The roof on a shed is a square-based pyramid. if the base has a side length of 10 feet and the slant height of the roof is 9.4 feet, find the area of the roof.

Answer:

C

Explanation:

Waiting after pouring boiling water into a beaker before reading the thermometer ensures thermal equilibrium, allows for heat transfer and temperature uniformity within the water, accounts for temperature lag in the thermometer, and promotes safety by reducing the risk of burns

It is important to wait for a while after boiling water is poured in a beaker before reading the thermometer due to several reasons:

Thermal Equilibrium: When boiling water is poured into a beaker, the water is at its boiling point, which is typically 100 degrees Celsius at sea level. However, the beaker and the surrounding environment may be at a lower temperature. In order to obtain an accurate measurement of the water's temperature, it is necessary to wait for the water to reach thermal equilibrium with the surroundings. This ensures that the thermometer reading reflects the actual temperature of the water.

Heat Transfer: The process of transferring heat takes time. Even though the water is boiling, the temperature may not be evenly distributed throughout the liquid. The outer layers of the water may be closer to the boiling point, while the inner layers may be slightly cooler. Waiting allows for the heat to distribute more evenly, reducing temperature variations within the water and providing a more accurate measurement.

Temperature Lag: Thermometers, especially those made of glass, can have a temperature lag. This means that it takes some time for the thermometer to adjust to the temperature of the substance it is measuring. By waiting for a while, the thermometer can catch up to the actual temperature of the water, providing a more reliable reading.

Safety Precautions: Boiling water is at a high temperature and can cause burns or scalding. Waiting for a while before reading the thermometer allows the water to cool slightly, reducing the risk of accidental contact with hot water and minimizing the potential for injury.

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Answer:

Explanation:

B

Answer: B.It uses a renewable resources

Explanation:

Explanation:

the average velocity of the car is 15 m/s example I have this on a test

Answer:

c) Water molecules melt into gas molecules.

The chemical structure of water when it changes state - D. Nothing happens to the chemical structure.

Physical state of an object is the condition where substance have different energy content. For instance water is on heating it change into vapor or gaseous phase while cooling (decreasing heat content) causes water to become ice in solid phase. Therefore,

Thus, the change in physical state do not affect chemical properties, but affects the kinetics of the reactions.

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In Part A, the angular momentum of the system about the origin can be calculated using the formula:

L = r × p, where r is the position vector from the origin to the center of mass of the system, and p is the linear momentum of the system. In this case, since the system is rotating in the xy-plane about the origin, the angular momentum is in the +z direction. The position vector r is perpendicular to the plane of rotation and has a magnitude of ℓ/2. The linear momentum of each particle is mvi, where vi is the speed of the particle. Using this information, we can calculate the angular momentum of the system as: L = (ℓ/2) × (m1v1 - m2v2). Substituting the given values, we get: L = (1/2) × (4.00 kg × 6.40 m/s - 3.00 kg × 6.40 m/s) = 22.4 kg·m^2/s. In Part B, we need to find the new angular momentum of the system if each of the masses were instead a solid sphere 10.5 cm in diameter. In this case, we can assume that the spheres rotate about their own center of mass. The moment of inertia of each sphere can be calculated using the formula for the moment of inertia of a solid sphere: I = (2/5) × mr^2, where m is the mass of the sphere and r is the radius of the sphere. Substituting the given values, we get: I = (2/5) × (m/4π) × (10.5/200)^2, where m = 4.00 kg for one sphere and m = 3.00 kg for the other sphere. The total moment of inertia of the system can be found by adding the moments of inertia of the two spheres. We can then use the formula for the angular momentum of a rotating object: L = Iω, where ω is the angular velocity of the system. However, we do not have enough information to find the angular velocity ω. Therefore, we cannot find the new angular momentum of the system with the given information.

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The energy a 12V battery can deliver if it can move 3000°C of charge will be 36000 J and the energy that an identical battery (12V) can deliver while moving a charge of 40,000°C will be 480000 J

Charged material experiences a force when it is exposed to an electromagnetic field due to the physical characteristic of electric charge. You might have a positive or negative electric charge. Contrary charges attract one another while similar charges repel one another.

