At what temperature will wood and iron apper equally hot or equally cold to our body?

Dark energy has been hypothesized to solve The expansion of the universe is accelerating.

Functional behavioural assessment, or FBA for short, is used to examine a student's behaviour in order to determine the fundamental driving force behind the behaviour.As they apply the scientific method to learn more about the world, hypotheses are the questions that scientists ponder. People also employ the procedure of forming then attempting to refute a hypothesis in their daily lives. The purpose of the hypothesis is to organise the process of comprehending how the world operates. After the behaviour has been identified and information about the circumstances surrounding the student's activities has been gathered, the next step is to construct a hypothesis, which is a declaration that enumerates the conduct, what came before it, and its presumed purpose.

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If a refrigerator operates on average for 10.0 h a day if the power rating of the refrigerator is 700 Watts, then the electrical energy consumed by the refrigerator in one day would be 25200-kilo Joules .

The rate of doing work is known as power. The Si unit of power is the watt.

Power = work / time

As given in the problem If a refrigerator operates on average for 10.0 h a day if the power rating of the refrigerator is 700 Watts,

The electrical energy consumed by = power × time

                                                           = 700 × 10 × 3600

                                                           = 25200000 Joules

                                                           = 25200-kilo Joules

Thus, the electrical energy consumed by the refrigerator would be 25200-kilo Joules.

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When air expands it is warm outside then the air is contracted and becomes cool.

The atmosphere of Earth or also known as air is the layer of gases retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere.

When warm air expand,  the molecules heat and move faster makin them to move apart. So we know that air expands when heated and contracts when cooled, the reason for that is because there is more space between the molecules, the air is less dense than the surrounding matter and the hot air floats upward.

Atmospheric convection helps us to understand that as air heats up and becomes less dense, it rises higher into the air. As it reaches higher elevations, it encounters less air pressure. The lower air pressure at higher elevations allows the air to expand even more. As this air continues to expand, it begins to cool down.

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n= log(Ra/Rt)/log(Imin/Imax) ;= log(0.05/0.357)/log(350/700)= 2.84

3 stages of starting resistances

A circuit's opposition to current flow is measured by its resistance. The Greek letter omega () stands for ohms, which are used to measure resistance. Georg Simon Ohm (1784–1854), a German physicist who examined the connection between voltage, current, and resistance, is the subject of the name "Ohm." Many parts have a set resistance value, including heating elements and resistors. In manuals or on nameplates of components, these values are frequently printed for reference.

If there is a tolerance listed, the measured resistance value must fall within the given resistance range. A issue is typically indicated by any appreciable change in a fixed-resistance value.

Although the word "resistance" may sound bad, it has positive uses in electricity. In an active circuit, resistance cannot be measured.

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Therefore, the current mass will be 0.0017002 times the sample's initial mass.

Given:

half life of the sample in question, t^=5 x 108 years

We are aware that the solar system formed roughly 4.6 x 109 years ago.

Let the starting amount for the solar system's formation sample be, mo

The current ultimate quantity would then be:

m = mo x (1/2) (t^/t)

m= mo x (1/2) 4.6 x 10^9/(5x10^8)

m= mo x 0.0017002

Therefore, the current mass will be 0.0017002 times the sample's initial mass.

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The distance covered by Tiana is greater than the distance covered by the brother.

Distance is defined as the quantity that defines how far or near an object is from an observer which is normally measured in meters, kilometers and feet.

There are various ways by which distance can be measured which include the following:

From the scenerio created concerning Tiana and the brother, Tiana first left the doctors office to her friends house and they both left together to the school.

This shows that the distance covered by Tiana is greater than the distance covered by her brother.

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Answer:

10 floors

Explanation:

We are told that a bell of mass 20 kg is atop a tower and has 8829 J of gravitational energy. The question asks us to estimate the number of floors the tower has.

To do this, we must first calculate how high above the ground the bell is. We can do that using the formula for gravitational potential energy:

[tex]\boxed{g.p.e = mgh}[/tex],

where:

• g.p.e = gravitational potential energy (8829 J)

• m = mass of object (20 kg)

• g = acceleration due to gravity (approximately 10 m/s²)

• h = height of object above ground (? m).

Using the above information and formula, we can solve for h:

g.p.e = [tex]20 \times 10 \times h = 8829[/tex]

       ⇒ [tex]200 h = 8829[/tex]

       ⇒ [tex]h = \frac{8829}{200}[/tex]

       ⇒ [tex]h = \bf 44.145 \ m[/tex]

Therefore the bell is 44.145 m above the ground, which means that the height of the tower is also 44.145 m.

One floor of a building can be estimated to be around 4.3 m, therefore the number of floors the tower has is:

44.145 ÷ 4.3

≈ 10

Therefore there are 10 floors in the tower.

