Based on law conservation of mass , which of the following is a true statement

A) The mass of the products is always greater than the mass of the materials which react in a chemical change

B) The mass of a product is always less than the mass of materials which react in a chemical change

C) Matter is neither lost nor gained during a chemical change

D) A certain mass is a material must be present for a reaction to occur

When a meter stick is moving directly towards you, your measurement of the speed of the headlight light will still be approximately 299,792 kilometers per second (the speed of light).

The speed of light is constant and doesn't change based on the observer's relative motion, according to the theory of special relativity developed by Albert Einstein. When the meter stick (or any object) with a headlight is moving towards you, the light emitted from the headlight travels at the same speed (approximately 299,792 km/s) as it would if the meter stick were stationary.

This is because the speed of light is the same for all observers, regardless of their motion or the motion of the light source. Thus, your measurement of the speed of the headlight light remains constant, irrespective of the movement of the meter stick.

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Answer:

B. 2.77 x \(10^{-4}\) N

Explanation:

The required force can be calculated by:

F = \(\frac{Kq_{1}q_{2} }{d^{2} }\)

Where F is the force between the particles, K is the coulomb's constant (9 x \(10^{9}\) \(Nm^{2}/C^{2}\)), \(q_{1}\) is the charge on the first particle, \(q_{2}\) is the charge on the second particle and \(d^{2}\) is the distance between the particles.

So that:

F = \(\frac{9*10^{9}*2.15*10^{-9} *3.22*10^{-9} }{(0.015)^{2} }\)

  = \(\frac{6.2307*10^{-8} }{(2.25*10^{-4} }\)

  = 2.7692 x \(10^{-4}\)

 The force between the particles is 2.77 x \(10^{-4}\) N.

Answer:

b

Explanation:

a pex

The equation used to calculate required fastener torque as a function of desired preload and bolt size is τ = K D \(F_{i}\).

τ = K D \(F_{i}\)

\(F_{i}\) = σ\(_{t}\) * A\(_{t}\)

σ\(_{t}\) = 0.9 * σ\(_{y}\)

τ = Torque

K = Torque co-efficient

D = Nominal bolt diameter

\(F_{i}\) = Desired preload

σ\(_{t}\) = Tensile stress

A\(_{t}\) = Tensile stress area

σ\(_{y}\) = Ultimate yield strength

Therefore, the equation used to calculate required fastener torque as a function of desired preload and bolt size is τ = K D \(F_{i}\).

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The steel ball in Challenge example 11.11 did not reach the full 45 degrees because of the air resistance.

When an object moves through the air, it has to overcome the force of air resistance, which opposes the motion of the object. This force is proportional to the surface area of the object and the speed at which it moves through the air. Therefore, the faster an object moves through the air, the more air resistance it experiences.

In the case of Challenge example 11.11, the steel ball was released at an angle of 45 degrees, but as it moved through the air, it experienced air resistance, which slowed it down. As a result, it did not reach the full 45 degrees and only reached an angle of 19 degrees. This is because the force of air resistance acting on the ball increased as it moved through the air, and this force eventually became greater than the force of gravity acting on the ball.

As a result, the ball slowed down and did not reach the full 45 degrees.

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Answer:

The answer is False

Hope this helps you

It is false that a neutral atom has the same number of protons as it does neutrons. The correct option is B.

The claim that "A neutral atom has the same number of protons as it does neutrons" is untrue. Protons and electrons in a neutral atom are equal in number, but neutron counts can change.

Electrons have a negative charge, whereas protons have a positive charge. A neutral atom has a net charge of zero because the protons' positive charge is balanced by the electrons' negative charge.

Neutrons don't have an electric charge, though. Within a single element, the amount of neutrons can change, giving rise to many isotopes.

Isotopes contain the same amount of protons, but their atomic masses vary depending on how many neutrons they have.

Thus, the correct option is B. False.

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Answer:

Cylinder A has Plasma

Explanation:

The question is incomplete because the figure is not given in the question. I have attached the figure at the bottom for this question. Consult it for better understanding.

