By which method is heat transferred in a microwave oven? A.Conduction B.Convection C.Evaporation D.Radiation if you get it right i will give you a brainliest

If a particle's velocity is nonzero, then its acceleration can be zero, because acceleration is the rate of change of velocity. If the velocity is constant and does not change, the acceleration is zero.

The rate of change of an object's velocity with respect to time is defined as acceleration. Vector quantities are accelerations. The orientation of an object's acceleration is determined by the orientation of its net force.

Because velocity is both a speed and a direction, there are only two ways to accelerate: modify your speed or your direction—or both.

Learn more about acceleration here:
https://brainly.com/question/460763

#SPJ1

Answer:

Ca = 2

Cl = 2

O = 6

Explanation:

Element given from the question above include = 2CaClO₃

NOTE: The 2 in front of CaClO₃ is affecting Ca, Cl and O.

Thus, the number of each atom of element present in 2CaClO₃ can be obtained as follow:

Ca = 1 × 2 = 2

Cl = 1 × 2 = 2

O = 3 × 2 = 6

Thus,

Ca = 2

Cl = 2

O = 6

Answer:

To find the acceleration of the object, we can use the formula: acceleration = (final velocity - initial velocity)/time.

Plugging in the given values, we get: acceleration = (0 m/s - 240 m/s)/1 minute.

Since 1 minute is equal to 60 seconds, we can convert the time to seconds to get: acceleration = (0 m/s - 240 m/s)/60 seconds.

Simplifying this equation gives us: acceleration = -4 m/s^2.

Therefore, the acceleration of the object is -4 m/s^2. The correct answer is therefore (-4).

Answer:

Explanation:

For discharge of capacitor in RC circuit , the relation is as follows

\(V=V_0e^\frac{-t}{\lambda}\)

V is voltage across the capacitor , V₀ is maximum  voltage across capacitor  , λ is time constant and t is the time after which the voltage is recorded. During discharge this will also be voltage across resistance .

Taking log on both sides

lnV = lnV₀   -  \(\frac{t}{\lambda}\)

Given equation

[lnV] = - .027 t + 2.5

Comparing these equation

\(\frac{1}{\lambda} = .027\)

λ = 37 s

time constant = 37 sec.

Sentences 20, 21, 22, and 23 can be completed as follows:

20. B. Ultraviolet is used to observe star birth and far away galaxies.

21.  D. Radio waves is used to observe the depths of the Milky Way galaxy.

22. C. Gamma rays are used to observe supernova explosions and radioactive decay.

23. C. Wernher von Braun developed the V-2 rocket.

Rays are beams of light and radiation that can be harmful when used wrongly or advantageous for scientific purposes.

As scientists study extraterrestrial bodies, they often have to use rays for their findings. Gamma rays are known for their use in observing supernova explosions. Also, Wernher Braun is attributed to the development of the V-2 rocket.

Learn more about gamma rays here:

https://brainly.com/question/22166705

#SPJ1

Answer:

Mass and distance

Explanation:

Answer:

Mass and distance

Explanation:

the larger the mass the faster it falls or more gravity is applied same goes for the distance the farther it is from the ground its heavier however if its to far gravity then does not apply

hope this helps :)

can have brainlist please

If the light spring is stretched with a spring constant of 102 N/m then, the elongated length of the spring will be 0.48 meters.

Spring constant is the force which is needed to stretch or press a spring, divided by the distance that the spring gets longer or shorter.

Given,

Spring constant of light spring k = 102.0N/m

mass of balloon m = 1.75g = 1.75 × 10⁻³ Kg

Density of helium (He) = 0.179 kg/m

Density of air = 1.204 kg/m³

Volume of balloon/helium V = 4.92 m³

We have 3 forces acting on the spring, two directed downward, one upward. Downward forces are the weight of the balloon and weight gas inside it. of the helium

Upward force is the buoyant force. helium is of lesser density. air.

Now, Fnet = mg + e(He) vg - Ve(air)g

Fnet = g[m + v(e(He)-e(air))]

Fnet = 9.8 (1.75 × 10⁻³+ 4.92(0.179-1.204))

Fnet = 9.8(0.00175 + (-5.04125))

Fnet = 9.8 × -5.04125

Fnet = -49.40 N

The elongation of the spring = IFnetI/ K

Length = 49.40/ 102

Length of spring = 0.48 meters

Therefore, the elongated length of the spring will be 0.48 meters.

