Two thin spherical shells, one with radius R and the other with radius 2R, surround an isolated charge point particle. The ratio of the number of field lines through the larger sphere to the number through the smaller is:

Explanation:

weight of the piano = mg

w = 99 x 10 =990 N

a) The air to fuel ratio (AFR) for complete combustion of n-heptane is approximately 14.6:1.

b) The heat of combustion for n-heptane at 25°C and 1 atm is approximately 48.7 MJ/kg.

c) Assuming 120% excess air in the reaction, the AFR would be approximately 17.3:1.

d) The heat of combustion for n-heptane with 120% excess air at 25°C and 1 atm is approximately 48.7 MJ/kg.

The air to fuel ratio (AFR) is the ratio of the mass of air to the mass of fuel required for complete combustion. In the case of n-heptane, a hydrocarbon fuel, if complete combustion occurs, it means that all the fuel reacts with the available oxygen in the air without any side reactions.

a) To find the AFR for complete combustion, we need to consider the stoichiometry of the reaction. For n-heptane, the balanced chemical equation is \(C_7H_1_6 + 11O_2 \geq 7CO_2 + 8H_2O\). From this equation, we can see that 1 mole of n-heptane requires 11 moles of oxygen. Since air contains about 21% oxygen by volume, the AFR can be calculated as 1/(0.21*11) = approximately 14.6:1.

b) The heat of combustion is the amount of heat released when one unit mass of a substance undergoes complete combustion. The heat of combustion for n-heptane at 25°C and 1 atm is approximately 48.7 MJ/kg.

c) Assuming 120% excess air means providing 120% more air than the stoichiometric requirement. In this case, the AFR would be calculated as (1 + 1.2)/(0.21*11) = approximately 17.3:1.

d) The heat of combustion remains the same, regardless of the excess air. Therefore, the heat of combustion for n-heptane with 120% excess air at 25°C and 1 atm is approximately 48.7 MJ/kg.

Learn more about air to fuel ratio

brainly.com/question/29006664

#SPJ11

Answer:

Fc = M v^2 / R       centripetal acceleration

Fc2 / Fc1 = R1 / R2     since M and v are the same for both

If R2 = 3 R1 then the centripetal acceleration for particle 2 will be 1/3 of that of innermost (R1) particle

Answer: decrease

Explanation: it does

Answer:

(A). The force acting on the rocket is mg.

(B). The initial upward acceleration of the rocket is 6.2 m/s²

Explanation:

Given that,

Mass of rocket = 5 kg

Force = 80 N

Time = 4 sec

(A). We need to draw the figure

The force acting on the rocket at each of the intervals is shown in figure.

The force acting on the rocket is mg.

(B). We need to calculate the initial upward acceleration of the rocket

Using balance equation

\(ma=F-mg\)

\(a=\dfrac{F-mg}{m}\)

Put the value in the equation

\(a=\dfrac{80-5\times9.8}{5}\)

\(a=6.2\ m/s^2\)

Hence, (A). The force acting on the rocket is mg.

(B). The initial upward acceleration of the rocket is 6.2 m/s²

Answer:

The correct option is (c) "it bounces the light towards a focal point"

Explanation:

There are two types of spherical mirrors i.e. concave and convex.

A concave mirror is a type of spherical mirror that is curved inwards. For this type of mirror the rays of light are bounced back and converge to the focal point of the mirror.

So, the correct option is (c).

Answer:

c

Explanation:

Given

A massive light hangs over the table in Jeremy's dining room. The light is supported by four strong chains which make an angle of 72° with the horizontal.

The force in each chain is F=36.4 N.

To find

The mass of the light in kg

Explanation

Let the mass of the light be m

The weight of the light acts downwards.

To balance thisi force the force on the string vertically upward is considered

In equillibrium

Conclusion

The mass of the light is 13.84 kg

Infrared region of the electromagnetic spectrum does 1280nm radiation occur.

1280 nm radiation occurs in the infrared region of the electromagnetic spectrum. Infrared radiation has wavelengths longer than those of visible light, but shorter than those of microwaves. It is often referred to as "heat radiation" because it is associated with the thermal energy of an object.

Infrared radiation is used in a wide range of applications such as thermal imaging cameras, remote sensing, and in the production of heat lamps. It is also used in communication systems such as TV remote controls and in some fiber optic communications. In addition, infrared radiation is used in medical applications such as infrared thermography, where it is used to detect and diagnose a range of medical conditions.

To learn more about electromagnetic spectrum visit: https://brainly.com/question/23727978

#SPJ11

Answer: sonar and radar

Explanation:

Picture

Answer:

but the answer should be no as if 3 bulbs are connected together if one burns out the whole circuit will stop .hope you understood

please mark me as brainlist

The most commonly used GMAW electrode wire that works great with CO₂ is ER70S-6.

Gas Metal Arc Welding (GMAW), also known as MIG (Metal Inert Gas) welding, uses an electrode wire to create an arc that melts and fuses the base metal. The electrode wire, also referred to as the filler wire, plays a crucial role in the welding process.

