The wheels of a skateboard roll without slipping as it accelerates at 0.40 m/s2 down an 85-m-long hill. Part A If the skateboarder travels at 1.8 m/s at the top of the hill, what is the average angular speed of the 2.6-cm-radius wheels during the entire trip down the hill

Answer:

c = 3.00E8 m/s      speed of light

c = f * λ        frequency ^ wavelength

f = c / λ  = 3.00E8 m/s / .01 m = 3.00E10 / sec

f = 30,000,000,000 /sec

Answer:

24 m/s

Explanation:

V=Vi+at

given initial velocity is 0, acceleration is 2 and time is 12 sec

find final velocity by plugging in the variables into the equation above.

V=0+2x12=24m/s

Answer:

a.

Explanation:

i did a quizz for it im sorry if im wrong

The displacement x = -0.098 m

The maximum potential energy of the block  = 0.049 J

The maximum kinetic energy of the block = 0.075 J

The maximum velocity of the block  = 0.73 m/s

The velocity of the block at a distance of half the amplitude.= 0.60 m/s

To solve this problem, we will use the equations of motion for a mass-spring system.

The frequency of oscillation is given by:

f = 1/2π * √(k/m)

where

f is the frequency of oscillation, k is the spring constant, and

m is the mass of the block.

The force exerted by the spring is given by:

F = -kx

where

F is the force,

k is the spring constant, and

x is the displacement from the equilibrium position.

a. To find the displacement x, we can use the force equation:

1.0 N = -kx

using the equation for frequency:

1.2 Hz = 1/2π * √(k/0.28)

Solving for k, we get:

k = (1.2*2π)^2 * 0.28

k = 10.17 N/m

Now we can solve for x:

1.0 N = -(10.17 N/m) * x

x = -1.0 N / (10.17 N/m)

x = -0.098 m

b. The maximum potential energy of the block occurs at the maximum displacement from equilibrium, which we can find using the displacement x we just calculated:

= (1/2)kx^2 = (1/2)(10.17 N/m)(-0.098 m)^2 = 0.049 J

c. The maximum kinetic energy of the block occurs at the equilibrium position, where the velocity is maximum:

K_max = (1/2)mv^2

We can find the velocity using the frequency and the displacement:

v_max = 2πf * |x| = 2π(1.2 Hz)(0.098 m) = 0.73 m/s

Plugging in the values,

K_max = (1/2)(0.28 Kg)(0.73 m/s)^2 = 0.075 J

d. The maximum velocity = 0.73 m/s

e. To find the velocity of the block at a distance of half the amplitude, we can use the conservation of energy:

K_max + U_max = (1/2)kx^2 + (1/2)mv^2

At half the amplitude, the displacement is x/2:

K_max + U_max = (1/2)k(x/2)^2 + (1/2)mv^2

Solving for v, we get:

v = √[(K_max + U_max - (1/2)k(x/2)^2)/(1/2)m]

Plugging in the values, we get:

v = √[(0.075 J + 0.049 J - (1/2)(10.17 N/m)((-0.098 m)/2)^2)/(1/2)(0.28 Kg)]

v = 0.60 m/s

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Answer:

Centripetal Force = 483.3 N

Explanation:

A centripetal force is the force that tends to keep a mocing object along a curved path and it is directed towards the centre of the rotatio, while centrifugal force is an apparent force that tends to force a rotating object away from the center of the rotation.

The formula for centripetal force is given by:

\(F_c = \frac{mv^2}{r} \\where:\\F_C = centripetal\ force\\m = mass\ = 22kg\\\omega =angular\ velocity = 40.0\ rev/min\)

Let us work on the angular velocity (ω), by converting to radians/ seconds

ω = 40 rev/min,

1 rev = 2π rad

∴ 40 rev = 2π × 40 rad = 80π rad

1 min = 60 seconds

\(\therefore\ 40\ rev \slash min = \frac{80\ \times\ \pi\ rad}{60\ seconds} \\40\ rev \slash min = 4.189\ rad \slash sec\)

Next let us find the velocity (v) from the angular velocity. Velocity (v) and angulsr velocity (ω) are related by the equation:

v = ω × r (m/s)

v = 4.189 × 1.25

v = 5.24 m/s

Finally, the centripetal force is calculated thus:

\(F_c = \frac{mv^2}{r} \\\\F_c = \frac{22 \times (5.24)^2 }{1.25} \\\\F_c = \frac{604.07}{1.25}\\ F_c = 483.3N\)

Angle of deviation can be defined as the angle between the incident ray and the emergent ray when light passes through a prism.

