I need help. Is this right? ITS SO

Answer:

solution

given,

mass(m)=5040kg

kinetic energy(ke)=493,900

velocity(v)=?

[tex]ke = \frac{1}{2} mv {}^{2} \\ 493900 = \frac{1}{2} \times 5040 \times v {}^{2} \\ 493900 = \frac{5040v {}^{2} }{2} \\ 493900 = 2520v {}^{2} \\ v {}^{2} = 196 \\ v = \sqrt{196} \\ v = 14ms {}^{ - 1} [/tex]

When an object moves from one point to other point, it possess the energy which is called the Kinetic energy of the object.

The velocity of he bus is 14 m/s.

Given that, a bus travelling through town, with a mass of 5040 kg and kinetic energy of  493,900 J.

So the kinetic energy expressed by the formula given below.

[tex]k=\dfrac {1} {2}mv^2[/tex]

Where, [tex]k[/tex] is the kinetic energy in joules, [tex]m[/tex] is the mass of object in kilograms and [tex]v[/tex] is the velocity of the object in meter per second.

So the velocity of the bus can be calculated by substituting the values in above formula.

[tex]493900=\dfrac{1}{2}\times5040\times v^2[/tex]

[tex]v^2=196\\\\v=\sqrt{196}\\v=14\;\rm m/s[/tex]

The velocity of he bus is 14 m/s.

For more details, follow the link given below.

https://brainly.com/question/999862.

Answer:

Cheers

In physics, a force is any interaction that, when unopposed, will change the motion of an object.

[tex] \\ [/tex]

Answer:

The final equilibrium temperature is approximately 26.69 °C

Explanation:

The heat transferred, ΔQ, from a hot body to a cold one is given by the following formula;

ΔQ = m·c·ΔT

Where;

m = The mass of the body

c = The specific heat capacity of the body

ΔT = The temperature change of the body

The given mass of the gold bar, m₁ = 20.0 kg

The initial temperature of the gold bar, T₁ = 35.0 °C

The specific heat capacity of gold, c₁ = 0.13 kJ/(kg·K)

The mass of the glass container, m₂ = 0.8 kg

The initial temperature of the glass container, T₂ = 15°C

The specific heat capacity of glass, c₂ = 0.792 kJ/(kg·K)

The mass of the added water, m₃ = 2.0 kg

The initial temperature of the added water, T₃ = 25°C

The specific heat capacity of water, c₃ = 4.2 kJ/(kg·K)

The heat lost by the gold = The heat gained by the glass and the water

Let 'T' represent the temperature at the final equilibrium, we have;

m₁·c₁·ΔT₁ = m₂·c₂·ΔT₂ + m₃·c₃·ΔT₃

Where;

ΔT₁ = T₁ - T

ΔT₂ = T - T₂

ΔT₃ = T - T₃

∴ 20.0 × 0.13 × (35 - T) = 0.8 × 0.792 × (T - 15) + 2.0 × 4.2 × (T - 25)

Expanding and collecting like terms (using a graphing calculator) gives;

91 - 2.6·T = 9.0336·T - 219.504

9.0336·T + 2.6·T = 219.504 + 91 = 310.504

11.6336·T = 310.504

T = 310.504/11.6336 ≈ 26.69

The final equilibrium temperature, T ≈ 26.69 °C.

Answer:

29.9 m/s

Explanation:

answer on edumentum

Answer:

Because energy is conserved, the kinetic energy at the bottom of the first hill is the potential energy at the top of the hill, minus energy lost from friction:

KE = 416,500 J – 37,800 J = 378,700 J

To find the velocity of the car, plug the values for KE and m into the formula  and solve:

The roller coaster car has a velocity of about 29.9 meters/second at the bottom of the first hill.

Explanation:

edmentum

The answer is no. Hope this helps

Answer:

I believe it's D. a glacier flattening the land below it​.

Answer:

work is done on the air in the cylinder

Explanation:

when using air pump to compress air in a cylinder; Work is done on the air in the cylinder and its surroundings

work done = F* d

                  = Magnitude of force * displacement

This is what happens when an air pump is used to compress air into a cylinder

Answer:

442 Hz, 882 Hz, 1330 Hz

Explanation:

Given data:  length of the string= 0.31 m = 31 cm

speed of the waves = 274.4 M/s or 2740 cm/s

Wavelengths are

62 cm

31 cm and

62 / 3  =  20.67 cm

The frequencies associated with these wavelengths ( which are the 1st, 2nd and 3rd harmonics )

are

27440/ 62 =  442.6 = 442 Hz

27440/31  = 885.2  = 882 Hz

27440 / 20.67  = 1328 = 1330 Hz

Answer:

Ball B

Explanation:

I say this because its the heavier one?

The momentum of a body increases with increase in mass. Hence, among the two balls, the ball with the greater mass that is ball B has the greater momentum.

Momentum is the ability of a moving object to bring the force effective to make maximum displacement. It is the product of mass and velocity.

P = mv

Thus, as the velocity and mass increases, the momentum increases. The force applied on a body with greater mass makes greater acceleration and greater momentum.

Therefore, at constant velocity, the object with the greater mass will have the greater momentum. Then, the ball  with 75 kg mass is having  the greater momentum.

Find more on momentum:

https://brainly.com/question/24030570

#SPJ2

Answer:

A By returning nutrients to the soil

Explanation:

Here are the options

A By returning nutrients to the soil

B By releasing oxygen into the air

C By making space for new animals

D By decreasing the population of herbivores

The process by which mushrooms act on dead trees provide nutrients that are necessary for the process of photosynthesis.

