help me to answer this please ​

Answer:Since most of air is made of nitrogen and oxygen, which have heavier molecular weights than hydrogen, air is denser than the hydrogen-filled balloon (the atmosphere is denser than the hydrogen-filled balloon). This results in the balloon floating in the air!

Explanation:

Answer:

F = 810 [N]

Explanation:

To solve this problem we must use the acceleration of gravity of the moon, which according to information provided by the internet we can see that the gravitational acceleration corresponds to 1.62 [m/s^2].

The weight of a body corresponds to the product of mass by gravity, so with the following equation we can find the weight.

F =m*g

F = 500 * 1.62

F = 810 [N]

Answer:

valence electron are exposed to nucleus of other atom,

Answer:

Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion.

Explanation:

Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures.

Hope this helps :)

Answer:

when they have the same slope

Answer:

4.45×10¯⁷ N

Explanation:

The following data were obtained from the question:

Mass 1 (M₁) = 600 Kg

Mass 2 (M₂) = 400 Kg

Gravitational constant (G) = 6.67×10¯¹¹ Nm²Kg¯²

Sperating distance (r) = 6 m

Force (F) =.?

The gravitational force can be obtained as follow:

F = GM₁M₂ / r²

F = 6.67×10¯¹¹ × 600 × 400 / 6²

F = 1.6008×10¯⁵ / 36

F = 4.45×10¯⁷ N

Therefore, the gravitational force is 4.45×10¯⁷ N

Answer:

10 m/s

Explanation:

Find the displacement.

xf - xi = d

0 - (-10) = 10 m

Find the acceleration.

d = 1/2at^2

10 = 1/2a(2)^2

10 = 1/2a(4)

10 = 2a

a = 5 m/s^2

Find the velocity.

v = at

v = 5(2)

v = 10 m/s

Answer:

d = 11.77 m

Explanation:

Given that,

A ball is droped off the side of a bridge after 1.55 seconds.

We need to find how far it has fallen.

It will fall under the action of gravity. It would mean that a = g = 9.8 m/s²

Let it is fallen at a distance d. d can be calculated using second equation of motion as follows :

[tex]d=ut+\dfrac{1}{2}at^2[/tex]

Put u = 0 and a = g

So,

[tex]d=\dfrac{1}{2}\times 9.8\times (1.55)^2\\\\d=11.77\ m[/tex]

Hence, it will fall at a distance of 11.77 m.

Answer:

-11.77!!!! DONNT FORGET NEGATIVE

Explanation:

Answer:

The mass of the box is 24.97 [kg]

Explanation:

In order to solve this problem, we must use the concept of potential energy, which is defined as the product of mass by gravity by height. So we have the following equation.

[tex]E_{p} =m*g*h[/tex]

where:

Ep = potential energy [J]

m = mass [kg]

g = gravity acceleration = 9.81 [m/s^2]

h = elevation = 32 [m]

7840 = m*9.81*32

m = 24.97 [kg]

Answer:

This question lacks options, the options are:

A.The density of each block.

B.The electrical conductivity of each block.

C.The melting point of each block.

D.The volume of each block

The answer is D. Volume of each block

Explanation:

According to this question, Sonia has three blocks of different sizes. She then made observations and measurements of each block. The physical property of a substance that depends on the size of that substance is called EXTENSIVE PROPERTIES. This include mass, height, volume, length etc.

In this case, the different measurement Sonia will record on each copper block will be the VOLUME OF EACH BLOCK. This is because the volume depends on the size of the block (extensive), hence, will have different volume measurements.

Answer:

The initial energy emission occurs by 80% or more in the form of gamma rays but these are quickly absorbed and dispersed mostly by air in little more than a microsecond, converting gamma radiation into thermal radiation (thermal pulse ) and kinetic energy (shock wave) which are actually the two dominant effects in the initial moments of the explosion. The rest of the energy is released in the form of delayed radiation (fallout or fallout) and is not always counted when measuring the performance of the explosion.

Explanation:

High altitude explosions produce greater damage and extreme radiation flux due to lower air density (photons encounter less opposition) and consequently a higher blast wave is generated.

Answer:

Explanation:

You can plot their change in position per unit of time. By taking the slope of this graph, you can figure out the velocity at any point

Answer:

(a). The speed of the airplane is 78.53 m/s.

(b). The centripetal acceleration 1.234 m/s².

Explanation:

Given that,

Radius = 5000 m

Time = 400 second

We need to calculate the speed of the airplane

Using formula of speed

[tex]v=\dfrac{d}{t}[/tex]

[tex]v= \dfrac{2\pi r}{t}[/tex]

Put the value into the formula

[tex]v=\dfrac{2\times\pi\times5000}{400}[/tex]

[tex]v=78.53\ m/s[/tex]

We need to calculate the centripetal acceleration

Using formula formula

[tex]a=\dfrac{v^2}{r}[/tex]

Put the value into the formula

[tex]a=\dfrac{78.53^2}{5000}[/tex]

[tex]a=1.234\ m/s^2[/tex]

Hence, (a). The speed of the airplane is 78.53 m/s.

(b). The centripetal acceleration 1.234 m/s².

Answer:

find out the le

Explanation:

Answer:

as businesses became aware of the demand for equal access, they began t invest in research and development to meet the desires of their costumers.

Explanation:

just took the test, still failing :D

The rock fell as far as 78.4 meters.

Given the following data:

We know that the acceleration due to gravity (a) for an object is equal to 9.8 meter per seconds square.

To find how far (distance) has the rock fallen, we would use the third equation of motion;

[tex]V^2 = U^2 + 2aS[/tex]

Where:

Substituting the given parameters into the formula, we have;

[tex]39.2^2 = 0^2 + 2(9.8)S\\\\1536.64 = 0 + 19.6S\\\\19.6S = 1536.64\\\\S = \frac{1536.64}{19.6}[/tex]

Distance, S = 78.4 meters.

Therefore, the rock fell as far as 78.4 meters.

Read more: https://brainly.com/question/8898885

Answer:

3.9kg

Explanation:

From newton's second law of motion

F =ma

a = 10m/s^2

F=39N

a= F/m

a= 39/10

a= 3.9m/s^2

Answer: A

Explanation:

The speed of the spaceship  moving around a planet only by the gravitational force  is 7.12 × 10³ m/s.

A fictitious force that moves in a circle and is directed away from the center of the circle is called centrifugal force. When measurements are taken in an inertial frame of reference, the force does not exist. It only becomes relevant when we switch from a ground/inertial reference frame to a rotating reference frame.

The centrifugal force's unit is newton.

As the gravitational force is balanced by centrifugal force is orbital motion:

Gravitational force =centrifugal force

GMm/r² = mv²/r

v² = GM/r

v = √( GM/r)

= √(6.67×10⁻¹¹ ×4.76  ×10²⁶/6.27 ×10⁸)

= 7.12 × 10³ m/s.

Hence, The speed of the spaceship  is 7.12 × 10³ m/s. Hence, option (A) is correct.

Learn more about centrifugal force here:

https://brainly.com/question/17167298

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Explanation:

i think the answer is displacement

Answer:

it is friction

Explanation:

Answer:

The average speed is 5.8 m/s

Explanation:

I just did it