All of the following are examples of heat conduction except
a pressing a shirt with a hot iron.
b warming your hands over a campfire.
warming your hands by holding a cup of hot
chocolate.
C
d heating soup in a pan on a stovetop.

The initial speed of the projectile is 18.5m/s

Projectile motion is the motion of an object thrown into the air under gravity. Examples of projectiles include a fired bullet, a thrown javelin e t.c

When a projectile is launched horizontal, it's horizontal range is given as R = u(√2h/g)

R = 300ft = 91.44meters

h= 120m

therefore 91.44= u( √ 2×120/9.8)

91.44 = u ( √24.49)

91.44 = 4.95 u

divide both sides by 4.95

u = 91.44/4.95

u = 18.5m/s

therefore the speed of the projectile is 18.5m/s

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Temperature is not one of the basic properties  subatomic particle. The basic properties of a subatomic particle are its mass, spin, charge (electrical), and its interaction with other particles. Option C is Correct.

This means that regardless of how many interactions or reactions occur, the overall electric charge in a system never changes.

When subjected to an electromagnetic field, matter with an electric charge experiences a force. Objects with the same electric charge repel one another whereas those with differing charges attract one another. Electric charge can be positive or negative.

Subatomic particles like electrons and protons are capable of carrying electric charge, and the quantity of these particles in an object determines how much charge it has. Electric charge is conserved, which means that it can only be moved between objects and cannot be created or destroyed.

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Answer:

6.93 m/s^2

Explanation:

Given that the The net external force on the propeller of a 3.32 kg model airplane is 23 N forward

Where

Mass M = 3.32kg

Force F = 23 N

Force = mass × acceleration

Substitute all the parameters into the formula

23 = 3.32 × a

a = 23/3.32

a = 6.93 m/s^2

Therefore, the acceleration of the airplane is 6.93 m/s^2

the answer for the question is D. all of the above

Answer:

How Are Grocery Store Aisles Organized? The aisles of a grocery store are organized into categories. ... Dairy aisles are along the back not connected to but close by the meat section. This will bring you back to the front of the other side of the store where the bread and bakery area is

Answer:

The word "normal" in the phrase "normal force" indicates that: The force exerted by a surface is perpendicular to itself.

Explanation:

The Normal force refers to:

we can say that,

The standard force on the object lying on some surface is equivalent to the force of gravity.

generally The normal force is denoted with "N"

N = m*g

where m is mass of an object and g is gravitational acceleration.

hence

The word "normal" in the phrase "normal force" indicates that: The force exerted by a surface is perpendicular to itself.

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Answer:

44.7 meter per second

Explanation:

The formula to find velocity is

V = (2 · KE / m)^1/2

V = velocity

KE = Kinetic energy

m = mass

Let's calculate

(2 · 10000 / 10) ^1/2 = 44.7 meter per second

Answer:

0.58

Explanation:

Sinẞ = opposite ÷ hypotenuse

Sinẞ = 5 ÷ 8.6

Sinẞ = 0.5814

Sinẞ ≈ 0.58

Answer:    0.58

Explanation:

hope this helps

Fun Fact: Peanuts aren’t technically nuts

Simple!

Depending on the subject, if it's Microsoft drawing, say "It's the same way" but if it's with coding, that is a whole other can of worms

The numeric value of the steady-state solution is 3360 grams. It is the value that the amount of salt in te tank tends to approach as time goes to infinity.

Let's denote the amount of salt in the tank at time t as S(t) (in grams). We need to find a differential equation that models the rate of change of salt in the tank over time.

The rate at which salt enters the tank is given by the concentration of salt in the incoming brine (6 grams salt/liter) multiplied by the rate at which brine is pumped into the tank (4 liters/minute).

Therefore, the rate of salt entering the tank is (6 grams/liter) * (4 liters/minute) = 24 grams/minute.

The rate at which salt leaves the tank is given by the concentration of salt in the tank (S(t)/V(t), where V(t) is the volume of the solution in the tank at time t) multiplied by the rate at which the solution is pumped out of the tank (4 liters/minute).

Therefore, the rate of salt leaving the tank is (S(t)/V(t)) * (4 grams/minute).