ER70S-6 is a widely used electrode wire in GMAW applications and is particularly suitable for welding with CO₂ as the shielding gas. It is a solid wire composed of mild steel with specific chemical compositions to provide excellent welding performance and desirable mechanical properties.

The "ER" in the designation stands for Electrode or Rod, "70" represents the tensile strength in ksi (kilo-pounds per square inch), and "S-6" indicates its suitability for general-purpose welding.

ER70S-6 wire offers good arc stability, smooth bead appearance, and low spatter levels, making it highly versatile and suitable for various welding projects. When used with CO₂ as the shielding gas, it provides good penetration, strong welds, and high deposition rates. CO₂ is a commonly used shielding gas in GMAW due to its availability and affordability.

It's important to note that the choice of electrode wire may vary depending on the specific welding application, base metal, and desired welding characteristics. Consulting welding guidelines and considering factors such as material type, joint design, and welding parameters will help determine the most appropriate electrode wire for a particular welding task.

To know more about GMAW electrode refer here:

https://brainly.com/question/32221386#

#SPJ11

Answer:

Explanation:

Projectile Motion. Projectile motion is different than free fall: it involves two dimensions instead of one. ... Balls traveling in two dimensions, only one of which experiences acceleration, require two sets of equations: one set for the x-direction and the other for the y-direction.

Answer:

So the weight of the body is 700N

Explanation:

mass of the object=70kg

force of gravity=10N/kg

weight of the object=w-?

as we know that

weight=mass × force of gravity

weight=70kg × 10N/kg

WEIGHT OF THE BODY=700N

I HOPE IT WILL HELP YOU

GOOD LUCK FOR THE ASSIGNMENT

The correct answer is 700 N.

Object mass = 70 kg

Gravity = 10N / kg

Weight = Mass x Gravity

Weight = 70kg x 10N / kg

Weight = 700 N

Mass is more basic because it is a unique property of the object. Weight varies from place to place depending on the acceleration of gravity. If the mass on the earth is m = 10kg, the weight is W = mg = 10 x 10 = 100N.

The strength of the Earth's gravitational field is 10 Newtons (N / kg) per kilogram. This means that there is a force of 10 Newtons per kilogram on Earth. Mass is the amount of substance that makes up an object.

Learn more about gravitational strength here: https://brainly.com/question/25624188

#SPJ2

Answer:

a) F = 250 [N]

Explanation:

Force can be calculated by means of Newton's second law, which tells us that force is the product of mass by acceleration.

a)

F = m*a

where:

F = force [N]

m = mass = 25[kg]

a = gravity acceleration = 10 [m/s²]

F = 25*10 = 250 [N]

Yes, this force would be different on Mars, since the gravitational acceleration of Mars is different from that of Earth.

gm = Martian gravity = 3.72 [m/s²]

Fm = 3.72*25 = 93 [N]

Answer:

north pole of a magnet repels the north pole of another magnet no matter of their shape , size , weakness , strength ,etc .

Explanation:

The maximum allowable torque for a 60-mm-diameter shaft made of 6061-T6 aluminum, given that the allowable shear stress is τallow = 80 MPa and the angle of twist of disk a relative to disk c is limited so that it does not exceed 0.050 rad is 218.1 Nm.

Explanation:

Given parameters: Diameter of shaft = 60 mm, Shear stress allowable = τallow = 80 MPa, Angle of twist of disk a relative to disk c is limited so that it does not exceed 0.050 rad.

The formula used: The equation for torque is given as, T = (π/16) * τallow * d³ * (θ/L) Where, T = maximum allowable torqueτallow = allowable shear stress = diameter of the shaftθ = angle of twist, L = length of the shaft. According to the problem, the diameter of the shaft is 60 mm. So, the radius will be 30 mm or 0.03 m.

The angle of twist is limited to 0.050 rad. Let's consider the length of the shaft to be 1 m. So, using the formula we get the maximum allowable torque, T = (π/16) * τallow * d³ * (θ/L)T = (π/16) * 80 * (0.06)³ * 0.050/1T = 218.1 NmTherefore, the maximum allowable torque is 218.1 Nm.

To know more about torque, visit:

https://brainly.com/question/25708791

#SPJ11

Answer:

1000m=1km

simple :) . . .

The density of the ga when it condense while put it in a refrigerator, When it cool, it condense and become a liquid, has decreases.

The mass of a material substance per unit volume is referred to as its density. The formula d = M/V, where d stands for density, M for mass, and V for volume, describes density. The measurement for density is grams per cubic centimeter. For instance, water has a density of 1 grams per cubic centimeter as opposed to Earth's density of 5.51 grams. Kilograms per cubic meter is another way to measure density (in meter-kilogram-second or SI units). Density makes it simple to calculate the relationship between mass and volume. For instance, M = Vd is the formula for calculating a body's mass, while V = M/d is the formula for calculating a body's volume.

To know more about  density visit : https://brainly.com/question/952755

#SPJ4

Answer:

1.05m

Explanation:

To get this answer, you must first know how long it takes the ball to reach the ground. In order to figure that out, the process is simple:

First: Multiply the object's height by 2.