Learn more about Spring here:

https://brainly.com/question/14670501

#SPJ1

Answer:

6.2 x 10^6

Explanation:

The 6 at the end is an exponent the carrot is the symbol

Answer:

6.2*10^7 miles

Explanation:

Answer:

looking at aircraft of a similar size and performance, the propeller diameter is generally in the region of 1.4 – 1.8 m (4.6 ft to 6.0 ft).

Explanation:

When a mass m particle is released onto a smooth inclined plane (where the frictional force F=0), it will glide down the slope.

We resolve in the direction of motion in order to get the particle's sliding acceleration.

F=ma, 

mg cos(90∘−θ)=ma, 

g cos(90∘−θ)=a, 

g sin(θ)=a.

How many Newtons is the net force while the block is travelling at a constant speed?

Zero. Newton's first law of motion states that any object travelling at a constant speed experiences no net external forces, hence the total amount of forces acting on the object must be zero. The mathematical expression for an item being under no net external force is Fnet=0 or F=0.

To know more about Newton's laws, visit:

https://brainly.com/question/9405021

#SPJ1

Answer:

its air

give me thanks

Answer:

Air

Explanation:

give me a thanks its 100% right

Answer:

Work done = 0.3142 Nm

Explanation:

Mass of Object is 50 g

Circular path of radius is 10 cm ⇒ 0.1 m

Work done = Force × Distance = ?

*Distance moved (circular path) ⇒ Circumference of the circular path

2πr = 2 × 3.142 × 0.1 ⇒ 0.6284 m

*Force that is enough to move a 50 g must be equal or more than its weight.

therefore convert 50 grams to newton = 0.5 N

Recall that; work done is force times distance

∴ 0.5 N × 0.6284 m

Work done = 0.3142 Nm

Answer:

Mass.

Explanation:

I took the quiz and got the answer right

Answer:

1. Power = 5000 Watts

2. Workdone = 11185.5 Joules

Explanation:

Given the following data;

1. Distance = 18 m

Energy = 100 KJ = 100,000 Joules

Time = 20 seconds

To find the average power of the elevator;

Power = energy/time

Power = 100000/20

Power = 5000 Watts

2. Power = 0.4 HP

Time = 15 seconds

Conversion:

1 horsepower = 745.7 Watts

0.4 horsepower = 0.4 * 745.7 = 298.28 Watts

To find the amount of work done by the electric mixer;

Work done = power * time

Workdone = 745.7 * 15

Workdone = 11185.5 Joules

The speed of the spring from its initial position is 0.8 m/s.

The speed of the spring after it descended from the given position is calculated by applying the principle of conservation of energy.

K.E = U

¹/₂mv² = ¹/₂kx²

mv² = kx²

v² = kx² / m

v = √ ( kx² / m )

where;

The speed of the spring after descending the given distance is calculated as;

v = √ ( 850 x 0.049² / 3.2 )

v = 0.8 m/s

Learn more about speed of spring here: https://brainly.com/question/20357978

#SPJ1

False. E=hf, where h is Planck's constant, c is the speed of light, f is the frequency, and is the wavelength; and E=hc/, where E is directly proportional to frequency and inversely proportional to wavelength.

With respect to the wavelength of the radiation, photon energy is inversely proportional.

Two formulas can be used to determine a photon's energy: E = h f is a formula that can be used if the photon's frequency is known. This equation, sometimes known as Planck's equation, was created by Max Planck.

To know more about wavelength visit:-

https://brainly.com/question/11625774

#SPJ1

The international unit for measuring current is an ampere, sometimes known as an amp or AM-pir. It describes how many electrons—also referred to as "electrical charge"—flow past a certain point on a circuit.

Electric current is measured in a SI unit known as an ampere, or A. It is determined by assuming that the elementary charge, e, has a fixed quantitative score of 1.602 176 634 x 10-19 when represented with in unit C, which would be equivalent to the second in terms of vCs.

The velocity of electron transport or power in a conductive material is measured in amperes. One make this process of electric charges (6.24 x 1018 protons ( h+) traveling by a given location in one second is represented by one ampere of current.

To know more about  ampere visit:

https://brainly.com/question/19611454

#SPJ1

105 secondes

This is an estimate.

Explanation:

To know the distance that the plane needs to travel, we need the circumference of the circle.

Since it travels 150 m per second, for 15,762.8 m it would take:

15,762.8 m * 1 s

Since no work is done, the power exerted is zero. Therefore, the man exerts no power on the wall.

