which type of spectrum contains dark bands that represent wavelengths intercepted by a material between a radiation source and the earth?

Answer:

a.  653.79 kgm²/s b. 440 Nm

Explanation:

a. The initial angular momentum

The initial angular momentum L of the boy and merry-go-round is

L = Iω where I = moment of inertia of merry-go-round + moment of inertia of Lindsey about merry-go-round and ω = initial angular velocity = 3.45 rad/s

moment of inertia of merry-go-round I₁ = 1/2MR² where M = mass of merry-go-round = 78 kg and R = radius of merry-go-round = 2.20 m

I₁ = 1/2MR² = 1/2 × 78 kg ×(2.20 m)² = 188.76 kgm²

moment of inertia of Lindsey about merry-go-round I₂ = mh² where m = mass of boy = 33.0 kg and h = distance of Lindsey from center of merry-go-round = 0.150 m

I₂ = mh² = 33.0 kg × (0.150 m)² = 0.743 kgm²

I = I₁ + I₂ = 188.76 kgm² + 0.743 kgm² = 189.503 kgm²

So, L = Iω = 189.503 kgm² × 3.45 rad/s = 653.79 kgm²/s

b. How much torque does Mike apply?

Since torque τ = FRsinθ where F = force = 200 N, R = radius of merry-go-round = 2.20 m and θ = 90° (since the force is applied tangentially to the merry-go-round)

τ = FRcosθ

= 200 N × 2.20 m × sin90°

= 440 Nm

Answer:

1). Average speed = 1.5 m per second

2). Average velocity = 1.5 m per second

Explanation:

1). Since, speed is a scalar quantity

   Therefore, average speed of the trip = \(\frac{\text{Total distance covered}}{\text{Total time taken}}\)

    From the graph attached,

   Total distance covered = 10 + 10 + 20 + 0 + 20 + 30

                                           = 90 meters

   Total time taken = 60 seconds

    Average speed = \(\frac{90}{60}\)

                               = 1.5 meter per second

2). Velocity is a vector quantity.

    Therefore, average velocity = \(\frac{\triangle d}{\triangle t}\)

                                                   = \(\frac{d_{60}-d_0}{60-0}\)

                                                   = \(\frac{90-0}{60-0}\)

                                                   = 1.5 meter per second                        

Answer:

Mined materials are needed to construct roads and hospitals, to build automobiles and houses, to make computers and satellites, to generate electricity, and to provide the many other goods and services that consumers enjoy.

Explanation:

The types of baryonic matter are most abundant in the universe are hydrogen and helium

Baryonic matter is the kind of matter that constitutes an ordinary matter, which is everything around us, these are the building blocks that form atoms. Some of the types of baryonic matter that are most abundant in the universe are hydrogen and helium. Hydrogenhis is the most abundant element in the universe, it makes up about 74% of the elemental mass, with most of the rest being helium. Hydrogen gas can be found in most galaxies, usually in the form of molecular hydrogen gas or in atomic form.

Helium is the second most abundant element in the universe, it is formed through nuclear fusion in the hearts of stars and also in supernova explosions, the vast majority of helium is in stars rather than in the interstellar medium. Carbon is the fourth most abundant element in the universe, after hydrogen, helium, and oxygen. Carbon atoms are produced inside stars through fusion of helium and other elements, they are also found in molecules in the form of carbon monoxide (CO) and carbon dioxide (CO2). So therefore the most abundant types of baryonic matter in the universe are Hydrogen and Helium.

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Two vectors vector a and vector b, each located in a different position in the plane, have equal magnitude and the same direction, both vectors are considered to be parallel to each other.

Two vectors are said to be parallel if and as it were in case the angle between them is degrees. Parallel vectors are too known as collinear vectors, that is two parallel vectors will be continuously parallel to the same line but they can be either within the same direction or within the exact inverse direction. The cross product of any two parallel vectors could be a zero vector. For any two parallel vectors a and b, their dot product is equal to the product of their magnitudes.

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Answer:

Explanation:

When two magnets are brought together, the opposite poles will attract one another, but the like poles will repel one another. This is similar to electric charges. Like charges repel, and unlike charges attract. Since a free hanging magnet will always face north, magnets have long been used for finding direction.

The nuclear particle carrying a charge of 1e is a proton. The proton is positively charged and is located in the nucleus of an atom.

