Un mobil parcurge distanta dintre 2 localitati in 2 etape: in prima etapa parcurge d1+40km cu viteza v1=50km/h, apoi parcurge d2=60km cu v2=60km/h. Care este v medie?

Answer:

The red substance was ionic. The white substance was molecular.

Explanation:

B.C.

If Clarisse had three substances, A white substance was waxy and malleable. A red crystal was translucent, and it cracked when she hit it with a hammer. A silver substance could be flattened by hitting it with a hammer, but it did not crack. the two true statements are the red substance was ionic and the white substance was molecular. therefore the correct option is B and D.

The chemical compound is a combination of two or more either similar or dissimilar chemical elements, for example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom.

These chemical compounds are formed because of different types of bonds between the constituent's elements, the chemical bonds are mainly ionic bonds, covalent bonds,s, and hydrogen bonds.

Ionic bonds are formed due to the transfer of electrons between two bond-forming pairs differentiated by their electronegativity.

Covalent bonds are formed by the sharing of electrons. Generally, organic compounds are formed as the reason for covalent bonds.

As the white substance is waxy and malleable and the silvers substance could be flattened by hitting with a hammer but it did not crack it means the white substance is a metallic material that is molecular in nature , the red crystal is translucent and cracked when hit with a hammer this means it is ionic in nature.

Thus, the correct options are option B and option D.

Learn more about a chemical compound from here

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Answer:

cant see to find the answer sorry :( i tried :( good luck !! youll do great <333

Explanation:

sorry ;( best of luck

Answer:

2.66secs

Explanation:

To get the time it will take to reach the ground, we will use the equation of motion;

S = ut + 1/2at²

S is the distance

u is the initial velocity

g is the acceleration due to gravity

Given

S = 30m

u = 0m/s

Let's get the acceleration

According to newton's second law;

[tex]\F_x = ma_x\\F_m - F_f = ma_x\\mgsin \theta - 0 = ma_x\\gsin\theta = a_x\\a_x = 9.8sin 60\\a_x = 9.8(0.8660)\\a_x = 8.49m/s^2[/tex]

Get the required time:

Recall that: S = ut + 1/2at²

Substitute the given parameters and find t

30 = 0(t) + 1/2(8.49)t²

30 = 4.24t²

t² = 30/4.24

t² = 7.08

t = √7.08

t = 2.66secs

Hence it take the box 2.66seconds to reach the ground

Answer:

58.8m

Explanation:

Answer:

because the density of iron nail is more tha n density of water but the density of ship made iron steel is less than the density of water

Answer:

v = 98.1 m/s

Explanation:

We will apply the law of conservation of energy here, between peak A and peak B.

Total Energy of Ball at A = Total Energy of Ball at B

[tex]K.E_{A}+P.E_{A}=K.E_{B}+P.E_{B}\\where,\\K.E_{A} = Kinetic\ Energy\ of\ ball\ at\ Peak\ A = \frac{1}{2}mv^{2} \\K.E_{B} = Kinetic\ Energy\ of\ ball\ at\ Peak\ B = \frac{1}{2}m(0)^{2} = 0\ J (since, ball\ stops\ at\ last) \\[/tex]

[tex]P.E_{A} = Potential\ Energy\ of\ ball\ at\ Peak\ A = mgh_{A}\\P.E_{B} = Potential\ Energy\ of\ ball\ at\ Peak\ B = mgh_{B}[/tex]

[tex]\frac{1}{2}mv^{2} + mgh_{A} = 0\ J + mgh_{B}\\m(\frac{1}{2}v^{2} + gh_{A}) = mgh_{B}\\v = \sqrt{2g(h_{B}-h_{A})}\\where,\\h_{A} = height\ pf\ peak\ A = 5\ m\\h_{B} = height\ pf\ peak\ B = 10\ m\\v = \sqrt{2(9.81\ m/s^{2})(10\ m-5\ m)}\\[/tex]

v = 98.1 m/s

Answer:

Acceleration does not affect mass. Acceleration only affects weight.

Explanation:

Your mass is the same on Earth compared to on the moon, but your weight is going to be different because the acceleration due to gravity is going to be different.