In physics, force is defined as any action that can change the motion of an object or cause an object to accelerate. Force is a vector quantity, meaning that it has both magnitude (size or strength) and direction. The unit of force in the International System of Units (SI) is the Newton (N), which is defined as the amount of force required to accelerate a mass of one kilogram at a rate of one meter per second squared (1 N = 1 kg × 1 m/s^2). Force can be measured using a variety of instruments, such as spring scales, strain gauges, or force plates. Some common types of forces include gravitational force, electromagnetic force, frictional force, and normal force. The study of forces and their effects on the motion of objects is known as mechanics and is a fundamental concept in physics.

Here,

a. The man does not do any work on the wall because the wall does not move. Work is only done when there is a displacement in the direction of the force applied.

b. Since no work is done, no energy is used or transferred.

c. The power exerted by the man can be calculated using the formula:

Power = Work / Time

To know more about force,

https://brainly.com/question/29044739

#SPJ9

Answer:

18000

Explanation:

the is to raise how much work is required is 18000

Work done to raise an object of mass 1200 kg to the height of 15 meters will be equal to 176,400 J.

In physics, the word "work" involves the measurement of energy transfer that takes place when an item is moved over a range by an externally applied, at least a portion of which is applied within the direction of the displacement.

The length of the path is multiplied by the element of a force acting all along the path to calculate work if the force is constant. The work W is theoretically equivalent towards the force f times the length d, or W = fd, to portray this concept.

As per the data given in the question,

Mass of the object, m = 1200 kg

Displacement, d = 15 meters

Then, use the equation of work done,

W = fd

W = (m×a)d

Substitute the values in above equation,

W = 1200 × 9.8 × 15

W = 176,400 J.

To know more about Work:

https://brainly.com/question/13662169

#SPJ2

To solve the given problems, we'll use the principles of work-energy and conservation of energy. Let's address each question one by one:

(1) What is the work done by Chris on the box when the speed of the box reaches 2.1 m/s?

The work done by Chris on the box is equal to the change in the box's kinetic energy. Since the box starts from rest, the initial kinetic energy is zero. The final kinetic energy can be calculated using the formula:

Kinetic energy = (1/2) * mass * velocity^2

Plugging in the values:

Mass of the box (m) = 53 kg

Final velocity (v) = 2.1 m/s

Kinetic energy = (1/2) * 53 kg * (2.1 m/s)^2

Calculate the value of the kinetic energy, which represents the work done by Chris on the box.

(2) What is the speed of the box when it reaches the bottom of the slope (Point B in the diagram)?

To determine the speed at the bottom of the slope, we'll use the principle of conservation of energy. The total mechanical energy of the box is conserved as it moves from the top to the bottom of the slope.

The initial potential energy at the top of the slope is converted into kinetic energy at the bottom of the slope, neglecting any energy losses due to friction.

Potential energy at the top = m * g * h1

Where:

Mass of the box (m) = 53 kg

Acceleration due to gravity (g) = 10 m/s^2

Height difference between floors (h1) = 3.2 m

Calculate the initial potential energy.

The final kinetic energy at the bottom is given by:

Kinetic energy at the bottom = (1/2) * m * v^2

Where:

Mass of the box (m) = 53 kg

Velocity at the bottom (v) = ?

Equating the initial potential energy to the final kinetic energy, solve for v to find the speed of the box at the bottom of the slope.

(3) To what speed does the box slow down when it reaches the bottom of the ramp to the pickup truck?

Since the ramp connecting the first floor to the bed of the pickup truck is frictionless, there is no external force doing work on the box. Thus, the mechanical energy of the box is conserved as it moves from the bottom of the slope to the bottom of the ramp.

Using the same principle of conservation of energy, equate the final kinetic energy at the bottom of the slope to the initial potential energy at the bottom of the ramp.

Potential energy at the bottom of the ramp = m * g * h2

Where:

Mass of the box (m) = 53 kg

Acceleration due to gravity (g) = 10 m/s^2

Height difference between the first floor and the truck bed (h2) = 0.90 m

Calculate the potential energy at the bottom of the ramp.

Equating the potential energy at the bottom of the ramp to the final kinetic energy, solve for the speed of the box at the bottom of the ramp.

(4) What is the speed of the box when it reaches the bed of the pickup truck?

Since the ramp connecting the first floor to the truck bed is frictionless, there is no external force doing work on the box. The mechanical energy of the box is conserved as it moves from the bottom of the ramp to the truck bed.

Using the same principle of conservation of energy, equate the final potential energy at the bottom of the ramp to the final kinetic energy at the truck bed.

