occur because of this and that is why you report it.

Explanation:

Answer:

the light relflects off them and creates a image

Answer:

When photons - rays of light - coming from an object (your smiling face, for example) strike the smooth surface of a mirror, they bounce back at the same angle. Your eyes see these reflected photons as a mirror image.... If a smooth surface absorbs the photons, they can't bounce back and there will be no reflection.

Explanation:

*Hope this helps*

Answer:

Meter

Explanation:

The competition between the three quarterbacks is with respect to how far the ball would be thrown by each person, which is the distance covered by the ball. The thrown ball is an example of projectile, which would move over a certain distance.

With respect to the measure to be used in the competition, the appropriate SI unit is meter. This is the measure of length or distance covered.

Answer:In short yes in long

Explanation:yes all substances can exist in any of these three states. In addition to existing in one of the three states, matter can also undergo a change of state. A change of state occurs when matter is converted from one state to another state for example when a liquid is converted to a gas or a solid is converted to a liquid.

Maybe sea or onshore breeze

It develops due to the difference of air pressure greater by the different temperature of the water and land