31.257 radian  is the drill's angular displacement during that time interval.

initial angular speed  ω0 = 5.27 rad/sec , ang.acceleration  α = 0.399 rad/s2 , time t = 4.99 sec

angular displacement

θ = ω0 t + 1/2×αt^2

solving we get

θ = 31.257 rad

The angle at which a point revolves about a center or a line around a certain axis is known as the angular displacement of a body. We cannot examine a body's motion as a particle when it is moving or being rotated on its axis.

Rotational motion is the movement of a rigid body about a fixed axis. When the body or item is thought of being rigid, dealing with rotation is made simpler and easier. At every moment (t), the item experiences a change in acceleration and velocity similar to circular motion.

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Answer:

Explanation:

Given:

F = 350 N

g = 10 m/s²

___________

m - ?

m = F / g = 350 /  10 = 35 kg

A common occurrence is the collision of a moving object with another object, after which both objects stick together. Because there is no bounce, such a collision is referred to as inelastic.

Inelastic collisions occur when kinetic energy is lost. An elastic collision, on the other hand, is one in which the kinetic energy after is equal to the kinetic energy before. Inelastic collisions occur when there is some "bounce" but the final kinetic energy is less than the initial kinetic energy. A collision with no bounce is sometimes referred to as completely inelastic. Collisions that are completely inelastic result in the objects sticking together and lose the most kinetic energy.

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a. Expression for magnitude of the acceleration is GM/16R² b. magnitude of the acceleration is 1.33 e^-5 ms^-2 .

Because the direction is always shifting, motion on a circle accelerates even while the speed is constant. Both effects add to the acceleration for all other types of motion. It is a vector quantity because acceleration has both a magnitude and a direction. Another vector quantity is velocity. The velocity vector change during a certain period of time, divided by that period of time, is the definition of acceleration. Acceleration requires a change in speed, direction, and rate of change. An object experiences constant acceleration when its velocity changes at the same rate every second. Whether an object is accelerating or decelerating determines the direction of acceleration. The force of gravity causes an item in free fall to fall. An object has positive acceleration when it is going faster than it was previously. Positive acceleration was demonstrated by the moving car in the first scenario. The acceleration is in the same direction as the car's motion since the vehicle is moving ahead and accelerating.

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I'm guessing that you need the force, since the question doesn't specify I'll just use the force equation. If this is not what you wanted let me know in the comments section of this answer.

- F = 300 x 4

- F = 1200 N (newtons)

This acceleration will be expressed in decimal terms as 1.8 m/s square, and the direction of this investigation will be downhill and vertical.

There is an elevator, and it weighs a whopping 5000 kg. assuming that it has also been revealed that the elevator is supported by a cable. And it has been noted that the 40,000 newtons of tension in the wire holding this elevator. Four into ten is thus equal to four newtons. Additionally, we must ascertain the elevator's magnitude and acceleration. So let's think about E. S. The acceleration that we must here calculate. Wheat will therefore follow the accelerator and will be moving downward. We multiply mass by the gravitational acceleration to obtain weight.

The mass is 5000, then. This is multiplied by 9.8 To obtain the weight of 49,000 Newtons, it is necessary to apply 40,000 Newtons of tension. Therefore, it can be seen that the downward force is greater than the tension. Therefore, we can infer that the acceleration in this case will be in the downward direction and that the net force will also be in that direction. Additionally, the mass of the accelerator will be divided by the net force to get the acceleration. So let's start by calculating the net force. Therefore, that will be MG – t. And according to Newton's second law, this will be equal to mass times the acceleration.

Therefore, from this point on, we will receive 9000 when we subtract the tension from the weight. And when we divide by 5000, which is the elevator's mass, we arrive at the acceleration, which works out to be roughly nine by five m per second square. The acceleration will be expressed in decimal terms as 1.8 m/s square, and this exploration will be conducted vertically downward.

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The change in temperature in kelvin, given that the system was heated from 5 °C to 10 °C is 278 K

We'll begin by obtaining the change in temperature in degree Celsius. This can be obtained as follow:

ΔT = T₂ – T₁

ΔT = 10 – 5

ΔT = 5 °C

Finally, we shall convert 5 °C to unit in kelvin. This can be obtained as follow:

T(K) = T(°C) + 273

T(K) = 5 + 273

T(K) = 278 K

Thus, from the above calculation, we can conclude that the change in temperature is 278 K

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Answer:

Vy = V0 * sin θ          vertical speed

Vy = 30 m/s * sin 29 = 14.5 m/s

t = 14.5 m/s / 9.8 m/s^2 = 1.48 sec         time to reach max height

H = Vy t - 1/2 g t^2       acceleration is in opposite direction to initial Vy

H = 14.5 m/s * 1.48 s - 1/2 * 9.8 m/s^2 * (1.48 s)^2

H = 10.7 m

Answer:OB=58.3m

Explanation:

So here cow wanders 30m in north and turns 22 degrees in right side and moves 40m more, as shown in figure given.

now take the starting point as a origin such that cow moves in x-y co-ordinate axis.

As shown in figure length OA is the length when cow moves in north or y direction. Later she takes 22 degrees turn to right and moves 40m more.

So the final displacement is the length of cow from the origin that is length OB.

now co-ordinates of B are [40cos22°,40sin22°+30] i.e [37.084,44.984]

now displacement of cow= length of OB

                                           = [tex]\sqrt{[37.084]^{2}+[44.984]^{2} }[/tex]

                                           =[tex]\sqrt{3398.78}[/tex]

                                     OB =[tex]58.3[/tex]

The speed of the object is 3.0m/s and the direction is equal to the direction of its initial velocity.

Given:
mass of the object m=2.0kg
object's constant velocity before the action of the force v0=1.0m/s 

From the graph of the force against time,
we can see that the force is constant (F=8.0N)
and it only acts for Δt=0.5s in the same direction of the object's motion (positive direction, to the right).

Now, using impulse-momentum theorem,
J=Δp
The impulse of the force equals the variation in the object's linear momentum.

In scalar form, along the motion's direction, we can write:
FΔt=Δp

The variation in the linear momentum equals: FΔt=mvf−mv0,
where: vf is the unknown final velocity.
Solving for vf, we have:
vf=8.0N⋅0.5s2.0kg+1.0m/s
= 3.0m/s

The object's velocity after the force ends equals 3.0 m/s, moving to the right.
The force increases the velocity of the object because it acts in the same direction as the initial velocity.

Therefore, the object's speed is 3m/s and the direction is the same direction as the initial velocity.

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Answer:

A.BB is 000 with A.B is 0.00

If the first runner wants to stay side-by-side with the second runner, The angular velocity needs to be the same as they would then cover equal angular distance for a period of time.

An equal angular distance means that it would always be side to side.In order to do this, the first runner needs to run at a faster speed than the second runner. This is because the second runner is running in a larger circle than the first runner, so she covers more ground in the same amount of time. The first runner needs to make up for this by running at a faster speed.

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The earth's acceleration toward the apple is 6.064×10⁻²⁵ m/s²

What is acceleration?
The rate at which an object's velocity with respect to time changes is referred to as acceleration in mechanics. It is a vector quantity to accelerate (in that they have magnitude and direction). The direction of the net force acting on an object determines the direction of its acceleration. According to Newton's Second Law, the amount of an object's acceleration is the combined result of two causes:

The amount of the net resultant force, which is directly proportional to the sum of all external forces acting on that object;
Depending on the materials used to create it, an object's mass is inversely related to its magnitude.

Force on earth = 0.37×9.8 = 3.626N.

Acceleration of earth = 3.626/5.98×10²⁴ = 6.0635×10⁻²⁵  m/s²

Therefore, The earth's acceleration toward the apple is 6.064×10⁻²⁵ m/s²

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Answer:

when he shot a beam of alpha particles at a sheet of gold foil, a few of the particles were deflected. He concluded that a tiny, dense n)ucleus was causing the deflections. SO the 3rd option :)

Explanation:

its like 4 a_m r)n why am i on brainly id_k have a nice day !

Given data:

* The mass of the roller coaster is m = 800 kg.

* The total mechanical energy is E = 392000 J.

* The kinetic energy at the particular height (let h') is K = 92000 J.

Solution:

The potential energy of the roller coaster at h' is,

The potential energy in terms of height and mass is,

where g is the acceleration due to gravity,

Substituting the known values,

Thus, the height of the roller coaster from the ground is 38.3 meters.

The horizontal component of force in the flanged join and the indicator of whether the joint is in the tension of compression are

This is further explained below.

Generally,

[tex]A_1 Y_1=A_2 V_2 \\\\ A_1=\frac{\pi}{4}(0.30)^2, A_2=\frac{\pi}{4}(0.15)^2, \quad V_1=1.5 \mathrm{~m} / \mathrm{s}\end{gathered}\\ \\$eqn $A_1 V_1 &=A_2 V_2 \\\\ \frac{\pi}{4}(0.30)^2 \times(1.5) &=\frac{\pi}{4}(0.15)^2 V_2 \\\\\frac{\pi}{4}(0.09) \times(1.5) &=\frac{\pi}{4}(0.0225) V_2 \\[/tex]

0.07 *1.5 =0.01767 V_2

0.106 =0.01767 V_2

V_2 =0.10610 .01767

[tex]V_2=5.998 \approx 6m/s[/tex]

By moment Equation

[tex]\begin{aligned}&\quad \sum F_x=n^{\circ}\left(V_2 x-V_1 x\right] \\\\&P_x+P_1 A_1=\left(P_1 A_1 V_1\right)\left[V_2 \cos 30^{\circ}-V_1\right] \\\\&P=15 \mathrm{k} \quad 1000 \mathrm{~kg} / \mathrm{m}^3, V_1=10^3, A_1=\frac{\pi}{4}(0.30)^2, V_1=1.5 \mathrm{~m} / \mathrm{s} / \mathrm{s}\end{aligned}[/tex]

[tex]P=100kg/m^3 , V_2=6m/s[/tex]

[tex]\begin{aligned}R_x+P_1 A_1=\left(P A_1 V_1\right)\left[V_2 \cos 30^{\circ}-V_1\right] \\\\R_x+\left(15 \times 10^3\right)\left(\frac{\pi}{4}(0.30)^2\right) &=\left(1000 \times \frac{\pi}{4}(0.30)^2 \times 1.5\right)(6 \cos 30-1.5) \\\\R_x+\left(15 \times 10^3\right)(0.07) &=(1000 \times 0.106)(5.196-1.5) \\\\R_x+1050 \quad &=(106)(3.696) \\\\R_x &=391.776-1050 \\\\R_x &=-658.224\end{aligned}[/tex]

In conclusion, Hence the sign is negative, which means the force acts to the left.

Therefore, the force is compression

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CQ is attached below

ANSWER:

Sphere B

STEP-BY-STEP EXPLANATION:

The time of the air depends on the mass, initial velocity and the height of the object, having the same mass and the same height, it depends only on the initial velocity.

The higher the initial velocity, the shorter the time in the air, therefore in this case the sphere B that has a lower velocity will be the one that will spend the longest time in the air.

It takes her 4.17s to complete 10 dribbles as frequency is 2.40hz

What do you mean by frequency ?

In physics, frequency is the number of waves that pass a fixed point in a unit of time as well as the number of cycles or vibrations that a body in periodic motion experiences in a unit of time .A body traveling in periodic motion is considered to have experienced one cycle or one vibration after passing through a series of circumstances or locations and then returning to its starting point.. The frequency is 2 per second if the period, or time interval, needed to complete one cycle or vibration is 1/2 second; it is 100 per hour if the duration is 1/100 of an hour. In most cases, the frequency is equal to the period, or time interval, reciprocally, therefore frequency = 1/period = 1. (time interval)

frequency = 2.40hz

2.40 dribble is finished in one second

1 dribble takes 0.60 seconds to complete.

10 dribbles are finished in 1*10/2.40 = 4.17 seconds.

She completes 10 dribbles in 4.17 seconds since the frequency is 2.40 hertz.

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Answer: 1.62 m/s

Explanation:

Distance/time=speed

12 hours in minutes is 720

12x60=720

720 minutes in seconds is 43200

720x60=43200

70000/43200=1.62037

1.62 m/s

The a3=MT2 is a variant of Kepler's third law. Where a denotes the semi-major axis distance in AU, M the central body mass in solar masses, and T the orbital period in years.

These are Jupiter's largest moons, and they were the first four discovered beyond Earth in 1610 by astronomer Galileo Galilei. The mass of Jupiter can be calculated by studying the motion of one of these moons and applying Kepler's third law and Newton's law of universal gravitation. Sending a spacecraft to a planet and measuring the acceleration due to gravity as the spacecraft passes by it is the most accurate way of measuring its mass.

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The resistance of the coil  R IS 12.435Ω  and The length of the wire that is calculated from R= ρL/A is L = 1.97 m.

Electrical resistance is a force that opposes the flow of current and is hence resistance to electricity. In this sense, it acts as a gauge for the difficulty of current flow. Ohms () are used to measure resistance.

Electricity will flow from high to low when there is an electron difference between two terminals. In opposition to that flow is resistance. The current decreases with increasing resistance. Conversely, the higher the current, the lower the resistance. In theory, resistance is affected by the kind, temperature, and length of the material through which the electricity is flowing. Metals generally have low electrical resistance, which varies depending on the type of metal, which makes electricity flow through them more easily.

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The average force exerted as the displacement from 0 to x changes is 12kx. W = 12kx² is the work done when stretching or compressing a spring a distance x from its equilibrium position.

The Hooke's Law Calculator employs the formula Fs = -kx, where F is the spring's restoring force, k is the spring constant, and x is the displacement, or distance the spring is stretched. Hooke's Law states that when a spring is stretched, the force exerted is proportional to the increase in length from the equilibrium length. The spring constant can be calculated as follows: k = -F/x, where k is the spring constant. The Young's modulus (E) is a material property that indicates how easily it can stretch and deform. It is defined as the ratio of tensile stress () to tensile strain ().

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