An automobile travels on a straight road for 55 km at 20 km/h. It then continues in the same direction for another 60 km at 55 km/h. What is the average velocity (km/h) of the car during the full 115 km trip

Answer:

Work can transfer energy between objects and cause a change in the amount of total energy. Work can transfer energy between objects and cause a change in the form of energy. ... When a spring is compressed, the energy changes from kinetic to potential.

Answer:

I think its either A or B

Explanation:

Answer:

Physical science is the study of the inorganic world. That is, it does not study living things. (Those are studied in biological, or life, science.) The four main branches of physical science are astronomy, physics, chemistry, and the Earth sciences, which include meteorology and geology.

Explanation:

Answer:

x=-2 and y=3

Explanation:

Isolate y and then x to get: y=13+5(-2)

Simplify to get y=3 then plug it back in to get x=-2

We can check, 9+ (-4)=5 hope this helps

Answer:

The speed at the end of the track = 27 m/s

The acceleration = 1.2 m/s²

Please find the Δx vs Δt, v vs Δt, a  vs Δt

Explanation:

We have;

x = u·t + 1/2·a·t²

Where;

x = The distance = 300 m

u = The initial velocity = 0 m/s (Ball at rest)

t = The time taken = 22.4 s

Therefore;

300 = 0 + 1/2×a×22.4²

a = 2×300/22.4² = 1.19579 ≈ 1.2 m/s²

v = u + a×t

∴ v = 0 + 1.2 × 22.4 = 26.88 ≈ 27 m/s

Part of the table of values is as follows;

t,                                     x,                                          v

0,                                    0,                                        0

0.4,                                 0.095663,                         0.478316

0.8,                                 0.382653,                          0.956632

1.2,                                   0.860969,                         1.434948

1.6,                                   1.530611,                            1.913264

2,                                     2.39158,                              2.39158

2.4,                                  3.443875,                           2.869896

2.8,                                   4.687497,                          3.348212

3.2,                                   6.122445,                           3.826528

3.6,                                   7.748719,                             4.304844

Answer:

1.15×10⁶ J

Explanation:

Heat needed to bring the ice to 0°C:

q = mCΔT

q = (3 kg) (2100 J/kg/K) (0°C − (-2°C))

q = 12,600 J

Heat needed to melt the ice:

q = mL

q = (3 kg) (3.36×10⁵ J/kg)

q = 1,008,000 J

Heat needed to bring the water to 10°C:

q = mCΔT

q = (3 kg) (4200 J/kg/K) (10°C − 0°C)

q = 126,000 J

The total heat is:

q = 12,600 J + 1,008,000 J + 126,000 J

q = 1,146,600 J

q = 1.15×10⁶ J

Answer:

i. Subtract v₀² from both of the equation.

ii. Divide both side of the equation by 2

iii. Divide both side of the equation by (x – x₀)

a = (v² – v₀²) / 2(x – x₀)

Explanation:

v² = v₀² + 2a(x – x₀)

To solve for a in the expression above, do the following:

i. Subtract v₀² from both of the equation.

v² – v₀² = v₀² – v₀² + 2a(x – x₀)

v² – v₀² = 2a(x – x₀)

ii. Divide both side of the equation by 2

(v² – v₀²) /2= 2a(x – x₀)/2

(v² – v₀²) /2 = a(x – x₀)

iii. Divide both side of the equation by (x – x₀)

(v² – v₀²) /2 ÷ (x – x₀) = a(x – x₀)/(x – x₀)

(v² – v₀²) /2 × 1/ (x – x₀) = a

a = (v² – v₀²) / 2(x – x₀)

Answer:

"12.50 × 10⁹" pounds of hamburger. The further explanation is given below.

Explanation:

Sold hamburger

=  more than 50 billion

To get pounds of hamburger,

=  [tex]50 \ billion\times 0.125 \ lbs[/tex]

=  [tex]12.50 \ billion \ pounds[/tex]

=  [tex]12.50\times 10^9 \ lb[/tex]

On divide pounds of hamburgers by pounds of burger meat through one head of cattle, we get

⇒  [tex]\frac{12.5 \ billion}{350}[/tex]

⇒  [tex]35714285 \ cattle[/tex]

Answer:

d) atoms share electrons

Explanation:

Atoms with relatively similar electronegativities share electrons between them and are connected by covalent bond. Atoms with large differences in the electronicnegativity transfer electron's to form ions. The ions are then attracted to each other.

Answer:

D.