Potential energy at the truck bed = m * g * h

Answer:

V = (v1 + v2) / 2 = (8 + 6.5) / 2 = 7.25 m/s     average speed

t = 7.2 / 7.25 = .993 sec      time to cross patch

a = (v2 - v1) / t = (6.5 - 8) / .993 = -1.51 m/s^2     or 1.5 m/s^2

The average velocity for the race is 7.25 m/s if and the acceleration is 1.5 m/s², and the time is 0.99 seconds.

It is defined as the rate of change in linear velocity with respect to time. It is also known as linear acceleration.

It is given that:

Coasting due west on your bicycle at 8 m/s, you encounter a sandy patch of road 7.2 m across.

The bicycle slows with constant acceleration.

As we know,

V = (v1 + v2)/2

Here V is the average velocity

v1 = 8 m/s

v2 = 6.5 m/s

V = (v1 + v2)/2 = (8 + 6.5)/2

V = 7.25 m/s    

t = 7.2/7.25

t = 0.993 sec      

a = (v2 - v1)/t = (6.5 - 8)/0.993

a = -1.51 m/s²    

a = 1.5 m/s²

Thus, the average velocity for the race is 7.25 m/s if the acceleration is 1.5 m/s², and the time is 0.99 seconds.

Learn more about linear acceleration here:

brainly.com/question/408236

#SPJ2

Answer:

Tension of rope T = 35.16 N

Explanation:

Given:

Mass of block = 8 kg

Wood of density = 696 kg/m³

Density of lead = 11,340 kg/m³

Find:

Tension in the string

Computation:

Volume of wood = Mass of block / Wood of density

Volume of wood = 8 / 696

Using Archimedes law

Mw + M  = (Vw + V) 1,000

8/1,000 + 11,340v = (Vw + V) 1,000

V = 3.47 x 10⁻⁴

Tension of rope T

T = v (11,340 - 1,000)9.8 N

T = (3.47 x 10⁻⁴)(11,340 - 1,000)9.8 N

Tension of rope T = 35.16 N

If the upper surface of the wood is just level with the water, the tension in the string is 34.2 Newton.

Mass of block of wood; \(m_w = 8.00kg\)

Density of wood; \(\delta _w = 696 kg/m^3\)

Density of lead; \(\delta _{Ld} = 11340 kg/m^3\)

Density of water; \(\delta _{water} = 1000kg/m^3\)

First we determine the volume of wood:

\(v_w = \frac{mass}{density} = \frac{m_w}{\delta w} = \frac{8.00kg}{696kg/m^3}\\\\v_w = 0.01149m^3\)

Now, using Archimedes principle:

Buoyancy force is determined using the equation:

\(F_b = V * \delta * g\)

Where:

We substitute our values into the equation

\(F_b = 0.01149m^3\ *\ 1000kg/m^3 * 9.8m/s^2\\\\F_b = 112.602 kg.m/s^2\\\\F_b = 112.602N\)

Now, buoyancy force \(F_b\) = Weight + Tension

\(F_b = mg + T\\\\T = F_b - mg\)

We substitute in our values

\(T = 112.602N - ( 8kg * 9.8m/s^2)\\\\T = 112.602N - 78.4kgm/s^2\\\\T = 112.602N - 78.4N\\\\T = 34.2N\)

Therefore, if the upper surface of the wood is just level with the water, the tension in the string is 34.2 Newton.

Learn more:  https://brainly.com/question/12924734

Answer:

ε = 2 V/cm

Explanation:

To calculate the mobility inside this bar, we just need to apply the expression that let us determine the mobility. This expression is the following:

ε = ΔV / L

Where:

ε: Hole mobility inside the bar

ΔV: voltage applied in the bar

L: Length of the bar

We already have the voltage and the length so replacing in the above expression we have:

ε = 2 V / 1 cm

The data of the speed can be used for further calculations, but in this part its not necessary.

Hope this helps

(i) The angle of inclination of the string to the vertical is 65⁰.

(ii) The tension in the string is determined as 2.11 N.

The angular speed of the string is calculated as follows;

ω = 2πN/60

ω = 2π x 80/60

ω = 8.38 rad/s

v = ωr

v = 8.38 x 0.3 m

v = 2.514 m/s

tanθ = v²/rg

tan θ = (2.514²) / (0.3 x 9.8)

tan θ = 2.15

θ = arc tan(2.15)

θ = 65⁰

T = mv²/r

T = (0.1 x 2.514²) / (0.3)

T = 2.11 N

Thus, the tension in the string is determined as 2.11 N.