The rate of change of salt in the tank is the difference between the rate of salt entering and leaving the tank:

dS(t)/dt = 24 - (S(t)/V(t)) * 4

Now, we need to find an expression for V(t).

The volume of the solution in the tank at time t is the initial volume (800 liters) minus the rate at which solution is pumped out (4 liters/minute) multiplied by the time (t in minutes):

V(t) = 800 - 4t

Substituting V(t) into the differential equation:

dS(t)/dt = 24 - (S(t)/(800 - 4t)) * 4

To solve this differential equation, we need to find the particular solution that satisfies the initial condition S(0) = 4000. After solving the differential equation, we find the steady state solution, which is the value of S(t) when the rate of change is zero:

0 = 24 - (S_s/(800 - 4t)) * 4

Simplifying the equation:

S_s/(800 - 4t) = 24/4

S_s/(800 - 4t) = 6

Cross-multiplying:

S_s = 6 * (800 - 4t)

S_s = 4800 - 24t

At steady state, the rate of salt entering the tank (24 grams/minute) equals the rate of salt leaving the tank [(S_s/(800 - 4t)) * 4 grams/minute]. Therefore, the steady state solution is given by S_s = 4800 - 24t.

To find the amount of salt in the tank 60 minutes after the process begins (t = 60), we substitute t = 60 into the steady state solution:

S_s = 4800 - 24 * 60

S_s = 4800 - 1440

S_s = 3360 grams

The steady state solution, S_s = 3360 grams, represents the amount of salt in the tank when the system has reached a dynamic equilibrium.

In this case, the steady state solution makes sense because it indicates that after a sufficient amount of time, the amount of salt in the tank will stabilize at 3360 grams.

This occurs when the rate of salt entering the tank equals the rate of salt leaving the tank, resulting in a balanced system.

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Answer:

Explanation:

b )

Normal force R = mgcosθ

= 76.6 x 9.8 x cos 38

R = 591.5 N

c )

Force of friction

= μ R

μ is coefficient of friction .

= .15 x 591.5

= 88.73 N

d )

Net force

= mg sinθ - friction

= 76.6 x 9.8 x sin 38 - 88.73

= 462.16 - 88.73

= 373.43 N

Acceleration = 373.43 / 76.6

a = 4.87 m / s²

e )

v² = u² + 2 a s

s = 40.5 m

a = 4.87

u = 0

v² = 0 +2 x 4.87 x 40.5

= 394.5

v = 19.86 m /s

f )

v = u + a t

19.86 = 0 + 4.87 t

t = 4 .07 s

Answer: i really don't know bu i recomened you watch josie b asmr she is the best

Explanation:

Since I don't have access to the specific Figure 2 you mentioned, I won't be able to provide you with the exact equations of motion for the mass in the given system. However, I can provide you with a general framework for determining the equations of motion for a spring-mass system.

In a spring-mass system, the forces acting on the mass include the gravitational force (mg) and the spring force (kx), where m is the mass of the object, g is the acceleration due to gravity, k is the spring constant, and x is the displacement of the mass from its equilibrium position.

Using Newton's second law (F = ma), we can set up the equation of motion for the mass:

This is a second-order linear differential equation, where (d^2x/dt^2) represents the acceleration of the mass with respect to time.

To solve this equation and obtain the equations of motion for the mass, you would need to apply appropriate initial conditions, such as the initial position and velocity of the mass.

If you can provide more specific information or a detailed description of the system in Figure 2, I can assist you further in determining the equations of motion.

Velocity is a vector quantity that indicates how fast an object is moving. The magnitude of this vector is called speed and is expressed in meters per second. Velocity or speed: the quotient between the distance traveled and the time interval. Velocity or speed is a scalar quantity. Speed ​​or velocity is the quotient of the displacement with the time interval. Speed ​​or velocity is a vector quantity.

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The correct answer is C. A central bright spot with one dimmer spot on each side can be seen.

When diffraction of light occurs with a single slit, a phenomenon known as single-slit diffraction takes place. This phenomenon causes the light waves passing through the slit to spread out and interfere with each other, resulting in a pattern of dark and bright fringes on a screen placed behind the slit.