We can discard the options C and D as C shows a the characteristics of a liquid (fixed volume) while D shows the characteristics of a solid (fixed shape and volume)

Plasma is basically a state, which is a lot similar, yet different to the state of gas. Like gases, it doesn't have a fixed shape or volume, but unlike gases, it has only charged particles. A plasma can be considered as a charged gas.

As A shows charged ions, while in B, these ions are in pair and are neutralized, we can say that the charged gas is in A. Therefore, option A has plasma

Answer:

C

Explanation:

answer on edge 2021-2022

Hope this helps!!

Answer:

Basketball players

Explanation:

Basketball players

Main answer- the measure of pH of 6.M of water sample is  slightly acid

supporting answer - The pH of water indicates how acidic or basic it is. The scale runs from 0 to 14, with 7 representing neutral. pHs less than 7 indicate acidity, while pHs greater than 7 indicate baseness. The pH of water is an extremely important indicator of water quality.

final answer hence the ph of water is slightly acid

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Answer:

2.05 Ω

Explanation:

We are here given that the

We need to find out the resistance of the given wire . As we know that,

\(\implies R = \rho \dfrac{l}{A} \\\)

\(\implies R =\rho \dfrac{ l}{\pi r^2} \\\)

\(\implies R =\rho \dfrac{l}{\pi \dfrac{d^2}{4}} \\\)

\(\implies R =\rho \dfrac{4l}{\pi d^2}\\\)

substitute the respective values,

\(\implies R = 1.720 \times 10^{-8}\times \dfrac{4\times 5000m}{3.14\times (0.74\times 10^{-2}} \\\)

\(\implies\underline{\underline{ R = 2.05 \Omega }} \\\)

and we are done!

Answer:

The initial temperature of the metal was 94.24⁰C.

The initial temperature of the metal is calculated as follows;

Q = mcΔθ

where;

Δθ = Q/mc

Δθ = (3,300) / (0.854 x 150)

Δθ = 25.76⁰C

Δθ = T₂ - T₁

T₁ = T₂ - Δθ

T₁ = 120 - 25.76

T₁ = 94.24⁰C

Thus, the initial temperature of the metal was 94.24⁰C.

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Answer:

A force that acts on a body moving in a circular path and is directed toward the center around which the body is moving.

Explanation:

Answer: a force that acts on a body moving in a circular path and is directed toward the center around which the body is moving.

Explanation: It is drawn into the center of the moving body like a whirl pool  

The mass of the given will be 20kg.

By using formula,

force = mass x acceleration

mass = force / acceleration

mass = 400 N / 20m/s²

mass = 20 Kg

Acceleration is the rate at which an object's velocity with respect to time changes. They are vector quantities, accelerations. The direction of the net force acting on an object determines the direction of its acceleration.

Any process where the velocity changes is referred to as acceleration. There are only two ways to accelerate: changing your speed or changing your direction, or changing both. This is because the velocity is both a speed and a direction.

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Answer:

The horizontal component of the force, \(F_x= 34.24 \ N\)

The  vertical component of the force, \(F_y=7.28 \ N\)

Explanation:

Given;

Force on the rope, F = 35 N

angle between the rope and the horizontal = 12 °

The horizontal component of the force is given by;

\(F_x = Fcos \theta\\\\F_x = 35cos(12^0)\\\\F_x = 34.24 \ N\)

The vertical component of the force is given by;

\(F_y = Fsin\theta\\\\F_y = 35sin(12^0)\\\\F_y = 7.28 \ N\)

Answer:

p=I×B

Explanation:

If a current 'I' flows through a given element in your circuit, losing voltage 'V' in the process, then the power 'P' dissipated by that circuit element is the product of that current and voltage.

The main driving force thought to be behind the slowing of the Gulf Stream is believed to be climate change. As the atmosphere and oceans warm, the Gulf Stream is losing heat to the atmosphere.