When speaking of Angle of deviations, the incident ray is the ray of light that hitss the prism, while the emergent ray is the ray of light that emerges from the prism.

The angle of deviation is noted to be always greater than zero, and it can be used to calculate the refractive index of the prism.

The angle of deviation can be calculated using δ = i + r - A

δ is the angle of deviation

i is the angle of incidence

r is the angle of refraction

A is the angle of the prism

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Answer: The scenario violates the second law of thermodynamics.

Explanation: The second law states that heat cannot be converted into work without some loss of usable energy, and that the amount of usable energy in a closed system will always decrease over time. Therefore, the machine described in the scenario cannot exist because it would violate the second law by converting all of the heat into electricity without any loss of usable energy.

Answer:

\(\huge\boxed{\sf x = 18\°}\)

Explanation:

If ∠ABC and ∠DEF are complementary angles, this means they add up to 90 degrees.

So,

∠ABC + ∠DEF = 90°

72 + x = 90

Subtract 72 to both sides

x = 90 - 72

x = 18°

\(\rule[225]{225}{2}\)

(a)  The work done by the force of gravity from A to B is 4.41 Joules.

(b)  The work done by the force of gravity from B to C is zero.

(c) The work done by the force of gravity from A to C is 4.41 Joules.

a) To calculate the work done by the force of gravity from A to B, we need to consider the change in potential energy. The potential energy at point A is maximum due to the maximum angle of 35.0∘ to the left of vertical, while at point B, the string is vertical, and the potential energy is zero.

The change in potential energy (ΔPE) is given by:

ΔPE = m * g * h

where m is the mass of the sphere (0.500 kg), g is the acceleration due to gravity (9.8 m/s^2), and h is the change in height.

Since the potential energy at point A is maximum, the change in height is equal to the length of the string (0.900 m).

ΔPE = 0.500 kg * 9.8 m/s^2 * 0.900 m = 4.41 J

Therefore, the work done by the force of gravity from A to B is 4.41 Joules.

b) From B to C, the change in height is zero since the string is already vertical. Hence, the work done by the force of gravity from B to C is zero.

c) The total work done by the force of gravity from A to C is the sum of the work done from A to B and from B to C.

Total work = Work from A to B + Work from B to C = 4.41 J + 0 J = 4.41 J

Therefore, the work done by the force of gravity from A to C is 4.41 Joules.

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I think it is the question:

A Pendulum Is Made Up Of A Small Sphere Of Mass 0.500 Kg Attached To A String Of Length 0.900 M. The Sphere Is Swinging Back And Forth Between Point A, Where The String Is At The Maximum Angle Of 35.0∘ To The Left Of Vertical, And Point C, Where The String Is At The Maximum Angle Of 35.0∘ To The Right Of Vertical. The String Is Vertical When The Sphere Is At

A pendulum is made up of a small sphere of mass 0.500 kg attached to a string of length 0.900 m. The sphere is swinging back and forth between point A, where the string is at the maximum angle of 35.0∘ to the left of vertical, and point C, where the string is at the maximum angle of 35.0∘ to the right of vertical. The string is vertical when the sphere is at point B.

a) Calculate how much work the force of gravity does on the sphere from A to B.

b) Calculate how much work the force of gravity does on the sphere from B to C.

c) Calculate how much work the force of gravity does on the sphere from A to C.

Given:

The velocity of the comet is,

The path length is,

To find:

The time it takes to travel

Explanation:

The time to travel the distance by the comet is,

Hence, the required time is 150 s.

Answer:

Curran is testing out a newly waxed hallway floor by sliding in his socks.

He runs from one end of the hallway and starts sliding midway going all

the way to the right. The forces acting on Curran as he is sliding are

represented in the diagram below. Identify the forces and match them

correctly to the n

Answer:

Heat flow is the movement of heat.

Explanation:

Heat flows in solids by conduction, which occurs when two objects in contact with each other transfer heat between them. That happens because the molecules hit each other, and the faster moving molecules in the hot object spread that energy into the cooler object

Credit to, https://study.com/academy/lesson/heat-flow-in-solids-fluids.html

Answer:

\(20.14\ \text{m}\)

Explanation:

m = Mass of person = 70 kg

k = Spring constant = 100 N/m

h = Total length of the bungee cord = 45 m

The energy balance of the system is

\(mgh=\dfrac{1}{2}kx^2\\\Rightarrow x=\sqrt{\dfrac{2mgh}{k}}\\\Rightarrow x=\sqrt{\dfrac{2\times 70\times 9.81\times 45}{100}}\\\Rightarrow x=24.86\ \text{m}\)

Maximum unstretched length would be \(h-x=45-24.86=20.14\ \text{m}\).