Learn more about tension in string here: https://brainly.com/question/24994188

#SPJ1

1,000 J of energy are needed to melt 10 g of a solid substance that is already at its melting point ,  the heat of fusion of the substance is 548 joules .

Heat of fusion, also known as enthalpy of fusion or latent heat of fusion, is the amount of energy required to melt or freeze a substance under constant pressure conditions. When it comes to chemistry, "fusion" is basically synonymous with "melting." In the classroom, heat of fusion is typically used when a substance is at its melting or freezing point. In such instances, most people consider heat of fusion to be a constant.

Water, for example, has a heat of fusion of 334 J/g at its melting point of 0°C. At 0°C, one grams  of liquid water requires 334 Joules of energy to completely freeze into ice. In addition, one grams of ice requires 334 Joules of energy to melt entirely.

q = m×∆Hf

q: Total change in heat energy (in Joules)

∆Hf: Heat of fusion of substance (in Joules per gram)

m: Mass of substance (in grams)

To know more about fusion heat , visit ;

brainly.com/question/14053504

#SPJ1

Hi there!

Recall the following:

\(V \text{ (Electric Potential Energy) } = \frac{kq_1q_2}{r}\\\\F_E = \frac{kq_1q_2}{r^2}\)

k = Coulomb's Constant (Jm/C²)

q = Charge (C)
r = distance between charges (m)

To calculate the electric force between the two charges, we can simply divide by another 'r' (distance):

\(F_E = \frac{70}{0.049} = \boxed{1428.57 \mu J}\)

a) , it would take approximately 0.4638 seconds for the magnetic energy to decay to 13% of its maximum value.. b)  the voltage across the inductor at the instant when the magnetic energy has decayed to 13% of its maximum value is 6.4 times the initial current in the circuit.

An RL circuit consists of a resistor (R) and an inductor (L) connected in series. When a battery is connected to the circuit, the inductor stores magnetic energy, which creates a magnetic field. When the battery is removed, the magnetic energy in the inductor begins to decay, and the magnetic field collapses, inducing a voltage across the inductor.

a) The time constant (τ) of an RL circuit is given by the formula:

τ = L/R

where L is the inductance in henries, and R is the resistance in ohms. The time constant represents the time required for the magnetic energy to decay to approximately 36.8% of its maximum value.

In this case, L = 5 H and R = 22 ohms. Therefore, the time constant of the circuit is:

τ = L/R = 5 H / 22 ohms = 0.2273 seconds

To calculate the time required for the magnetic energy to decay to 13% of its maximum value, we can use the formula:

t = -ln(0.13) * τ

where ln is the natural logarithm. Plugging in the values, we get:

t = -ln(0.13) * 0.2273 seconds

t = 0.533 seconds

Therefore, it would take approximately 0.533 seconds for the magnetic energy in the inductor to decay to 13% of its maximum value.

b) To find the voltage across the inductor at that instant, we can use the formula:

V = L * di/dt

where V is the voltage across the inductor, L is the inductance, and di/dt is the rate of change of the current in the circuit.

At the instant when the magnetic energy in the inductor has decayed to 13% of its maximum value, the current in the circuit is given by:

I = I0 * e^(-t/τ)

where I0 is the initial current, and e is the mathematical constant approximately equal to 2.71828. Plugging in the values, we get:

I = I0 * e^(-0.533/0.2273)

I = 0.292 * I0

Therefore, the rate of change of current (di/dt) at that instant is given by:

di/dt = I / τ = (0.292 * I0) / 0.2273

Now, we can calculate the voltage across the inductor:

V = L * di/dt = 5 H * (0.292 * I0 / 0.2273)

V = 6.4 * I0 volts

For more such questions on magnetic energy visit:

https://brainly.com/question/26257705

#SPJ11

The converging lens  reflecting or refracting surface is depicted.

The center of this kind of lens is thicker than the edges. Two spherical surfaces often make up an optical lens. The lens is referred to as a biconvex lens or just a convex lens if those surfaces are curved outwards.

These lenses have the ability to focus an outside light beam to a spot on the opposite side by converging it. The focal length of the convex lens is the distance from the lens's center to this point, which is known as the focus.

Hence, the converging lens  reflecting or refracting surface is depicted.

Learn more about  convex lens here:

https://brainly.com/question/27038900

#SPJ1

Answer:

5

Explanation:

searched it up