Explanation:

edge

Answer:

The answer would be 91.9 or 91.8635

Hope this helps

A driver sees a boy and his dog on the road, and it takes the driver 0.50 seconds to put on the brakes, If the car travels 14 meters during that time, the velocity of the car would have been 56 m/s,

There are three equations of motion given by  Newton

The first equation is given as follows

v = u + at

the second equation is given as follows

S = ut + 1/2×a×t²

the third equation is given as follows

v² - u² = 2×a×s

As given in the problem a driver sees a boy and his dog on the road, and it takes the driver 0.50 seconds to put on the brakes, If the car travels 14 meters during that time,

t = 0.5 s , s = 14 m

By using the first equation of the motion,

v = u+at

0 = u+a×0.5

a = -2u m/s²

Now by using the second equation of motion,

s = ut+1/2at²

By substituting t=0.5 and a = -2u m/s² in the equation ,

14 = u/2-u/4 = u/4

u = 56 m/s

Thus, the velocity of the car would have been 56 m/s,

Learn more about equations of motion from here,

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Answer:

The answer is "4".

Explanation:

The luminaire would be recessed inside a wall, so that, dependent on the surface mountings, its top-level is flush with the ceiling. It is the hanging under the primary structural, in which the drop was an area of the above falling ceiling, that referred to its full space, because it will be generally used for the HVAC air return and the total space is also used to obfuscate piping, cabling, and ducts, that's why the middle-to-middle spacing of curved lighting systems would have to be in incremental increases of 4 ft.

Answer:

Hey there!

No. Displacement is always less than or equal to the distance.

Let me know if this helps :)

Answer:

2.27kg

Explanation:

The Potential energy gained = Force gravity× Height

Force gravity on the ball is GPE/ height

56.8/2.5=22.72N

the mass = 22.72/10= 2.27kg

The mass of the ball when the gravitational potential energy of 56.8 J present is 2.27 kg.

The potential energy is the energy by virtue of its position in the effect of gravity.

Given is an exercise ball is on a table 2.5 m above the ground. It has a gravitational potential energy of 56.8 J.

Potential energy = gravity force × height

P.E =mgh

56.8 J = m x 9.8 x 2.5

m = 2.27kg

Thus, mass of the ball is 2.27 kg.

Learn more about gravitational potential energy.

https://brainly.com/question/3884855

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Explanation:

Newton's second law simply says that the net force on an object is equal to the object's mass times its acceleration.

∑F = ma

For example, think of a game of tug-of-war, in which two teams pull on a rope in opposite directions.

If the forces are equal (balanced), then the net force is 0 N, so Newton's second law tells us that the rope's acceleration is 0 m/s².

If the forces are not equal (unbalanced), then the net force is not 0 N, and the rope will accelerate in the direction of the net force.

Answer:

The correct answer is combustibility

Explanation:

A chemical property of a matter is a property in which a matter has the tendency to change its form through chemical reaction(s).

A matter is said to have combustibility property if it can undergo combustion. Combustion is a chemical process in which a substance burns in excess oxygen to produce carbon dioxide and water.

Consider the equation below

CH₄ + O₂ ⇒ CO₂ + H₂O

The equation above shows methane burning in excess oxygen to produce carbon dioxide and water

The answer is electrical conductivity!

Answer:

hi... I won't be able to give you a detailed explanation but here's as far as i know:

If you ask someone in galaxy 3 how galaxy 2 appears to move, they'd say that it seems to move away from them too.

Explanation:

Our universe is constantly expanding, right? But there is no central point in the whole expansion thing. A common example used to describe this is a balloon being blown up. Imagine there are little dots on the balloon. When the balloon is blow up, the dots seem to move away from each other but there isn't any one that stays where it is. So that's kind of like the universe.

Galaxy 3 will see galaxy 2 move away from it too.

I don't know a lot about this so please correct me if I'm wrong but... hope this helps.

Answer:

The electric field intensity of electric force is [tex]1.35\times10^{7}\ N/C[/tex]

Explanation:

Given that,

First charge [tex]q_{1}=15\times10^{-6}\ C[/tex]

Second charge [tex]q_{2}=150\times10^{-6}\ C[/tex]

Distance = 0.1 m

We need to calculate the electric field intensity of electric force

Using formula of intensity of electric force

[tex]E=\dfrac{F}{q_{2}}[/tex]

[tex]E=\dfrac{kq_{1}}{r^2}[/tex]

Put the value into the formula

[tex]E=\dfrac{9\times10^{9}\times15\times10^{-6}}{(0.1)^2}[/tex]

[tex]E=13500000\ N/C[/tex]

[tex]E=1.35\times10^{7}\ N/C[/tex]

Hence, The electric field intensity of electric force is [tex]1.35\times10^{7}\ N/C[/tex]

This question is asking for the speed of the skateboarder. speed= distance/time. In this question we will do 2/4 in order to get a speed of 0.5 mph.