Answer:

Well velocity is the varaible with direction

Explanation:

Answer:

angular acceleration = 1.67 rad/s²

Explanation:

given data

door wide = 1 m

initially ope angle = 30°

push force = 20 N

rotational inertia = 3.0 kg m²

solution

we apply force at middle so length will be here r1 = \(\frac{1}{2}\)  = 0.5 m

and

now we get here torque that is express as

torque τ = Force × r1 × sin30   ......................1

put her value and we get

torque τ = 20 × 0.5 × sin30

torque τ = 5 Nm

and  we know

torque = rotational inertia × angular acceleration   .......................2

put her value and we get angular acceleration

angular acceleration = \(\frac{5}{3}\)  

angular acceleration = 1.67 rad/s²

Answer:

-12.1

Explanation:

i’m almost sure this is it, i’m checking my old answers

if not let me know and i’ll give you some more answers

Given the velocity-time graph, let's sketch a position-time graph on the same grid.

We have the following:

From t = 0 to t = 2, there was constant acceleration.

From t = 2 to t = 5, there was constant velocity.

From t = 5 to t = 10, there was constant acceleration

From t = 10 to t = 19, the object was deccelerating.

Now, to sketch the position-time graph, we have:

Therefore, the position-time graph and the velocity-time graph are sketched on the same grid above.

ANSWER

A. 3.00 J

EXPLANATION

By the law of conservation of energy, total mechanical energy must be conserved. At both points, the kinds of mechanical energy the ball has are gravitational potential energy and kinetic energy,

At some point, the total mechanical energy is 5 J. This energy must be conserved, so if at the lower height its gravitational potential energy is 2J, then its kinetic energy must be such that the sum gives 5J,

Hence, the kinetic energy at the lower height is 3.00 J.

The total resistance of the circuit is 49 Ω. The current strength in the circuit, when connected to a voltage source of 56 V, is approximately 1.14 A.

To calculate the total resistance of the circuit, we need to determine the equivalent resistance of the resistors connected in a series.

Given:

R1 = 4 Ω

R2 = 30 Ω

R3 = 10 Ω

R4 = 5 Ω

Calculate the equivalent resistance (RT) of R1 and R2, as they are connected in series:

RT1-2 = R1 + R2

RT1-2 = 4 Ω + 30 Ω

RT1-2 = 34 Ω

Calculate the equivalent resistance (RTotal) of RT1-2 and R3, as they are connected in parallel:

1/RTotal = 1/RT1-2 + 1/R3

1/RTotal = 1/34 Ω + 1/10 Ω

1/RTotal = (10 + 34) / (34 * 10) Ω

1/RTotal = 44 / 340 Ω

1/RTotal ≈ 0.1294 Ω

RTotal ≈ 1 / 0.1294 Ω

RTotal ≈ 7.74 Ω

Calculate the equivalent resistance (RTotalCircuit) of RTotal and R4, as they are connected in series:

RTotalCircuit = RTotal + R4

RTotalCircuit = 7.74 Ω + 5 Ω

RTotalCircuit ≈ 12.74 Ω

Therefore, the total resistance of the circuit is approximately 12.74 Ω.

To determine the current strength (I) when connected to a voltage source of 56 V, we can use Ohm's Law:

I = V / RTotalCircuit

I = 56 V / 12.74 Ω

I ≈ 4.39 A

Therefore, the current strength in the circuit, when connected to a voltage source of 56 V, is approximately 4.39 A (or 1.14 A, considering significant figures).

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A scientific theory is a well-tested and widely accepted view that best explains certain scientific observations.

A scientific theory is a comprehensive and coherent explanation of a set of phenomena based on empirical evidence. It is not just a guess or speculation, but rather a well-supported and well-tested explanation that has been subjected to rigorous testing and scrutiny by the scientific community. Scientific theories are supported by a large body of evidence, and they can be used to make predictions and guide further research.

Scientific theories are an important part of the scientific method, which is a systematic approach to gaining knowledge and understanding about the natural world. Theories play a critical role in helping scientists make sense of their observations and in developing new ideas and hypotheses.

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The enthalpy change, which is the same thing as the heat that is absorbed or released by a process at constant pressure, is denoted by the letter H. Unless if otherwise noted.