Answer:

18 m

Explanation:

G = Gravitational constant

m = Mass of planet = [tex]\rho V[/tex]

[tex]\rho[/tex] = Density of planet

V = Volume of planet assuming it is a sphere = [tex]\dfrac{4}{3}\pi r^3[/tex]

r = Radius of planet

Acceleration due to gravity on a planet is given by

[tex]g=\dfrac{Gm}{r^2}\\\Rightarrow g=\dfrac{G\rho V}{r^2}\\\Rightarrow g=\dfrac{G\rho \dfrac{4}{3}\pi r^3}{r^2}\\\Rightarrow g=\dfrac{4G\rho\pi r}{3}[/tex]

So,

[tex]g\propto \rho r[/tex]

Density of other planet = [tex]\rho_p=\dfrac{1}{4}\rho_e[/tex]

Radius of other planet = [tex]r_p=\dfrac{1}{3}r_e[/tex]

[tex]\dfrac{g_e}{g_p}=\dfrac{\rho_e r_e}{\rho_p r_p}\\\Rightarrow \dfrac{g_e}{g_p}=\dfrac{\rho_e r_e}{\dfrac{1}{4}\rho_e\times \dfrac{1}{3}r_e}\\\Rightarrow \dfrac{g_e}{g_p}=12\\\Rightarrow g_p=\dfrac{g_e}{12}\\\Rightarrow g_p=\dfrac{9.8}{12}[/tex]

Since the person is jumping up the acceleration due to gravity will be negative.

From kinematic equations we have

[tex]v^2-u^2=2g_es\\\Rightarrow u^2=v^2-2g_es\\\Rightarrow u^2=0-2\times -9.8\times 1.5\\\Rightarrow u^2=2\times 9.8\times 1.5[/tex]

On the other planet

[tex]v^2-u^2=2g_ps\\\Rightarrow s=\dfrac{v^2-u^2}{2g_p}\\\Rightarrow s=\dfrac{0-(2\times 9.8\times 1.5)}{2\times -\dfrac{9.8}{12}}\\\Rightarrow s=18\ \text{m}[/tex]

The man can jump a height of 18 m on the other planet.

Answer:

Hi... Your answer is impulse

Answer:

follow me for the answer

Answer:

The two types of biogenous sediments are calcareous ooze and siliceous ooze

Explanation:

Answer:

By putting something like a sheet of glass in the water.

Explanation:

Putting a sheet of glass in the water will make the ripples move slower because the speed of a wave depends on the depth of water.

Answer:

2/3.or 0,67

Explanation:

acceleration = Result or sum of force / the mass

a = F/m

a = (35-25)/15

a = 10/15 = 2/3 m/s²

a = 0,67 m/s²

Answer:

1.318m

Explanation:

The set up is a right angled triangle

Horizontal distance is the distance covered by the hurdler = 0.535m =adjacent

Angle of elevation = 67.9°

Height of the hurdler = opposite

Using the SOH CAH TOA identity

Using the TOA identity

Tan67.9° = opp/adj

Tan67.9 = opp/0.535

Opp = 0.535tan67.9°

Opp = 1.318m

Hence the required height is 1.318m

Answer:

Cold air from the house is moved through pipes, where it absorbs thermal energy.

Explanation:

Answer:

Like your refrigerator, heat pumps use electricity to move heat from a cool space to a warm space, making the cool space cooler and the warm space warmer. ... The most common type of heat pump is the air-source heat pump, which transfers heat between your house and the outside air.

Is this helpful

Answer:

See the answers below.

Explanation:

In order to solve this problem we must use the principle of conservation of momentum and the amount of movement. Where the car moves to the left with a negative speed sign while the force of the collision will be taken to the right.

[tex]-m_{car}*v_{car1}+(F*t)=m_{car}*v_{car2}[/tex]

where:

Vcar1 = velocity of the car before the collision = - 15 [m/s]

F = impact force [N]

Vcar2 = velocity of the car after the collision = 2.6 [m/s]

[tex]-(1500*15)+(F*t)=(2.6*1500)\\F*t=22500+3900\\F*t=26400[kg*m/s][/tex]

Where the product of force by Time is equal to the impulse caused by the collision.

[tex]And the force\\F = P/t\\F=26400/0.15\\F=176000[N][/tex]

Answer:

velocity

Explanation:

Velocity represents the direction of an object with a specified speed

Answer:

E∝A²

Energy varies as square of change in amplitude

If amplitude of 1 has energy of 2

Amplitude of 2 (double of 1) = (2x2)=4x2=8  4 times the energy at amplitude of 1.