Answer:

a = (v² − v₀²) / (2 (x − x₀))

Explanation:

v² = v₀² + 2a(x − x₀)

Subtract v₀² from both sides.

v² − v₀² = 2a(x − x₀)

Divide both sides by 2 (x − x₀).

(v² − v₀²) / (2 (x − x₀)) = a

Answer:

because speed is the modulus of velocity which is a vector

the velocity to be zero it must be a round trip

Explanation:

This is because speed is the modulus of velocity which is a vector.

For the velocity to be zero it must be a round trip, therefore the resulting vector zero

On the other hand, the speed of the module is the same in both directions

Answer:

16.74 m/s

Explanation:

From the question, the parameters given are:

Height h = 12.2 metres

Initial velocity U = 13.9 m/s

Time t = 1.58 s

The range or distance covered by the ball will be

R = u^2/g

Where g = 9.8 m/s^2

R = 13.9^2/9.8

R = 193.21/9.8

R = 19.72 m

Let first calculate the acceleration by using the formula below

R = Ut + 1/2at^2

Substitute all the parameters into the formula

19.72 = 13.9 × 1.58 - 1/2 × a × 1.58^2

19.72 = 21.962 - 1.2482a

Collect the like terms

-1.2482a = 19.72 - 21.962

- 1.2482a = - 2.242

a = 2.242/1.2482

a = 1.796 m/s^2

Using equation 1 to find the final speed

V = U + at

V = 13.9 + 1.796 × 1.58

V = 13.9 + 2.838

V = 16.74 m/s

Therefore, it hit the ground at speed 16.74 m/s

Answer:

The peak voltage is 473.86 V

Explanation:

Given;

number of turns of generator, N = 200  turn

diameter of the coil, d = 0.1 m

radius of the coil, r = 0.05 m

Magnitude of the magnetic field, B = 0.8 T

angular frequency, ω = 3600 rpm

angular frequency, ω (rad/s) = [tex]\frac{2\pi}{60} *3600\ rpm = 377.04 \ rad/s[/tex]

The peak voltage is given by;

E = NBAω

Where;

A is the area of the coil = πr² =  π (0.05)² = 7.855 x 10⁻³ m²

E = (200)(0.8)(7.855 x 10⁻³)(377.04)

E = 473.86 V

Therefore, the peak voltage is 473.86 V

Answer:

Rayon

Wool

Silk Yarn

Explanation:

Rayon

This is Fabric A. Rayon basically burns very quickly even quicker than fabrics like cotton and linen. Its ash is gray in color. The rayon fabric smells of burning paper when it is burnt.

Wool:

This is Fabric B. Wool is basically hard to ignite. It burns slowly. Its ash is dark in color. The wool fabric smells of burning hair when it is burnt.

Silk Yarn:

This is Fabric C. The silk yarn shrinks from the flame when it is burned. It has a grayish black ash. The silk yarn fabric smells burnt meat of  when it is burnt.

Answer: 50,400 J

Explanation:

Answer:

Explanation:

The expression given in the question which is

[tex]k= \frac{1}{2} mv^2[/tex]  

Is the expression for the kinetic energy stored in a system and it is measured in Joules

From the expression we can see that

mass m=210 kg

velocity v= 10.5 m/s

Substituting as seen in the question we have the kinetic energy as

[tex]k= \frac{1}{2}*210*10.5^2\\\\k= \frac{1}{2}*210*110.25\\\\k= \frac{1}{2} *23152.5\\\\k= 11577.25 J[/tex]

hence the energy stored is 11577.25 Joules

Answer:

To indicate that energy has been added or removed as heat or work to a system, the internal energy of the system is calculated.

This is because:

1- the internal energy follows the formula:

ΔU = Q - W

2- the internal energy is indicated by any alternation in temperature

Therefore, the answer is:

internal energy

Answer:

The required answer is 35100

Answer:

35100mg

Explanation: When converting bigger to smaller units, we move the decimal point to the right side. As there are 6 zeroes, The decimal point will move six places to the right. Therefore answer id 35100mg

Answer:

Explanation:

Thermal Energy and Heat

Shards of ice fly from the sculptor’s chisel. As the crowd

looks on, a swan slowly emerges from a massive block of ice. As

the day wears on, however, drops of water begin to fall from the

sculpture. Drip by drip, the sculpture is transformed into a puddle of liquid water. What makes matter change from one state to

another? To answer this question, you need to think about the

particles that make up matter.