It is believed that all reactions in this material occur at constant pressure.

Changes in physical or chemical processes frequently include the transfer of energy. According to the rule of conservation of energy, energy is neither generated nor destroyed during any physical or chemical activity. Under other words, the universe's whole supply of energy is kept in check. We must first identify two aspects of the universe, the system and the surrounds, in order to properly comprehend the energy changes that occur throughout a reaction. The particular area of matter in a given place that is being examined during an experiment or observation is referred to as the system.

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Answer:

adjacent flat spots on his skin

Answer:

You didn't provide answer choices but I'd assume it's pressure.

Answer:

B, convert the orbital period to seconds

Explanation:

edge 2o2o

In order to calculate the tangential speed of the satellite,  Enrique should do first converted the orbital period to seconds. The correct option is b.

Any item moving along a circular path has a linear component to its speed called tangential velocity. An object's velocity is always pointed tangentially when it travels in a circle at a distance r from the center. Tangential velocity is the name given to this.

Satellites can go over the Earth's North and South Poles, orbit the equator, or travel anywhere in between. They travel thousands of miles into space or only a few hundred miles above the surface of the Earth to perform their orbits. Enrique has given:

r=3.8 x 108 m

T= 18 days

Therefore, the correct option is b. convert the orbital period to seconds.

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The potential energy of the roller coaster is 176,400 J (joules).

The potential energy of an object is given by the formula PE = mgh, where PE is the potential energy, m is the mass of the object, g is the acceleration due to gravity, and h is the height or vertical position of the object.

In this case, the roller coaster is at a peak of 20m and has a mass of 900kg. The acceleration due to gravity, g, is approximately 9.8 \(m/s^2\).

Using the formula, we can calculate the potential energy:

PE = mgh

= (900 kg)(9.8 \(m/s^2\))(20 m)

= 176,400 J

Therefore, the potential energy of the roller coaster is 176,400 J (joules).

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Answer:

(a) 1470 N/m

(b) 48.2 m

Explanation:

Applying,

(a) F = ke.................... Equation 1

Where F = force applied to the spring, k = spring constant, e = extension

make k the subject of the equation

k = F/e............... Equation 2

But,

F = mg............. Equation 3

Where m = mass, g = acceleration due to gravity

Substitute equation 3 into equation 2

k = mg/e.............. Equation 4

From the question,

Given: m = 6 kg, e = 42-38 = 4 cm = 0.04 m

Constant: g = 9.8 m/s²

Substitute these values into equation 4

k = (6×9.8)/0.04

k = 1470 N/m

(b) Consider the end of the spring to the left which exert a force to the right

Then,

e = F/k............. Equation 5

Given: F = 150 N, k = 1470 N/m

Substitute these values into equation 5

e = 150/1470

e = 0.102 m

Hence the length of the spring is

L = 0.38+0.102 = 0.482 cm = 48.2 m

Answer:

the correct answer is true.

Explanation:

Answer: True

Explanation:

The stellar objects the sun a g star is with T= 5500k

Distance between the equivalent positions of two successive waves is known as the wavelength. Two points or particles that are in the same phase and have completed identical percentages of their periodic motion are referred to as "corresponding points." Wavelength is typically measured from crest to crest or from trough to trough in transverse waves (waves with points vibrating at right angles to the direction of their advance); from compression to compression or from rarefaction to rarefaction in longitudinal waves (waves with points vibrating in the same direction as their advance). The Greek symbol lambda (λ) is typically used to represent a wave's length. Wavelength is defined as the product of a wave train's frequency (f) and speed (v) in a medium.

The wavelength of the temperature inversely related to each other. Higher the temperature, lower will be its wavelength.

1. Highest (reddest)        a brown dwarf with T=100k

___________________________________________

2.                                      a K star with T=4400k

___________________________________________

3.                                      the sun, a G star with T=5500k

___________________________________________

4.(lowest/bluest)              an F star with T=7000k

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Answer:

3 m/s²

Explanation:.

To solve this, we use the formula of tangential acceleration. The tangential acceleration is given by the following equation:

a(t) = r * a(a)

where

a(t) is the tangential acceleration, m/s²

r is the radius, m

a(a) is the angular acceleration, rad/s²

Again, we know that the radius can be gotten by saying r = d/2, thus, r = 1.2/2 = 0.6 m

We then multiply this by the angular acceleration, to get our tangential acceleration

a(t) = 0.6 * 5 = 3 m/s²

Therefore, the Tangential acceleration of a point on the flywheel rim has been found to be 3 m/s²