Electrons, which have a charge of -1e, orbit the nucleus and balance out the positive charge of the protons to keep the atom neutral.In a chemical reaction, the number of protons does not change.

This means that each element has a unique number of protons, which is known as the atomic number. For example, carbon has an atomic number of 6, which means that it has 6 protons in its nucleus.

In conclusion, the nuclear particle carrying a charge of 1e is the proton. The proton is a positively charged particle located in the nucleus of an atom. It has an atomic number that is unique to each element and determines its chemical properties.

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The magnitude of the centripetal acceleration of the car as it goes round the curve is 4.8 m/s²

From the question, we are to determine the magnitude of the centripetal acceleration.

Centripetal acceleration can be calculated by using the formula

\(a_{c} =\frac{v^{2} }{r} \)

Where \(a_{c} \) is the centripetal acceleration

\(v\) is the velocity

and \(r\) is the radius

From the given information

\(v = 12 \ m/s\)

and \(r = 30 \ m\)

Therefore,

\(a_{c} =\frac{12^{2} }{30} \)

\(a_{c} =\frac{144 }{30} \)

\(a_{c} = 4.8\ m/s^{2} \)

Hence, the magnitude of the centripetal acceleration of the car as it goes round the curve is 4.8 m/s²

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This is one of the example of Newton's third law of motion. The first two options are the right answers

Momentum is the product of mass and velocity. According to conservation of linear momentum, the sum of momentum before collision is equal to the sum of momentum after collision.

What happens when a boater pushes against the water with an oar?

The water pushes back because according to Newton's third law, in any action, there must be equal and opposite reaction. Also, the boat will move in the opposite direction.

The water will not have more force than the oar neither will the oar has more force than the water because in any action.

Therefore, when a boater pushes against the water with an oar, the water pushes backward and the boat moves in the opposite direction.

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Answer:

mechanic and potential?

Explanation:

The electric charge on the rod is no longer separated.

If the magnetic field is parallel to the position of the exposed surface the magnetic flux produced will be zero if the magnetic field is non-zero. If a charged particle moving parallel to the magnetic field has a velocity parallel to the magnetic field, then the force is zero In the above case the velocity is parallel to the magnetic field lines, so the magnetic force is zero.

Induced currents can be created by changing the strength of the magnetic field changing the size of the wire loop, or changing the direction of the wire loop. The main difference between magnetic flux and flux density is that magnetic flux is a scalar quantity whereas flux density is a vector quantity. Flux is the scalar product of flux density and area vector.

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Answer:

In antiquity, systems of measurement were defined locally: the different units might be defined independently according to the length of a king's thumb or the size of his foot, the length of stride, the length of arm, or maybe the weight of water in a keg of specific size, perhaps itself defined in hands and knuckles.

Systems of Measurement: there are two main systems of measurement in the world: the Metric (or decimal) system and the US standard system. ... The US Standard system uses units that have no predictable relationship to each other. For example, there are 2 cups in a pint, but 4 quarts in a gallon.

We want to compare the gravitational acceleration of different planets by using the given table. The correct option is the last one, so we have:

Planet Y, planet W, planet Z, planet X.

First, we know that the velocity equation is written as:

V(t) = a*t + v₀

Where a is the acceleration and v₀ is the initial velocity.

With this equation, we can find the acceleration in each planet.

Planet W

The initial velocity is v₀ = -3m/s

V(t) = a*t - 3m/s

And we know that at t = 2s, the velocity is -22m/s.

v(2s) = -22m/s = a*2s - 3m/s

           -22m/s + 3m/s = a*2s

           -19 m/s = a*2s

           (-19 m/s)/2s = a = -9.5m/s^2

Now we just do the same thing for each planet.

Planet X:

v₀ = -0.5 m/s

v(1s) = -4.2 m/s = a*1s - 0.5 m/s

          -4.2 m/s + 0.5 m/s = a*1s

          -3.8 m/s^2 = a

Planet Y:

v₀ = 0 m/s

v(2s) = -21 m/s = a*2s

           (-21 m/s)/2s = a = -10.5 m/s^2

Planet Z:

v₀ = 0 m/s

v(1s) = -8 m/s = a*1s

          (-8 m/s)/1s = a = -8m/s^2

Then the order from greatest to least is:

Y, W, Z, X

So the correct option is the last one.