Energy Simply stated, energy is the ability to do work or cause

change. The energy of motion is called kinetic energy. Particles

within matter are in constant motion. The amount of motion of

these particles depends on the kinetic energy they possess. Particles

with more kinetic energy move faster and farther apart. Particles

with less energy move more slowly and stay closer together.

The total kinetic energy of all the particles in a sample of

matter is called thermal energy. Thermal energy, an extensive

property, depends on the number of particles in a substance as

well as the amount of energy each particle has. If either the

number of particles or the amount of energy in each particle

changes, the thermal energy of the sample changes. With identically sized samples, the warmer substance has the greater thermal energy.

A hollow steel shaft is to transmit 4200 n.m of torque and is to be sized so that the torsional stress does not exceed 120 Mpa

If the inside diameter is 70 percent of the outside diameter, what size shaft should be used?

Answer:

the preferred outer diameter  of the hollow steel shaft obtained a little bit higher than 61.67 mm is 80 mm

the preferred inner diameter of the hollow steel obtained a little bit lower than 56 mm is 50 mm

Explanation:

From above;

let the inside diameter be [tex]d_i[/tex]

let the outside diameter be [tex]d_o[/tex]

Then

[tex]d_i[/tex] = 70%  [tex]d_o[/tex]

[tex]\dfrac{d_i}{d_o} = \dfrac{70}{100}[/tex]    

[tex]\dfrac{d_i}{d_o} =0.7[/tex]   ------ (1)

to determine the outer diameter of the hollow steel shaft by using the equation of the torque, we have:

[tex]T = \dfrac{\pi}{16} \times \tau \times d_o^3 ( 1 - (\dfrac{d_i}{d_o})^4)[/tex]

where;

[tex]\tau[/tex] = torsoinal shear stress = 120 MPa

[tex]4200= \dfrac{\pi}{16} \times 120\times 10^6 \times d_o^3 ( 1 - 0.7)^4)[/tex]

[tex]4200= 0.19635 \times 120\times 10^6 \times d_o^3 (0.7599)[/tex]

[tex]4200=17904763.8 \ d_o^3[/tex]

[tex]d_o^3 = \dfrac{4200}{17904763.8}[/tex]

[tex]d_o^3 = 2.3457 \times 10^{-4}[/tex]

[tex]d_o =\sqrt[3]{2.3457 \times 10^{-4}}[/tex]

[tex]d_o =0.06167 \ m[/tex]

[tex]d_o =0.06167 \ m \times (\dfrac{1000 \ mm}{1 \ m})[/tex]

[tex]d_o =61.67 \ mm[/tex]

From the tables of A-17 of sized and Renard Numbers,

the preferred outer diameter  of the hollow steel shaft obtained a little bit higher than 61.67 mm is 80 mm

However, from equation (1)

[tex]\dfrac{d_i}{d_o} =0.7[/tex]   ------ (1)

replacing the value of [tex]d_o[/tex]

[tex]\dfrac{d_i}{80} =0.7[/tex]

[tex]d_i = 80 \times 0.7[/tex]

[tex]d_i = 56 \ mm[/tex]

From the tables of A-17 of sized and Renard Numbers,

the preferred inner diameter of the hollow steel obtained a little bit lower than 56 mm is 50 mm

Answer:

14.64*10^-3 m

Explanation:

given that

Length of the wavelength, λ = 500*10^-9 m

Diameter of the hole, D = 0.5 mm

length of the slit, L = 6 m

W = 2.44 λL / D, where

W = width of the screen in m

λ = wavelength of the light in nm

L = length of the slit in m

D = diameter of the hole in m

on substituting the values, we have

W = (2.44 * 500*10^-9 * 6) / 0.5*10^-3

W = 7.32*10^-6 / 0.5*10^-3

W = 0.01464 mm

or also, 14.64*10^-3 m

answer :

Visible: Our eyes detect visible light. Fireflies, light bulbs, and stars all emit visible light. Ultraviolet: Ultraviolet radiation is emitted by the Sun and are the reason skin tans and burns. "Hot" objects in space emit UV radiation as well.

Which objects emit electromagnetic waves?

All objects emit electromagnetic radiation according to their temperature. Colder objects emit waves with very low frequency (such as radio or microwaves), while hot objects emit visible light or even ultraviolet and higher frequencies.