Given a 12V battery can deliver if it can move 3000 C of charge, and the energy that an identical battery (12V) can deliver while moving a charge of 40,000 C

We have to find total energy that this battery can deliver

Let,

q = 3000 C

V = 12 V

The total energy delivered by battery will be as follow:

U = qv

U = 3000 x 12

U = 36000 J

Similarly for another battery

q = 40000 C

V = 12 V

So total energy delivered will be

U = 40000 x 12

U = 480000 J

Hence the energy a 12V battery can deliver if it can move 3000°C of charge will be 36000 J and the energy that an identical battery (12V) can deliver while moving a charge of 40,000°C will be 480000 J

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The effective resistance of the two wires connected end to end is (3ρ * l) / (2a).

To find the effective resistance, we need to consider the total resistance of the two wires connected in series.

Let's denote the resistance of the first wire as R1, length as l, and area of cross-section as a. The resistance of the first wire can be calculated using the formula: R1 = (ρ * l) / a, where ρ is the resistivity of the wire material.

The resistance of the second wire, which has twice the area of the cross-section, can be denoted as R2. Since the length and material are the same, the resistance is inversely proportional to the area of the cross-section. Therefore, the resistance of the second wire can be expressed as R2 = (ρ * l) / (2a).

To find the effective resistance when these two wires are connected end to end, we need to add their resistances together:

Effective resistance = R1 + R2
                 = (ρ * l) / a + (ρ * l) / (2a)
                 = (2ρ * l + ρ * l) / (2a)
                 = (3ρ * l) / (2a)

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Answer:

I think the answer 1

Explanation:

im probably wrong too i dont know

When transferring a vacuum furnace chamber from atmospheric pressure to a supposedly "rough" vacuum, the roughing valve is utilized (typically in the range of 10 -2 to 10 -3 Torr).

This degree of vacuum is sometimes sufficient to carry out the targeted process. Another common name for vacuum is negative pressure (or soft vacuum). This happens when an application needs to keep track of both pressure increases and pressure drops in both directions above and below the atmosphere. The difference in pressure between the exhaust exit and input provides the basis for a vacuum.

We all know that water and air travel from high altitude to low altitude, and that a vacuum is produced by a difference in pressure between the two.

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Answer:

22

Explanation:

all the resistance numbers added together 2.0+6.0+10.0+4.0

resistance formula : v bettary = v1 + v2 + v3 ....

Answer: B

Explanation:

Answer:

9.81 m/s^2 downwards

Explanation:

At the top only weight acts on the ball. Therefore,

\(net \: force = ma \\ weight = ma \\ mg = ma \\ a = g \\ a = 9.81 {ms}^{ - 2} \)

Answer:

24

Explanation:

24.305 of atomic mass has 12 neutrons

Resistance(R) of a device is given by

Final answer is :- 2.67 ohm

Answer:

The answer is 0.33 H!

Explanation:

Answer:

12.5 grams

Explanation:

From the question,

E' = E/2⁽ⁿ/a⁾....................... Equation 1

Where E' = mass left, E = Original mass, n = time, a = half-life.

Given: E = 200 grams, n = 40 years, a = 10 years.

Substitute these values into equation 1

E' = 200/2⁽40/10⁾

E' = 200/2⁴

E' = 200/16

E' = 12.5 grams.

Hence 12.5 grams of the isotope will be left.

Answer:

Obviously, the 5lb ball when thrown will go farther . Newton second law of motion F = mass x acceleration .

So the more the mass , the more force will be used to throw the ball.

Explanation:

The force FB, assuming the shall is running at a constant speed is 750lbf.

The segment flexes due to the bending moment, and the section rotates due to the torque (torsional moment). A machine member is said to be in torsional when it is subjected to two equal and opposite couplings acting in a parallel plane. Torsional shear stress is the name for the tension that torsion creates. At the centroidal axis, it is zero, and at the outside surface, it is highest.

Ф= 20∘

 FA=300 lbf

d=1.25in

summation Mt => f cos 20∘ x 4 = 300 cos20∘ x 10

     Fb => 750lbf.

a technique for determining out the optimal number of preload or initial axial compression between two tapered roller bearings. Two forces often act on a bearing since it typically enables a shaft to easily rotate about a rotational axis: a circular

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The existence of this reference frame violate causality: No, existence of this reference frame would violate causality. The correct option is C.

What is Reference Frame?

A reference frame, also known as a frame of reference, is a set of coordinate axes and a set of rules or conventions used to define the position, orientation, and motion of objects in a physical system. It provides a framework for describing and analyzing the motion and interactions of objects relative to a chosen point or system of coordinates.