The central bright spot corresponds to the region on the screen where the light waves passing through the center of the slit interfere constructively. This means that the waves are in phase and reinforce each other, creating a bright spot.

On either side of the central bright spot, there are additional spots that are progressively dimmer. These dimmer spots correspond to regions where the waves passing through the slit interfere destructively. Here, the waves are out of phase and cancel each other out, resulting in a reduced intensity of light.

Therefore, a central bright spot with one dimmer spot on each side constitutes one interference fringe. The bright spot at the center and the dimmer spots on the sides together form this interference fringe pattern.

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Answer:

Explanation:

Ammonium Hydroxide has the chemical formula of

NH4OH

There is 1 Nitrogen (N) = 1

There are 5 Hydrogens (H) = 5

There is 1 Oxygen  (O) = 1

In total, there are 7 atoms in 1 molecule of NH4OH

All components of the velocity vector are zero for t = 0, the particle is at rest for t = 0.

For what values of t is the particle at rest?

The position of a particle moving in the xy-plane is given by the parametric equations r = (3t) and v = (2t, 3t², 12t). To find for what values of t the particle is at rest, we need to find when the velocity vector (v) is equal to zero.

The velocity vector v is given by (2t, 3t², 12t). For the particle to be at rest, all components of the velocity vector must be equal to zero.

1. For the x-component (2t) to be zero: 2t = 0. Solving for t, we get t = 0.

2. For the y-component (3t²) to be zero: 3t² = 0. Solving for t, we get t = 0.

3. For the z-component (12t) to be zero: 12t = 0. Solving for t, we get t = 0.

Since all components of the velocity vector are zero for t = 0, the particle is at rest for t = 0.

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Answer:

can anyone translate

Explanation:

because i cant read this

Answer:

49 km/h

Explanation:

60 km/h acceleration for 0.75 hours.

60 × 3/4 = 45 km/h

Take the acceleration and add it to the speed the train was already moving at:

45 + 4 = 49km/h

The correct answer is(b). There is a physical change from the solid state to a gas state where energy between the molecules increases.

During sublimation, carbon dioxide transitions directly from the solid state (dry ice) to the gas state without passing through the liquid phase. In this process, individual molecules of carbon dioxide gain energy from the surroundings, leading to an increase in their kinetic energy and molecular movement.

As a result, the carbon dioxide molecules separate from each other and form a gas. This phase change is considered a physical change rather than a chemical change since the chemical composition of carbon dioxide remains the same throughout the process.

Therefore, the sublimation of carbon dioxide results in a physical change where the molecules transition from the solid state to the gas state, gaining energy and increasing their molecular movement.

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Answer:

KE=800,000

Explanation:

The formula for kinetic energy is KE=1/2mv^2 or Kinetic Energy= 0.5*mass*velocity^2

so 1000 is the mass and 40 is the velocity

KE=0.5*1000*40^2

KE=0.5*1,000*1,600

KE=800,000 Joules

Given data

*The given initial velocity is u = 0 m/s

*The given acceleration is a = 7 m/s^2

*The given final velocity is v = 25 m/s

The formula for the time taken to reach his final velocity is given by the kinematic equation of motion as

Substitute the known values in the above expression as

Thus, the time taken to reach his final velocity is t = 3.57 s

As a result, m2's post-collision speed is +3.25 m/s.

When two objects collide in an elastic collision, they disperse after impact and retain all of their kinetic energy. The energy of motion, or kinetic energy, is discussed in more depth elsewhere.

The equation for conserving momentum is:

m1*v1i + m2*v2i = m1*v1f+m2*v2f

Inputting the values provided yields:

m1*v1i + m2*v2i = m1*v1f+m2*v2f

m1 * 6.0 m/s + m2 * 4.0 m/s = m1 * 5.0 m/s + m2 * v2f

(1/2) * m1 * v1i² + (1/2) * m2 * v2i² = (1/2) * m1 * v1f² + (1/2) * m2 * v2f²

Inputting the values provided yields:

(1/2) * m1 * 6.0² + (1/2) * m2 * 4.0² = (1/2) * m1 * 5.0² + (1/2) * m2 * v2f²

When we simplify and solve for v2f, we obtain:

v2f = (m1 * v1i + m2 * v2i - m1 * v1f) / m2

v2f = (11 * 6.0 + 4 * 4.0 - 11 * 5.0) / 4

v2f = 3.25 m/s.