2.4x2=4.8

Next: Divide that answer by the speed of Gravity, 9.8 or 9.81m/s^2

(I prefer to use the method used by engineers, attend to precision, so I keep the same number of decimals in each number I am calculating.)

4.8/9.8=0.48979591836734693877551020408163m/s^2

Next: Square Root this answer.

=0.69985421222376517091350973563025

Last: Multiply your square rooted answer by your  forward velocity.

0.69985421222376517091350973563025x1.5=

1.0497813183356477563702646034454 or, since Khan Academy only wants three significant digits, round up to 1.05.

Answer:

1.05

Explanation:

what the other guy said trust

Answer:

What she can do to collect the data is;

B. Gather a few oranges and see how many seeds are in each

Explanation:

The quantity Katie wants to find out is the number of seeds contained in each orange

Therefore, the required population = The number of seeds in a given orange

The method of estimation of the number of seeds per orange is sampling method, whereby the number of seeds in each of the orange in the sample is used to as an hypothesis as to the number of seeds expected in each orange of the entire population.

Therefore, in order to collect the data, she can gather a few oranges and see how many seeds are in each.

Answer:

The mass formula is given as

Mass = ρ × v

Where,

ρ = density and

v = the volume

The weight mass formula is given as

m = w / g

Where,

w= weight

m = mass

g = gravity

The mass formula is also given as

m = F / a

If acceleration itself is the gravity, then

M = F / g

Where,

F = force

G = gravity

According to Einstein’s mass-energy relation

m = (E / c2)

Where,

m = mass

E = energy

c = speed of light (3×108 m/s)

The kinetic energy mass formula is given as

K.E = ½ mv2

Where,

m = mass,

v = velocity.

Explanation:

pls mark me as brainliest

As the pendulum moves around the circle, the centripetal acceleration remains constant in magnitude but changes in direction. This is because the tangential velocity of the bob changes direction as it moves around the circle, but its speed remains constant.

The centripetal acceleration experienced by the bob of the conical pendulum is given by the formula \(a = v^2/r\),

Since the pendulum is rotating with a constant angular velocity, the tangential velocity is also constant, given by:

v = 2πr/T,

where T is the period of one revolution. The period is 60/20 = 3 seconds since the pendulum makes 20 revolutions per minute.

Thus, v = 2π*2/3 = 4.19 m/s.

Therefore, the centripetal acceleration is \(a = 4.19^2/2 = 8.77 m/s^2.\)

To know more about centripetal acceleration, here

brainly.com/question/14465119

#SPJ1

--The complete Question is, A conical pendulum is set up in a non-inertial frame of reference that is rotating with a constant angular velocity. The length of the string is 2 meters, and the mass of the bob at the end of the string is 0.5 kg. The pendulum makes 20 revolutions per minute. What is the centripetal acceleration experienced by the bob, and how does this acceleration change as the pendulum moves around the circle?--

Answer:

630 km.

Explanation:

To obtain the total distance travelled by David, we shall calculate the distance travelled in each, then sum them together.

Case 1:

Speed 1 (S₁) = 65 km / hour

Time 1 (t₁) = 6 hours

Distance 1 (d₁) =?

Speed = Distance /time

S₁ = d₁ / t₁

65 = d₁ / 6

Cross multiply

d₁ = 65 × 6

d₁ = 390 Km

Case 2:

Speed 2 (S₂) = 80 km / hour

Time 2 (t₂ ) = 3 hours

Distance 2 (d₂) =?

Speed = Distance /time

S₂ = d₂ / t₂

80 = d₂ / 3

Cross multiply

d₂ = 80 × 3

d₂ = 240 Km

Finally, we obtained the total distance travelled by David as follow

Distance 1 (d₁) = 390 Km

Distance 2 (d₂) = 240 Km

Total Distance travelled (dₜ) =?

Total distance = distance 1 + distance 2

dₜ = d₁ + d₂

dₜ = 390 + 240

dₜ = 630 km

Therefore, the total distance travelled by David is 630 km

A vector is a mathematical element that represents the segment of a line, with a given orientation, and are usually written like:

v = <x, y>

Here the vector has 2 components, but it can have more.

The correct option is 2: time.

Now we want to see which ones of these can't be written as a vector, let's analyze each one.

1) Displacement.

We can "break" the displacement into displacement in the x-direction and displacement in the y-direction, thus this can be written as a vector.

2) Time.

Time is an independent variable, and it is not a vector (time has a single dimension).

3) Acceleration.

We can break acceleration into an acceleration in the x-direction and acceleration in the y-direction, thus acceleration is a vector.

4) Velocity.

Exactly similar to acceleration, velocity is a vector.

Then the only correct option is 2, Time.

If you want to learn more, you can read:

https://brainly.com/question/17108011

Answer:

The Artemis program is a U.S. government-funded international human spaceflight program that has the goal of landing the first woman and the next man on the Moon, specifically at the lunar south pole region, by 2024.

Follow me please

Mark brainliest

Answer:

false

Explanation: