what is the average acceleration?
Position (m) Velocity (m/s) 1.0 0.80- 0.60 0.40 0.20 0.0 1.0 0.80 0.60 0.40 0.20 0.0 0.0 0.0 1.0 1.0 2.0 2.0 3.0 3.0 4.0 Time (s) 4.0 Time (s) 5.0 5.0 6.0 6.0 7.0 7.0 " " 8.0 11 11 0 0 0 0 0 " " " " 1

Answer:

147 Joules

Explanation:

It would be potential energy because it is stored. Potential energy = gravity * mass * height. Gravity is 9.8 m/s² or more specific 9.807 m/s². Potential energy is written in Joules.

9.8 * 5 * 3 = 147 Joules

More specific:

9.807 * 5 * 3 = 147.105 Joules

The tensions T1 and T2 in the supporting wires is:

T1 = W (2h)/l tan θ + 1

T2 = W (l – 2h)/l

The figure below shows the rectangular sign and the forces acting on it:

Two wires are used to support the sign.

Let T1 and T2 be the tensions in wires AC and BD respectively.

The weight of the sign acts downward through the center of gravity G.

The wire AC is at an angle of θ with the horizontal while wire BD is vertical.

Resolving horizontally, we get

T1 cos θ = T2 cos θ …(1)

Resolving vertically, we get

T1 sin θ + T2 = W …(2)

Moment about D is zero.

Taking moments about D,

T2 (l/2) = W (l/2 – h) …(3)

From equation (3),

T2 = W (l – 2h)/l …(4)

From equations (1) and (4), we get

T1 = W (2h)/l tan θ + 1 …(5)

Total force supported at

C = T1 + T2

C = W (2h/l tan θ + 1 + (l – 2h)/l)

C = W (l + 2h tan θ)/(l tan θ) …(6)

The lateral force R supported at D is given by

R = T2 = W (l – 2h)/l …(7)

Hence, the tensions T1 and T2 in the supporting wires, the total force supported at C, and the lateral force R supported at D are as follows:

T1 = W (2h)/l tan θ + 1

T2 = W (l – 2h)/l

Total force supported at

C = W (l + 2h tan θ)/(l tan θ)

Lateral force R supported at

D = W (l – 2h)/l

R is positive if it points in the +y-direction, and negative if it points in the -y-direction.

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Answer:

wave w is a sound wave

wave x and y are light waves

Answer:

D

Explanation:

A circular wheel has a radius of 24 cm, a diameter of 48 cm, and a circumference of 3.14159 cm, or 150.8 cm, rounded to the nearest centimeter.

Definition. The circumference of a circle is the length measured around its edge. The diameter of a circle is the distance from the center to the outside. The radius of a circle is the distance between any two points on its edge.

A ring's diameter is equal to half of its diameter, or vice versa, meaning that the diameter of a circle is twice as long as the radius.

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Ultra = X-ray

Explanation:

how are things going to paint the roof for beginners painting and decorating the whole house so I'm going away with a few sports mates for a couple nights for beginners but will have a look painting at a time and see what is going to be Strong enough

The force applied to stretched the spring 3.2 m, given that the spring has a spring constant of 0.52 N/m is 1.664 N

Hooke's law gives a relationship betwee force, extension and spring constant according to the following formula:

Force (F) = Spring constant (K) × extension (e)

F = Ke

With the above formula, we can determine the force applied to the spring as illustrated below:

Force (F) = Spring constant (K) × extension (e)

Force applied (F) = 0.52 × 3.2

Force applied (F) = 1.664 N

Thus, we can conclude from the above calculation that the force is 1.664 N

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A hydrogen atom is in its ground state (nᵢ = 1) when a photon impinges upon it. The atom absorbs the photon, which has precisely the energy required to raise the atom to the nf = 3 state. (a) The photon's energy that was absorbed is approximately 1.51 eV (negative sign indicates absorption).(b)option B and C are correct.

To determine the photon's energy and the energies of photons that might be emitted when the hydrogen atom returns to the ground state, we can use the energy level formula for hydrogen atoms:

E = -13.6 eV / n^2

where E is the energy of the electron in the atom, and n is the principal quantum number.

(a) To find the energy of the photon that was absorbed by the hydrogen atom to raise it from the ground state (nᵢ = 1) to the nf = 3 state, we need to calculate the energy difference between the two states:

ΔE = Ef - Ei = (-13.6 eV / 3^2) - (-13.6 eV / 1^2)

Calculating the value of ΔE:

ΔE = -13.6 eV / 9 + 13.6 eV

= -1.51 eV

Therefore, the photon's energy that was absorbed is approximately 1.51 eV (negative sign indicates absorption).

(b) When the hydrogen atom returns to the ground state, it can emit photons with energies corresponding to the energy differences between the excited states and the ground state. We need to calculate these energy differences and check which values are present among the given options.

ΔE1 = (-13.6 eV / 1^2) - (-13.6 eV / 3^2) = 10.20 eV

ΔE2 = (-13.6 eV / 1^2) - (-13.6 eV / 4^2) = 10.20 eV

ΔE3 = (-13.6 eV / 1^2) - (-13.6 eV / 5^2) = 12.10 eV

ΔE4 = (-13.6 eV / 1^2) - (-13.6 eV / 6^2) = 12.10 eV

ΔE5 = (-13.6 eV / 1^2) - (-13.6 eV / 7^2) = 13.55 eV

ΔE6 = (-13.6 eV / 1^2) - (-13.6 eV / 8^2) = 13.55 eV

ΔE7 = (-13.6 eV / 1^2) - (-13.6 eV / 9^2) = 13.55 eV

Comparing the calculated energy differences with the given options:

(A) 1.89 eV: This energy difference does not match any of the calculated values.

(B) 12.1 eV: This energy difference matches ΔE3 and ΔE4.

(C) 10.2 eV: This energy difference matches ΔE1 and ΔE2.

(D) 13.6 eV: This energy difference does not match any of the calculated values.

Therefore option B and C are correct.

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Answer: the displacmen is 2 blocks north

Explanation:

Answer:

Lol, yes

Explanation:

Answer:

31.15%

Explanation:

The formula used was

((Work output)/(Work input))×100

Answer:

C.  31.1 percent

Answer:

Explanation:

nuclear fusion?

Answer:26.7 and 7.4

Explanation:

So, first you add all the time up then the area travelled.

Firstly; 45 mins + 300 minutes(5 hours) + 165 minutes(2.75 minutes)= 510 minutes

Secondly; 42.2KM + 180.5KM + 3.86KM= 226.56KM

Finally: For hourly you would do: 510 divided by 60 to get 510 mins in terms of hours: so, 8.5 hours then you would do 226.56KM divided by 8.5 hours to get: 26.7Km/hr

For m/s: 7.4m/s

Answer:

The dynamo has a wheel that touches the back tyre. As the bicycle moves, the wheel turns a magnet inside a coil. This induces enough electricity to run the bicycle's lights. The faster the bicycle moves, the greater the induced voltage - and the brighter the lights.

Because of the bicycle's actions, the wheel turns a magnet internal a coil. This induces enough strength to run the bicycle's lighting fixtures. The faster the bicycle movements, the greater the caused voltage - and the brighter the lights.

A trendy dynamo creates an instantaneous modern-day (DC) – a one-directional waft of electrical rate. A bicycle dynamo creates an alternating current (AC), which reverses course from time to time.

A dynamo is a tool normally positioned inside the hub of a motorcycle's wheel that converts the energy generated by means of the wheel spinning to electric power. That energy is then used to run front and rear dynamo lights at the bike, offering constantly-on illumination without the want to change the lighting.

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Explanation:

HELP PLS

Hang time is the time it takes to reach the peak of your jump.

False

Answer:

between a ball and a car

Explanation:

lol i am just as baffled as you luv

Answer:

The mass of the squirrel is 0.51kg

A squirrel runs at a speed of 9.9 m/s with 25 J of kinetic energy.

What is the squirrel’s mass?

Answer: 0.51 kg

Conductors are materials that allow electrical charges to flow through them easily, such as metals, while insulators are materials that resist the flow of electrical charges and do not conduct electricity, such as rubber or plastic.

Conductors and insulators are two types of materials with very different electrical properties. Conductors allow electricity to flow freely through them, while insulators prevent the flow of electricity. Conductors have a low resistance to electrical flow, while insulators have a high resistance.

Examples of conductors include metals like copper and aluminum, as well as water and human tissue. Examples of insulators include rubber, plastic, glass, and air. Conductors are commonly used in electrical wiring and circuits, while insulators are used to protect people and equipment from electric shocks and to prevent electrical interference.

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The production function will have constant returns to scale if 2αβ = 1

Constant returns to scale (CRS) implies that if all inputs increase by a factor of λ, the output increases by λ as well. The requirement for constant returns to scale (CRS) in a Cobb-Douglas production function with a new input factor is given by the sum of exponents on all variables equal to 1.

In this case, Y = AKαLβMγ.

Thus, we have that α + β + γ = 1 for constant returns to scale in K, L, and M, because the sum of the exponents is 1.

If the sum of the exponents is less than 1, it indicates decreasing returns to scale. If the sum of the exponents is greater than 1, it indicates increasing returns to scale. If we take γ = 0, we obtain the production function used in class, which is Y = AKαLβ, thus α + β = 1 for constant returns to scale in K and L.

When γ = 0, the answer we get is consistent with what we learned in class. Now, we consider the constant elasticity of substitution (CES) technology, where Y = [aKα + bLα]β. The production function will have constant returns to scale (CRS) in K and L if the sum of the exponents of K and L is equal to 1.

Therefore, αβ + αβ = 1, implying 2αβ = 1.

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Answer:

no change

Explanation:

The Newton's Second Law of motion states that when an unbalanced force is applied to an object, it causes an accelerated motion in the object, in the direction of the unbalanced force. So, if there is no unbalanced force, then there is no motion. In this case both the forces have same magnitude and opposite direction. Therefore, the unbalanced force will be zero:

Unbalanced Force = Upthrust - Weight

Unbalanced Force = 2448 N - 2448 N

Unbalanced Force = 0 N

hence, there will be no motion in the vertical direction. Therefore, the correct option is:

no change

Answer:

Explanation:

The main equation to solve this is F = ma, where F is the force applied to the brakes with respect to its acceleration. We have the mass that we need, but we do not have the acceleration. That's the first thing we have to find. However, our velocity needs to be stated in m/s and right now it's in km/h. Converting that:

\(90\frac{km}{hr}*\frac{1000m}{1km}*\frac{1hr}{3600s} =25\frac{m}{s}\) Now we're ready to find the acceleration:

\(a=\frac{v_f-v_0}{t}\) where the top line there translates to the final velocity minus the initial velocity.

\(a=\frac{0-25}{3.0}\) so the acceleration is -8.3 m/s/s

We can use that now in the force equation above:

F = 1200(-8.3) and

F = -1.0 × 10⁴ N (that's 10,000 N to the correct number of sig dig's; the negative sign means that the force is being applied in the direction opposite to that which the van is currently moving)

Answer:

The rod gets heated up through conduction

Explanation:

Answer:

47.48 J/g/K or 4.74 × 10⁴J/Kg/K

Explanation:

C(specific heat capacity)= Q(quantity of heat)/M(mass) × ∆T(change in temperature, Kelvin)

Q= 8000J

M= 46g or 46 ×10^-3Kg

T1= 24°C = 297K

T2 = 28°C = 301K

∆T = 301-297

= 4K

C= 8000/46 × 4

= 47.48 J/g/K or 4.74 × 10⁴J/Kg/K

Observations in our solar system support the conclusion that collisions between portions of material in the solar system cancel their up-and-down motions, leaving them revolving in a thin disk around the Sun. Observations do not support the conclusion that objects in the far outer solar system orbited so slowly that they would have experienced few collisions, leaving behind small, solid bodies.

The Nebular Condensation Theory proposes that our solar system is formed from a rotating disk of gas and dust called the solar nebula. According to this theory, collisions between portions of material in the solar system canceled their up-and-down motions, resulting in a thin disk of material revolving around the Sun. Observations of our solar system, such as the flattened shape of the planetary orbits and the presence of a protoplanetary disk around young stars, support this conclusion.

