HELP!!!!
My Science teacher does not know how to do this!!!
1. A car is driving around a curve at a constant speed of 30 mph. The car has a mass of 2000 kg and a radius of 0.5 m. Calculate the angular momentum of the car.

The best material for achieving thermal equilibrium can be determined by analyzing the data table. The time taken for each object to reach thermal equilibrium is dependent on the material used to divide them.

Material C appears to be the best as it takes the least amount of time for the objects to reach thermal equilibrium.  

Based on the given information, the material that results in the shortest time to reach thermal equilibrium would be considered the best thermal conductor. To determine this, compare the times in the data table for materials A, B, and C. The material with the shortest time to reach thermal equilibrium is the best thermal conductor and, therefore, the best material for this experiment.

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The converse of the statement "No pilots are mechanics" is No mechanics are pilots.

Hence, the correct option is A.

The converse of a statement switches the subject and the predicate and negates both. In the original statement, the subject is "pilots" and the predicate is "mechanics."

The original statement states that there is no overlap between pilots and mechanics. In the converse statement, the subject becomes "mechanics" and the predicate becomes "pilots," and it still states that there is no overlap between the two groups.

Therefore, The converse of the statement "No pilots are mechanics" is No mechanics are pilots.

Hence, the correct option is A.

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Answer:

non-luminous

Explanation:

Moon doesn't give off light of its own, that's why the moon is considered a non-luminous body

Answer:

Acceleration = 5.77 m/s²

Distance cover in 13 seconds = 487.56 meter

Explanation:

Given:

Final velocity of mobile device = 75 m/s

initial velocity of mobile device = 0 m/s

Time taken = 13 seconds

Find:

Acceleration

Distance cover in 13 seconds

Computation:

v = u + at

75 = 0 + (a)(13)

13a = 75

a = 5.77

Acceleration = 5.77 m/s²

s = ut + (1/2)(a)(t²)

s = (0)(t) + (1/2)(5.77)(13²)

Distance cover in 13 seconds = 487.56 meter

Answer:

1.33mph

Explanation:

The mass density of a cube of a certain metal with 0.040 m sides and a mass of 0.48 kg is calculated by dividing the mass of the cube by the volume of the cube. The mass density is (e) 7500 kg/m³.

To find the mass density of the cube, we can use the formula:

mass density = mass / volume

Since the cube has equal sides of 0.040 m, its volume is given by:

volume = length × width × height = 0.040 m × 0.040 m × 0.040 m = 0.000064 m³

We know the mass of the cube is 0.48 kg, so we can now calculate the mass density:

mass density = 0.48 kg / 0.000064 m³ = 7500 kg/m³

Therefore, the mass density of the cube is 7500 kg/m³, and the correct answer is (e).

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It would take 0.717 seconds to reach the ground if it is thrown straight down with the same speed.

What is speed?

Speed is the rate of motion or movement of an object. It is calculated by dividing the distance the object travels by the time it takes to travel that distance. It can be calculated in different ways, such as miles per hour, kilometers per hour, meters per second, and feet per second. Speed is essential for activities such as driving, running, and biking. Speed can also be used to measure the velocity of an object in a given direction. It is an important concept in physics, with speed being a vector quantity that is the magnitude of a velocity.

\($$The known values are: $t=2.35 \mathrm{~s} ; y=0 \mathrm{~m} ; v_0=+8.00 \mathrm{~m} / \mathrm{s} ;$ and $a=-9.8 \mathrm{~m} / \mathrm{s}^2$Based on the given values, the formula that we shall use is$$y=y_0+v_0 t+\frac{1}{2} a t^2$$Substituting the values, we have$$\)

\($$\begin{aligned}y & =y_0+v_0 t+\frac{1}{2} a t^2 \\0 & =y_0+(8.00 \mathrm{~m} / \mathrm{s})(2.35 \mathrm{~s})+\frac{1}{2}\left(-9.80 \mathrm{~m} / \mathrm{s}^2\right)(2.35 \mathrm{~s})^2 \\y_0 & =8.26 \mathrm{~m} \quad \text { }\end{aligned}$$\)

Therefore, the cliff is 8.26 meters high.