For 8 units of amplitude change

8x8=64x2= 128  or C:

Explanation:

When the amplitude of the wave is 8 units, the corresponding energy of the wave is 128 units.

The given parameters;

The energy of a string at  a given amplitude is calculated as follows;

[tex]E = \frac{1}{2} kA^2\\\\\frac{E}{A^2} = \frac{E_1}{A_1^2}[/tex]

When the amplitude is 8, the energy of the wave is calculated as follows;

[tex]\frac{2}{1^2} = \frac{E_2}{8^2} \\\\E_2 = 2(8^2)\\\\E_2 = 2(64)\\\\E_2 = 128 \ units[/tex]

Thus, when the amplitude of the wave is 8 units, the corresponding energy of the wave is 128 units.

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Answer:

1. result

2.strengths

3. power

4. target heartbeat

5. visualize it

6. mindfulness

7. effort and practice

tried my best not sure if #3 #5 and #7 is correct but I tried. How is it?

Answer:

i think its....A

Explanation:

Answer:

A force is a push or a pull. It causes an object at rest to move. It can cause an object that is moving to change speed, or the distance covered over time. It can also change which way the object is moving its direction. Lastly, it can also cause an object to stop moving completely. A force has both magnitude and direction. An object with balance forces or a net force of zero will not change position.

Explanation:

Answer:

  about 4.74 seconds

Explanation:

The time to fall distance d from height h is given by ...

  t = √(2d/g)

  t = √(2·110 m/(9.8 m/s^2)) ≈ 4.74 s

It will take the car about 4.74 seconds to fall 110 meters to the river.

__

We assume the car's speed is horizontal, so does not add or subtract anything to/from the time to fall from the height.

Answer:

True

Explanation:

I just know.

Answer:

1.b 2.d 3.b 4.a 5.c

Explanation:

I tried my very best and I hoped these helped

Answer:

1. B

2.D

3.C

4.B

5.D

Explanation:

i'm not sure if these are correct but hope this helps

Answer:

Petroleum

Explanation:

Because Petroleum reservoirs can be depleted but something like wind energy wind will always be there

Answer: Petroleum

Explanation: Have a Good day!!

Answer:

the mechanical advantage is 10

Explanation:

The computation of the mechanical advantage is as follows:

Mechanical advantage is

= Load ÷ Effort

where,

The Loan is equivalent to the weight i.e. 500 lb

And, the effort is equivalent to the force applied  i.e. 50lb

So, the mechanical advantage is

= 500 ÷ 50

= 10

Hence, the mechanical advantage is 10

Answer:

dark-field microscopy

Explanation:

A darkfield microscope can be regarded as a brightfield microscope with a significant modification to condenser. There is an opaque disk, with a diameter of about 1cm placed in between the illuminator and condenser lens, the disk responsible for the blocking of most of the light from the illuminator, passing through the condenser to objective lens , which will then form hollow cone of light that has its focus on the specimen. Using a darkfield microscope the light that get to the objective is the only refracted or reflected light of structures in the specimen. And the image formed usually display a bright object with a dark background.

It should be noted that darkfield microscope is a type of microscopy works by allowing only light waves that have reflected from or refracted though the sample to enter the lens system.

Analyzing two-dimensional projectile motion is done by breaking it into two motions: along the horizontal and vertical axes.

hope it helps!!

Answer:

up and down

Explanation:

this is because they do have the correct flagellum to move to the left and to the right

Explanation:

if we take g=9.8m/s^2

F=mg

m=500

F=500×9.8=4900N

h=2

so w=mgh

w=4900×2

=9800j

Ultraviolet (UV) "light" is a type of electromagnetic radiation. UV light has a shorter wavelength than visible light. ... The wavelength of violet light is around 400 nanometers (or 4,000 Å). Ultraviolet radiation oscillates at rates between about 800 terahertz (THz or 1012 hertz) and 30,000 THz.

If you're starting at the lowest frequency that our eyes can see, you're at RED light.  

Then, as you hike through higher and higher frequencies, you travel through orange light, yellow light, green light, blue light, violet light.

Suddenly, as you keep going to higher frequency, you can't see the light any more. You've crossed the line from violet to ULTRAviolet. Now your eyes don't know it's there.  The frequency is too high. (Wavelength is too short.)