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The correct answer is: (a) An object gives another object an opposite charge without losing any of its own charge.

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Answer:

friction

air drag

every thing that opposes the motion affects kinetic energy

Explanation:

kinetic energy is a energy which is increase with increase in motion and potential energy is energy stored while the object is at rest

potential energy ∝ 1/(kinetic energy)

as kinetic energy increases potential energy decreases

The persοn is mοving at a speed οf 55 miles per hοur in the Sοuth directiοn when the persοn is 50 miles West and 70 miles Sοuth οf the car, and the distance between them is increasing at a rate οf 55 miles per hοur.

Tο determine the speed at which the persοn is mοving, we can use the cοncept οf relative velοcity.

Let's cοnsider the hοrizοntal and vertical cοmpοnents separately:

Hοrizοntal Cοmpοnent:

The persοn is walking due East, which is perpendicular tο the Nοrth directiοn οf the car. Therefοre, the hοrizοntal cοmpοnent οf the persοn's velοcity dοes nοt affect the speed at which the persοn is mοving away frοm the car.

Vertical Cοmpοnent:

The persοn is 70 miles Sοuth οf the car, and the distance between them is increasing at a rate οf 55 miles per hοur. This indicates that the persοn's vertical pοsitiοn is changing with time. Since the persοn is mοving in the Sοuth directiοn and the distance is increasing, the persοn's speed can be determined by the rate οf change οf the vertical distance.

Given that the distance is increasing at a rate οf 55 miles per hοur, the persοn's speed in the Sοuth directiοn is 55 miles per hοur.

Therefοre, the persοn is mοving at a speed οf 55 miles per hοur in the Sοuth directiοn when the persοn is 50 miles West and 70 miles Sοuth οf the car, and the distance between them is increasing at a rate οf 55 miles per hοur.

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Answer:

B

endothermic: heat taking in

exothermic: heat given out

Answer:

I thin that the answer is d because the energy goes high and then it goes down a bit

Explanation:

The flux of the curl of the field F across the given surface S is 108π. To calculate the flux of the curl of the field F across the surface S using Stokes' Theorem, we need to evaluate the surface integral ∬S curl(F) · dS, where curl(F) is the curl of the field F and dS is the outward-pointing vector normal to the surface.

First, we find the curl of the field F:

curl(F) = (curl(F))_x i + (curl(F))_y j + (curl(F))_z k

= (0 - 1) i + (1 - 0) j + (3 - 2) k

= -i + j + k

Next, we parameterize the surface S using the given equation r(r, θ):

r(r, θ) = rcosθ i + rsinθ j + (9 - r^2) k

We calculate the cross product of the partial derivatives of r(r, θ) with respect to r and θ to obtain the normal vector to the surface S:

dS = (∂r/∂r) × (∂r/∂θ) dr dθ

= (cosθ i + sinθ j - 2r k) dr dθ

Now, we evaluate the surface integral:

∬S curl(F) · dS = ∫∫ curl(F) · dS

= ∫∫ (-i + j + k) · (cosθ i + sinθ j - 2r k) dr dθ

= ∫∫ (-cosθ + sinθ - 2r) dr dθ

Integrating with respect to r from 0 to 3 and with respect to θ from 0 to 2π, we obtain:

∫∫ (-cosθ + sinθ - 2r) dr dθ = 108π

Therefore, the flux of the curl of the field F across the surface S is 108π.

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Answer:

trick to this answer in this question

The value of the resistance of R₂, given that the total resistance in the circuit is 15 ohms is 5 ohms (option D)

The following data were obtained from the question:

Total resistance in series connection is given by the following formula:

R = R₁ + R₂ + R₃ + ... + Rₙ

Inputting the various parameters given, we can obtain the resistance of R₂ as follow:

R = R₁ + R₂

15 = 10 + R₂

Collect like terms

R₂ = 15 - 10

R₂ = 5 ohms

Thus, we can conclude from the above calculation that the resistance of R₂ is 5 ohms (option D)

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Complete question:

See attached photo