\($\begin{aligned}y & =y_0+v_0 t+\frac{1}{2} a t^2 \\0 \mathrm{~m} & =8.26 \mathrm{~m}+(-8.00 \mathrm{~m} / \mathrm{s}) t+\frac{1}{2}\left(-9.80 \mathrm{~m} / \mathrm{s}^2\right) t^2 \\4.9 t^2+8 t-8.26 & =0\end{aligned}$$ \text {Using the quadratic formula to solve for the value of t we have}$$\begin{aligned}& t=\frac{-8 \pm \sqrt{(8)^2-4(4.9)(-8.26)}}{2(4.9)} \\& t=0.717 \mathrm{~s} \quad \text { }\end{aligned}$$\)

Thus, It would take 0.717 seconds to reach the ground if it is thrown straight down with the same speed.

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Complete question:

(a) Calculate the height of a cliff if it takes 2.35 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.00 m/s.

(b) How long would it take to reach the ground if it is thrown straight down with the same speed?

Answer:

I am thinking D. correct me if I am wrong

A projectile is launched at an angle of 33⁰ above the horizontal, then the projectile launched at an angle of 90 - 33 = 57⁰ will have the same range as the projectile launched at 33⁰. The correct option is (B) 57⁰.

In the absence of air resistance, a projectile launched at an angle of 33 above the horizontal will have the same range as a projectile launched at an angle of 57⁰.

The range of a projectile can be determined by using the range formula.

R = ((v^2 * sin(2θ))/g) Where

R is the range of the projectile,

v is the velocity of the projectile,

θ is the angle at which the projectile is launched, and

g is the acceleration due to gravity.

In the absence of air resistance,

the horizontal component of velocity of a projectile remains constant throughout the flight.

So, the range of a projectile depends only on its initial velocity and the angle at which it is launched.

If a projectile is launched at an angle θ,

the time of flight of the projectile can be calculated by using the following formula:

T = (2v * sin(θ))/g

The maximum height reached by the projectile is given by the formula:

H = (v^2 * sin^2(θ))/2gIf a projectile is launched at an angle θ, then the range of the projectile will be the same as the range of the projectile launched at an angle of (90 - θ).

So, if a projectile is launched at an angle of 33⁰ above the horizontal, then the projectile launched at an angle of 90 - 33 = 57⁰ will have the same range as the projectile launched at 33⁰.

Therefore, the correct option is (B) 57⁰.

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Inertia has an impact on both moving and stationary objects, according to Newton's first law of motion. Unless an unbalanced force is acting on an object, Newton's first law states that it will stay at rest or move in a straight line at a constant speed.

What is inertia?

Iners, which means idle or slow in Latin, is where the word inertia originates. Any physical object's resistance to a change in velocity can also be referred to as having inertia. Changes in the object's motion's speed or direction fall under this category. This trait includes the propensity for objects to continue going straight ahead at a constant pace in the absence of external pressures. Mass, a quantitative characteristic of physical systems, manifests itself primarily in inertia. One of the pillars of traditional physics is the concept of inertia.

It is still utilized today to describe how objects move and are impacted by external forces.

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1.54 hours of time were spent on the trip.

Average speed can be defined as the total distance travelled per total time taken.

Given that a person takes a trip, driving with a constant speed of 97.5 km/h, except for a 28.0-min rest stop. the person's average speed is 68.0 km/h.

With a constant speed, 97.5 = distance / ( t - 28/60 )

distance = 97.5 ( t - 0.467 )

distance = 97.5t - 45.5

With an average speed, 68 = distance / t

distance = 68t

Since the distance is the same, equate the two equation

68t = 97.5t - 45.5

68t - 97.5t = -45.5

-29.5t = -45.5

Make t the subject of formula

t = 45.5 / 29.5

t = 1.54 h

Therefore, 1.54 hours of time were spent on the trip.

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Answer:

Landform A.

Explanation:

Coastlines are created by wind and water erosion. The coast, also known as the coastline or seashore, is defined as the area where land meets the sea or ocean, or as a line that forms the boundary between the land and the ocean or a lake.  The picture/graph associated with this question is attached.