Types of decomposers

Functions of a decomposer

Explanation:

The gravitational potential energy is given by :

P = mgh

The kinetic energy of an object is given by :

[tex]K=\dfrac{1}{2}mv^2[/tex]

As the ball reaches the bottom of the ramp, its potential energy decreases and kinetic energy increases.

It imply that, when the ball at the top most height, its gravitational potential energy is maximum and zero kinetic energy and when ball reaches the bottom of the ramp, it will have maximum kinetic energy and zero potential energy.

Answer:

 the mass deficit is directly proportional to bond reeling

Explanation:

The effect of the mass deficit in the nuclei is

          δ = m_nucleons - m_nucleo

the delta quantity is the binding energy of the atomic nucleus,

This mass is related to energy by the Einstein relation

         ΔE = c² Δm

therefore the mass deficit is directly proportional to bond reeling

Answer:

C. Some of the mass of the four hydrogen nuclei was converted into

energy

Explanation:

Ap3x

Answer:

A. Far away stars show a red shift and B. Microwave background creation is found all over the observational universe

Explanation:

Red shift in color indicates that galaxies are moving away from Earth. This is  proof that the Universe is continously expanding, which also supports the big bang theory.

The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools. Thus the universe should be filled with radiation that is literally the remnant heat left over from the Big Bang, called the “cosmic microwave background".

I hope this helps :)

Answer:

(c)Tension = 162 N

(d) Increase

Explanation:

(c)

In order for the cable to lift the plate at uniform velocity, the tension in the cable must be equal to the weight of the plate.

[tex]Tension = Weight = (Density)(Volume)\\Tension = (2.7\ x 10^3\ kg/m^3)(1\ m)(2\ m)(0.03\ m)\\[/tex]

Tension = 162 N

(d)

The tension with upward acceleration will become:

[tex]Tension = m(g+a)\\Tension = mg + ma\\Tension = Weight + ma\\[/tex]

Hence, the tension will increase by an amount equal to "ma".

Answer:

On a hot, dry day (or after several days with no rain or watering), transpiration causes more water to be lost than is coming in, and the water balance within the plant can get thrown off. The dehydrated collapsing cells in the leaves and stems can no longer remain erect, and the plant begins to wilt.

Explanation:

Answer:

3 m/s²

Explanation:

Acceleration = Change in velocity/ time

= (20 - 5) / 5

= 3 m/s²

solid state has the most intermolecular force of attraction.

Answer:

The option that best describes the relationship between frequency and wavelength of electromagnetic waves is the third option

c. The frequency increases as the wavelength decreases

Explanation:

The frequency of an electromagnetic wave, 'f', is given by the following formula;

[tex]Frequency, \, f = \dfrac{Wave \ Speed,v }{Wavelength, \ \lambda}[/tex]

From the above formula, the frequency of an electromagnetic wave is inversely proportional to the wavelength, and therefore, a higher frequency, ('f', to increase), requires a lower wavelength, (λ, decreases)

The correct option is that the frequency of an electromagnetic increases as the wavelength of the wave decrease.

Answer: D.

Explanation:

I just took a quiz im in highschool too and I got a 100

If you mix hot water and cold water in an isolated medium the mixture would have the temperature intermediate of the initial temperatures of the hot water and the cold water because of heat transfer.

How heat is transferred ?

To know more about heat transfer check this:

brainly.com/question/20083116

#SPJ2

Answer:

true

Explanation:

the explanation is we would have been roasted if they weren't to weak

Answer:  

Periods indicate that a new period at a new principal energy level which is filled with electrons. Groups indicate that the elements share similar properties because their shells are filled with the same number of valence electons.

Explanation:  

We see that starting at period 2 Li has a  +1 charge , He has +2 charge, B has +3 charge, C has the potential to have a +4 charge or -4 charge (because it can gain or loose electrons) and N has a -3 charge, etc. Groups however, have similar properties and every element in a 1A - 8A has the same number of valence electrons. All except the noble gases in which He only needs 2 electrons to be in a perfect state. This is its octet as it would be a completely different element if it had more than 2 electrons in its shell. An example of the groups sharing similar properties is if we were to look at group 1A. In group 1A we find H, Na, K, etc. These are all highly unstable elements when alone (not in a compound) and they are very reactive. If you were to put Na for instance in water, it would light up and you'd see a flame sitting on top of the water. A scientist could do that with the rest of the elements in the group and they would see this increasing in reactivity as you go down the periods. Francium isn't visible long enough to be able to see this happen though. It's more of that kind of element that scientists prove that it exists, but not a very common element to get to learn much about.

Answer:

Hello your question is incomplete hence I will give you a general answer on how A van de Graaff generator works

answer :

If the electrons falls through a PD of 150mV the electron will gain energy of   150MeV

Explanation:

when a Van de Graff generator is used to accelerate an electron through a PD ( potential difference ) of any value the particle ( electron )  the electron will gain energy  ( eV )  which is is equivalent in value of the PD it accelerated through

hence if the electrons falls through a PD of 150mV the electron will gain energy of   150MeV

Answer:

Fuerza = 0.0082 Newton

Explanation:

Dados los siguientes datos;

Velocidad inicial, u = 25 m/s

Velocidad final, v = 60 m/s

Tiempo, t = 60 segundos

Masa = 0,0014 kg

Para encontrar la fuerza que actúa sobre el objeto;

En primer lugar, determinaríamos la aceleración del objeto.

Aceleración = (v - u)/t

Aceleración = (60 - 25)/60

Aceleración = 35/60

Aceleración = 5.83 m/s²

A continuación, encontramos la fuerza;

Fuerza = masa * aceleración

Fuerza = 0.0014 * 5.83

Fuerza = 0.0082 Newton