Additionally, observations suggest that large collisions can change the rotation directions of planets. This is evident in the case of Uranus, which has an extreme axial tilt likely caused by a past collision. Other examples of planets with tilted axes or unusual rotation patterns also support this conclusion.

However, observations do not support the conclusion that objects in the far outer solar system orbited slowly enough to experience few collisions, resulting in small, solid bodies. Instead, the outer solar system is known to contain a significant population of icy objects, such as dwarf planets and comets, which have likely experienced numerous collisions throughout their history. These collisions have shaped their orbits, compositions, and sizes.

Overall, while some conclusions of the Nebular Condensation Theory plus collisions are supported by observations in our solar system, others do not find substantial evidence in favor.

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The pressure of the 0.130 g helium gas sample in a 649 mL container at 32°C is approximately 150 mmHg.

To calculate the pressure, we can use the ideal gas law formula: PV = nRT. First, we need to convert the given values to their respective units: mass (m) = 0.130 g, volume (V) = 649 mL = 0.649 L, and temperature (T) = 32°C = 305 K.  

Next, determine the number of moles (n) using the molar mass of helium: n = m/M, where M = 4.00 g/mol (for helium). Thus, n = 0.130 g / 4.00 g/mol ≈ 0.0325 mol.  

Now, substitute the values into the ideal gas law formula, and solve for pressure (P): P = (nRT)/V = (0.0325 mol × 0.0821 L·atm/mol·K × 305 K) / 0.649 L ≈ 1.98 atm.  

Finally, convert the pressure to mmHg: 1.98 atm × (760 mmHg/1 atm) ≈ 150 mmHg (to three significant figures).

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According to the law of conservation of momentum, the total momentum of a system remains constant if no external forces act on it the total momentum of the system before and after the collision will be conserved. The correct option d.

The law of conservation of momentum states that in a closed system, the total momentum before a collision is equal to the total momentum after the collision, provided there are no external forces acting on the system. The law applies to both linear and angular momentum.

In the given scenario, the total momentum of the system before the collision is the sum of the momenta of the two disks. After the collision, the total momentum of the system should still be the same as before the collision if no external forces are present.

The individual velocities and directions of the disks after the collision may change, and they may continue to move at different velocities or even come to rest. The law of conservation of momentum does not dictate the velocities or outcomes of the individual objects involved in the collision. It only states that the total momentum of the system remains constant.

Therefore, option d) The total momentum of the system before and after the collision will be conserved is the correct statement according to the law of conservation of momentum.

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Answer:

right

Explanation:

The best pie crust is a perfect balance between fat, flour, and liquid.  is

To make a perfect pie dough .

"Pie" was the word for a magpie before it was a word for a pastry, from the Latin word for the bird, Pica (whence the name of the disorder that makes you eat weird things). Pica morphed into "pie" in Old French, following the proud French tradition of actually pronouncing as few consonants as possible.

pie, dish made by lining a shallow container with pastry and filling the container with a sweet or savoury mixture. A top crust may be added; the pie is baked until the crust is crisp and the filling is cooked through.

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The ideal proportion of oil, flour, and liquid goes into making the greatest pie crust. is to create the ideal pie dough.

Before it became a term for a baked food, "pie" was the Slang phrase for bird, Pix (whence the name of the disorder that makes you eat weird things). Following their noble French custom of genuinely speaking as few letters as possible, pica evolved into "pie" during Old French.

Pie is a dish that is created by lining the shallow dish with dough and filling it with either a sweet or spicy combination. Its pie is heated until the filling is heated all the way through and the top crust is crunchy.

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The SI unit of wavelength of a wave is meters (m).

Curare is a paralyzing poison that functions as an antagonist of the acetylcholine receptor, which causes muscle paralysis.

It is a potent toxin that is derived from the bark of a South American plant, which has traditionally been used by native hunters as a tool to immobilize their prey before killing them.

Curare acts as an antagonist of the acetylcholine receptor. This means that it blocks the binding of acetylcholine, a neurotransmitter that is responsible for stimulating muscle contractions, to its receptor sites on the muscle membrane. This prevents the muscle from contracting and causes paralysis.

Antagonists are compounds that bind to a receptor site but do not activate it. Instead, they block the normal activity of the receptor, either by competing with an endogenous ligand or by physically blocking the receptor site.

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