Answer:

Landform A.

Explanation:

The distance above the ground the rock  should be dropped such that it hits the ground at 2t after it is released from rest is 4h.

The height of fall of the rock is calculated by applying the following kinematic equation as shown below.

h = vt + ¹/₂gt²

where;

h = 0 + ¹/₂gt²

h = ¹/₂gt²

2h = gt²

g = 2h / t²

h₁ / t₁² = h₂ / t₂²

The distance above the ground the rock  should be dropped such that it hits the ground at 2t after it is released from rest is calculated as;

h₂ = ( h₁ / t₁² )(t₂²)

h₂ = ( h/t²)(2t)²

h₂ = ( h/t²)(4t²)

h₂ = 4h

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Answer:

When you push your palms together and rub them back and forth, you are demonstrating one way of converting Kinetic energy into thermal energy.

Answer:

20.96 m/s

Explanation:

Apply the kinematic equation:

Vf=Vi+at

Vi=8m/s

a=1.8m/s^2

t=7.2s

Putting this all in should give you your answer of 12.96m/s

No, the sun cannot explain global warming. Global warming is a phenomenon in which the temperature of the Earth's surface and atmosphere is rising continuously due to human activities such as deforestation, burning of fossil fuels, and industrialization.

This increase in temperature cannot be explained only by an increase in solar radiation.There are several factors which contribute to global warming, including greenhouse gases such as carbon dioxide, methane, and water vapor. These gases trap heat in the Earth's atmosphere, which causes the planet's temperature to rise. The sun's radiation does contribute to global warming, but it is not the main cause.

i) To calculate the increase in solar radiation that would cause the Earth to warm up by 1 K, we can use the following formula:ΔS = ΔT / αWhere ΔS is the increase in solar constant, ΔT is the increase in temperature, and α is the Earth's albedo (reflectivity).α = 0.30 is the standard value used for the Earth's albedo.ΔS = ΔT / αΔS = 1 K / 0.30ΔS = 3.33 W/m2So, to explain the increase in temperature of 1 K over the last hundred years, the solar constant would need to increase by 3.33 W/m2.

ii) The observed fluctuation of the solar constant over the past 400 years has been around 0.1% to 0.2%. This is much smaller than the 3.33 W/m2 required to explain the increase in temperature of 1 K over the last hundred years. Therefore, it is unlikely that the sun is the main cause of global warming.

The sun cannot explain global warming. While the sun's radiation does contribute to global warming, it is not the main cause. The main cause of global warming is human activities, particularly the burning of fossil fuels, which release large amounts of greenhouse gases into the atmosphere.

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Yes, the weight of the suspension clamps is omitted from the calculation as long as each side of the support is the same.

Suspension clamps are mainly used for overhead power lines or substations. It can hang wire, lightning protection wire on insulator string, or lightning protection cable on the tower by connecting fittings. Suspension clamps are mainly made of malleable iron and aluminum alloy.

Given the same number of clamps on both sides of the support, when we calculate the torque, the weight of the clamps will disappear from each side.

Like there are 2 clamps on each side so the torque due to the clamps are going to be

                  τ = r x F = 2 * W * d - 2 * W * d          

So that the weight of the clamps can be omitted as in the final calculation of the torque as each clamp will cancel out. Provided that the position of the clamps on both sides of the support is the same (i.e., distance d from the support)

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The acceleration of an object is directly related to the net force exerted upon it and inversely related to the mass of the object.

answer : directly , inversely

Answer:

energy left over from the big bang

Explanation:

Answer:

i hope this helps you have a good day i hope you get an 100% on you quiz!

Explanation:

The atmosphere is a mixture of nitrogen (78%), oxygen (21%), and other gases (1%) that surrounds Earth. High above the planet, the atmosphere becomes thinner until it gradually reaches space. The atmosphere is an important part of what makes Earth livable.

In relation to line locators, conductive refers to a direct connection between the pipe and transmitter. Conductive locating involves connecting a transmitter to a metallic pipe or cable and then using a receiver to detect the signal transmitted through the pipe or cable.