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Answer:

0

Explanation:

The bicyclist is not speeding up or slowing down so there is no acceleration.

Answer:

Vector Quantity

Explanation:

i dont know how to explain it my g

a) To find the velocity at a time t, we need to integrate the acceleration function with respect to time. Using the given acceleration function a(t) = 2t + 3, we integrate it to obtain the velocity function v(t):

v(t) = ∫(2t + 3) dt

v(t) = t^2 + 3t + C

To find the constant of integration (C), we use the initial velocity v(0) = -4:

-4 = (0)^2 + 3(0) + C

C = -4

Therefore, the velocity at time t is given by:

v(t) = t^2 + 3t - 4

b) To find the distance traveled over the time interval 0 ≤ t ≤ 3, we need to integrate the velocity function v(t) with respect to time and evaluate it within the given time interval. The distance traveled (d) is given by:

d = ∫[0,3] (t^2 + 3t - 4) dt

Evaluating the integral within the limits:

d = [(1/3)t^3 + (3/2)t^2 - 4t] [0,3]

d = [(1/3)(3)^3 + (3/2)(3)^2 - 4(3)] - [(1/3)(0)^3 + (3/2)(0)^2 - 4(0)]

d = 9 + 13.5 - 12 - 0

d = 10.5

Therefore, the particle traveled a distance of 10.5 units over the time interval 0 ≤ t ≤ 3.

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From a Martian point of view, the most notable difference between observing the solar system in a geocentric model versus a heliocentric model would be the relative positions of the planets in the sky. In a geocentric model, the Earth is at the center of the solar system and all the other planets orbit around it. In contrast, in a heliocentric model, the sun is at the center of the solar system and all the planets, including Earth, orbit around it.

If we were observing the solar system from the surface of Mars, we would see the planets from Mars' point of view. In this scenario, the planets would appear to move in the sky in ways that are different from what we observe from Earth. For example, Mars and Earth would appear to be orbiting around the sun at different rates, and thus their relative positions to each other would change over time, but the relative positions of the other planets to the Earth would not change as much as in our heliocentric model.

Additionally, the apparent size and brightness of the planets would also appear different from Mars than they do from Earth. This is due to the fact that the distance between Mars and the other planets is not the same as the distance between Earth and the other planets.

In summary, from a Martian point of view, the relative positions of the planets in the solar system would appear different than what we observe from Earth due to the geocentric model of the solar system and the difference in the distance between Mars and the other planets.

The angular acceleration of the frictionless pulley that has a rope going over it the tension in the rope is 10 n on one side and 12 n on the other side is 16.06 rad/s²

The mass of the solid cylinder, m = 0.83kg and radius, r = 0.30 m

The moment of inertia = 1/2 mr²

I = 1/2 (0.83) (0.30)²

I = 0.03735 kg m²

The net torque = F₁r - F₂r = 12(0.3) - 10(0.3) = 0.6 Nm

Torque = moment of inertia (I) × angular acceleration (α)

Substituting the values,

α = 16.06 rad/s²

Therefore, the angular acceleration of the pulley is  16.06 rad/s².

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(complete question)

A frictionless pulley which can be modeled as a 0.83kg solid cylinder with a 0.30 m radius, has a rope going over it the tension in the rope is 10 n on one side and 12 n on the other side what is the angular acceleration of the pulley?

Answer:

im just 15 yearsold hehhez i dont know that either

Answer:

i. Cyclist A travelled 15 km 1 h cyclist A had started his journey from point X

  Cyclist B travelled 18 km 1 h cyclist A had started his journey from point X

ii. cyclist B overtake cyclist A 6 km from the same starting point X.

Explanation:

From the question,

- Cyclist A and B cycled at an average speed of 15 km/h and 20 km/h respectively.

- Cyclist B started his journey 6 mins after cyclist A had started.

Let the cyclist A time be t.