In physics, reference frames are used to establish a consistent and standardized way of measuring and describing the physical quantities, such as position, velocity, acceleration, and forces, of objects within a particular system or observation.

In the theory of special relativity, the order of events is preserved for all inertial observers. This means that if event 1 (firing of the bullet) precedes event 2 (shattering of the soda bottle) in one inertial reference frame, it will also precede event 2 in all other inertial reference frames.

The concept of causality is based on the idea that cause and effect follow a definite chronological order, where the cause precedes the effect. If there were an inertial reference frame in which event 2 precedes event 1, it would violate causality because it would imply that the effect (shattering of the soda bottle) occurs before the cause (firing of the bullet).

According to the principles of special relativity, the speed of light is the same for all inertial observers, and the order of events is absolute. Therefore, there is no inertial reference frame in which event 2 precedes event 1, and the existence of such a reference frame would violate causality. C, is the right option.

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The velocity after 2 seconds is 26 m/s. It takes 11.50 seconds to reach a velocity of 40m/s.

Given the equation s(t) = 6t + 5t²

Let's find the velocity after 2 seconds.

(a) Velocity = (ds)/(dt)

Differentiating s(t) with respect to t, we get; ds(t) / dt = 6 + 10t

At t = 2,ds(t) / dt = 6 + 10t = 6 + 10(2) = 26m/s

Therefore, the velocity after 2 seconds is 26 m/s.

(b) We are to find how long it takes for the velocity to reach 40m/s. We know that the initial velocity of the ball, u = 6m/s. Acceleration = gsinθ = 9.81 x sin (angle of inclination) = 9.81 x 0.3 = 2.943 m/s²From the first equation of motion, v = u + at

We know v = 40m/s, u = 6m/s, a = 2.943m/s² and t is what we are to find, hence the equation becomes;40 = 6 + 2.943(t)t = (40 - 6) / 2.943t = 11.50s

Therefore, it takes 11.50 seconds to reach a velocity of 40m/s.

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Answer:

yes the formula of pressure is P = F/A

Answer:

yes it is

Explanation:

It's important to know that nuclear fusion consists of two nuclei with low mass numbers combining to form a single nucleus with higher mass numbers. On the other hand, nuclear fission is about the opposite phenomena because the atom splits, releasing a great amount of energy.

The correct answer is C) they both are powered by wind, as hydrokinetic power is generated by the movement of tides and waves. Wind and hydrokinetic power both involve the use of turbines to generate electricity, and both have minimal environmental impacts.

The statement that is not true about wind and hydrokinetic power is "they both are powered by wind. A rotor blade connected to a shaft converts kinetic energy from the wind into mechanical energy. This mechanical energy is used to rotate a shaft. The shaft is connected to a generator, which converts mechanical energy into electrical energy in a wind turbine. Hydrokinetic power, on the other hand, harnesses the energy of moving water, such as ocean waves or tides, and converts it into electricity.

Turbines are used to harness the kinetic energy of moving water and convert it into electrical energy. Thus, statement c) which says that wind and hydrokinetic power both are powered by wind is false as hydrokinetic power uses the energy of moving water.

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Answer:A. argon(Ar)

Argon is commonly considered to be a chemical by most people

Answer:

The projectile's horizontal speed is constant throughout the entire trajectory because gravity only acts downwards in the vertical direction.

Explanation:

I did this in Physics a while ago but I believe my answer is correct.

Hope this helps! (:

Answer:

bo sure but I think its c or a

Steve's negligence in leaving the truck's motor running in neutral and forgetting to set the parking brake resulted in a series of events that caused the truck to crash into a gas station pump.

Steve, a driver for QRI, made a careless mistake while making a delivery. He left the truck's motor running in neutral and forgot to set the parking brake. As a result, the truck rolled and crashed into a nearby gas station pump. This caused a fire to ignite, which spread quickly to a construction site a block away.

There are several factors at play here that contributed to the chain of events. First, leaving the truck's motor running in neutral allowed it to move freely without any control. Second, forgetting to set the parking brake meant there was no additional mechanism to keep the truck stationary.

The collision with the pump caused a rupture, resulting in a fuel leak. The ignition source, possibly a spark or heat from the impact, ignited the fuel and started a fire.

The fire then spread to the nearby construction site. Construction sites often contain materials that are combustible, such as wood, paint, or fuel. The proximity of these materials to the gas station allowed the fire to easily extend to the construction site.

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