The transmitter sends an electrical signal through the conductive material, which is then picked up by the receiver. This technique is particularly useful when locating pipes or cables that are buried underground or hidden behind walls. By using conductive locating, line locators can accurately determine the location, depth, and direction of the pipe or cable. In contrast, an indirect connection with radio waves, as in option B, is referred to as inductive locating, which involves detecting the electromagnetic field around the pipe or cable. While inductive locating can be useful in some situations, such as locating non-conductive pipes or cables, it is less accurate than conductive locating. Overall, conductive locating is a key technique used by line locators to accurately and efficiently locate buried or hidden pipes and cables.

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Explanation:

The question is not complete, here is the complete question

"Beatrice and the Elevator Beatrice, a middle school student, is visiting a very tall office building and notices that she feels heavier when the elevator car is traveling up and lighter when the elevator car is traveling down. After making these observations, Beatrice comes back to the building and stands on a bathroom scale that measures her weight as she travels up and down in the elevator.

1. . What question is Beatrice trying to answer?

2. What is one variable Beatrice could change in her investigation? What might she figure out if this

variable was changed"

1. Beatrice is trying to observe the influence of the elevator movement on her weight, Hence the question is "will the elevator  movement cause her weight to change"

therefore moving upward the reading on the scale will increase

Reading=mg+ma

downward

Reading will reduce

Reading=mg-ma

2. The independent variable is the acceleration due to gravity g=9.81m/s^2

while the dependent variables are

    i. The elevators acceleration

    ii. Beatrice's mass

When a wire is stretched to twice its initial length, its resistance increases by a factor of 4.

The resistance of a wire is directly proportional to its length, and inversely proportional to its cross-sectional area. When a wire is stretched to twice its initial length, its cross-sectional area is reduced to one-fourth of its original value. Therefore, the resistance of the wire increases by a factor of 4 (i.e., 2²). This can be seen from the equation R = (ρL)/A, where R is resistance, ρ is resistivity, L is length, and A is cross-sectional area. When the length of the wire is doubled, the resistance becomes twice its original value. However, the reduction in the cross-sectional area also contributes to an increase in resistance, making it four times the original value.

In conclusion, when a wire is stretched to twice its initial length, its resistance increases by a factor of 4 due to the reduction in its cross-sectional area.

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Answer: A

Explanation: STEP BY STEP

For a diode operating in the Zener region, the correct answer is d. I and IV.

1) Reverse voltage Vz is almost fixed at a value called "Zener Voltage": This statement is correct. In the Zener region, the reverse voltage across the diode remains nearly constant (Vz) regardless of changes in current.

II) Vp and I are both negative: This statement is not necessarily correct. In the Zener region, the voltage across the diode (Vp) can be positive or negative, depending on the polarity of the applied voltage. However, the current (I) is always in the reverse direction.

III) A large % change in Ip causes a very small % change in VD: This statement is not correct. In the Zener region, a change in the reverse current (Ip) can cause a significant change in the voltage across the diode (VD).

IV) Reverse current Iz is almost fixed: This statement is correct. In the Zener region, the reverse current (Iz) remains almost constant over a wide range of applied voltages (Vp).

Therefore, only statements I and IV are correct.

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The speed of the chair when it strikes the ground, after being dropped from its rest position, is approximately 9.9 m/s.

The potential energy of an object at a certain height can be converted into kinetic energy when it falls. In this case, the potential energy of the chair is given as 250 J. The potential energy can be equated to the kinetic energy of the chair just before it strikes the ground.

The kinetic energy of an object is given by the equation \(KE = (1/2)mv^2\), where m is the mass of the object and v is its velocity. In this scenario, the potential energy is converted entirely into kinetic energy. Thus, reaction Force we can write the equation as PE = KE.

Given that the mass of the chair is 20 kg and the potential energy is 250 J, we can solve for the velocity using the equation \(250 J = (1/2)(20 kg)(v^2)\). Rearranging the equation and solving for v, we find\(v^2 = (2 * 250 J) / 20\) kg, which simplifies to \(v^2 = 25 m^2/s^2\). Taking the square root of both sides, we get v = 5 m/s.

Therefore, the speed of the chair when it strikes the ground is approximately 5 m/s.

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