Then, we can write that

For Cyclist A

Speed = 15 km/h

Time = t mins

For Cyclist B

Speed = 20 km/h

Time = (t - 6) mins

i) To determine the distances travelled by cyclist A and B 1h cyclist A had started his journey,

For Cyclist A

Speed = 15km/h

Time = 1h = 60 mins

From the formula

Speed = Distance / Time

Then,

Distance = Speed × Time

Putting the values into the equation,

Distance = 15km/h × 1h

Distance = 15 km

∴ Cyclist A travelled 15 km 1 h cyclist A had started his journey from point X

For cyclist B

Speed = 20km/h

Time = 1h - 6mins = 60mins - 6mins = 54mins = 54/60 hour = 0.9 h

Also, from

Distance = Speed × Time

Putting the values into the equation

Distance = 20km/h × 0.9h

Distance = 18 km

∴ Cyclist B travelled 18 km 1 h cyclist A had started his journey from point X

ii) To determine the distance cyclist B overtake cyclist A, that is, when the distance covered by cyclist A equals that covered by cyclist B.

First, we will determine the time at which the distances covered by both cyclists were equal.

From

For Cyclist A

Speed = 15 km/h

Time = t hour  

Distance = Speed × Time

Distance = 15t km

For Cyclist B

Speed = 20 km/h

Time = (60t - 6) mins = (t - 0.1) hour

Distance = 20 × (t - 0.1) = (20t - 2) km

Equate the distances

15t = 20t - 2

15t - 20t = -2

-5t = -2

5t = 2

t = 2/5

t = 0.4 hour

Hence, cyclist B overtake cyclist A 0.4 hour after cyclist A had started.

For the distance cyclist B overtake cyclist A,

From

Distance = (20t - 2) km

Distance = (20×0.4 - 2) km

Distance = (8 - 2) km

Distance = 6 km

Hence, cyclist B overtake cyclist A 6km from the same starting point X.

Typically, resistors are denoted by symbols like R, RN, RF, and FS or by rectangular forms with two parallel lines on either side that are commonly oriented vertically.

The resistor, a component used in electrical circuits to restrict the flow of current, is represented by the symbol of the physical form of a resistor.

The two parallel lines stand in for the resistor's two terminals, which are the locations where it is linked to the circuit. Typically, a color code or a number value written on the resistor's body will show the value of the resistor.

From simple electronic toys to sophisticated computer systems, resistors are a common component of electronic devices and are crucial for controlling flow.

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The substance which has the highest specific heat is b. water

The quantity of heat energy needed to raise a substance's temperature by a certain amount is measured by its specific heat. The term specific heat capacity refers to total amount of heat energy needed to increase a substance's temperature by one degree Celsius per kilogram. In terms of joules per gramme per degree Celsius or calories per gramme per degree Celsius, it is measured.

Compared to many other substances, water has a high specific heat. Water has a specific heat of about 4.18 °C or 1 cal °C). This means that to raise the temperature of one gram of water by one degree Celsius, 4.18 joules or which can be one calorie of energy are required.

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Answer:

4

Explanation:

cause two and two have 4 elements

Answer:

-7m/s

Explanation:

90-35=55

-8.5sin(55)

=-6.962

=-7 0m/s

The net electric force on charge +q is along direction C.

option C.

The electric force between two charges is determined applying Coulomb's law of electrostatic force.

Mathematically, the formula for this law is given as;

F = kq₁q₂/r²

where;

The strength of the electric force increases with decrease in the distance between the two charged particles.

The distance between the charge at the center and

The electric force is strongest towards point C, so the direction of the force will be towards point C.

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The coefficient of static friction between the crate and the floor is calculated to be 0.275.

The frictional force when an object moves on the horizontal surface is given as,

Ff = μ N

where, N is the normal force

μ is the coefficient of static or kinematic friction

If no forces other then the weight and the normal are acting upon the y-direction, then the weight and the normal force are equal in magnitude.

N = W = m g

Given that,

Mass of the crate = 26 kg

Frictional force Ff = 70 N

Weight of the crate = 26 × 9.8 = 254.8 N

The normal force is 254.8 N.

The coefficient of static friction μ = Ff /N = 70/254.8 = 0.275

Thus, the coefficient of static friction between the crate and the floor is 0.275.

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Well to be honest i probably could answer this if I had the thing to look at to solve it but if not i saw try lucky C. although that doesn't seem like the answer to be honest, either A. or B. seem like reasonable answers to Since D. Does not make sense for this specific question stated, inches for Celsius? Seems a bit off. I say maybe 1. or b. But if your daring choose D. It is really up to you to decide, After all I really do not have anything to base this off of.