The Gulf Stream is a powerful ocean current that originates in the Gulf of Mexico and flows northward along the eastern coast of the United States. It is part of the North Atlantic gyre, a system of circulating ocean currents. The Gulf Stream is an important part of the global conveyor belt, a system that helps regulate the ocean's climate by transporting warm tropical waters to cooler regions of the world. The Gulf Stream is so powerful that it is able to move more water than all of the world's rivers combined. It transports more than 100 million cubic meters of water per second and has a maximum speed of up to 5.6 km per hour.

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Answer:

Vaccines contain weakened or inactive parts of a particular organism (antigen) that triggers an immune response within the body. Newer vaccines contain the blueprint for producing antigens rather than the antigen itself.

Answer: They give  you a portion of the thing its fighting so it gets your cells use to it so they can fight it off easily

Explanation:

For compound microscope:  the objective lens produces a real, inverted image that is then magnified by the eyepiece lens to produce an upright, virtual image.

For simple microscope: The objective lens produces a real, inverted image that is viewed directly by the eye without the need for an eyepiece lens.

For telescope: The objective lens or mirror produces a real, inverted image that is then magnified by the eyepiece lens to produce an upright, virtual image. The eyepiece can be positive or negative depending on the desired magnification.

The following are some signs (positive or negative) of objective and eyepiece lenses in microscopes and telescopes:

Objective lens:

Eyepiece lens:

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When you turn while moving, your speed zeros out before rising.

What is instantaneous speed?

The speed of an object can change as it moves. The speed of an object at a certain instant of time is known as the instantaneous speed. If the position is a function of time, then the speed depends on the change in the position as time changes.

Turning around while moving causes your speed to drop to zero before rising in the opposite direction at the same location.

While you might maintain a steady pace if you made a semicircle turn, you wouldn't be traveling along the same road in the other direction.

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a) Gravitational potential energy possessed by the apple is E = 1.47 J.

b) Kinetic energy at the moment of collision of the apple is E = 1.47 J.

   The initial speed of the apple is 3.92 m/s.

c) The speed with which the apple hits the ground is 5.42 m/s.

a) Gravitational potential energy possessed by the apple:

Given that the apple weighs 100 g, located at a height of 1.5 m, the gravitational potential energy can be calculated as follows:

E = mgh = 0.1 kg × 9.8 m/s² × 1.5 m = 1.47 J

b) Kinetic energy at the moment of collision of the apple:

Kinetic energy can be calculated using the formula:

K.E. = 1/2 mv² where m is the mass of the apple and v is the velocity of the apple.

Initially, the apple is at rest. The potential energy of the apple transforms into kinetic energy as the apple falls.The potential energy calculated above is transformed into kinetic energy when the apple reaches the ground.

Therefore,

1.47 J = 1/2 × 0.1 kg × v²v² = 2 × 1.47 J/0.1 kgv² = 29.4v = √29.4v = 5.42 m/s

c) Speed with which the apple hits the ground:

The velocity of the apple can be calculated as follows:

v² = u² + 2gh

where u is the initial velocity of the apple and h is the height from which the apple falls.

u² = v² - 2gh = 5.42² - 2 × 9.8 × 1.5 = 15.37u = √15.37u = 3.92 m/s

Therefore, the initial speed of the apple is 3.92 m/s and the speed with which the apple hits the ground is 5.42 m/s.

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If a 0.3% decrease in the price of a good causes its quantity supplied to decrease by 1%, then the supply is C. Inelastic.

In this scenario, the supply of the good is considered inelastic. The elasticity of supply measures the responsiveness of the quantity supplied to changes in price. When the price of a good decreases, and the quantity supplied decreases by a larger percentage, it indicates that the supply is relatively unresponsive to price changes.

To determine the elasticity of supply, we compare the percentage change in quantity supplied to the percentage change in price. In this case, a 0.3% decrease in price results in a 1% decrease in the quantity supplied. Since the percentage change in quantity supplied (1%) is greater than the percentage change in price (0.3%), the supply is considered inelastic.

Inelastic supply means that producers are less responsive to price changes, and a small change in price leads to a proportionally smaller change in quantity supplied. In such cases, producers may find it challenging to adjust their output levels quickly in response to price fluctuations.

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Answer:

Place some smooth tiles under the dresser

Smooth surfaces, like smooth tile, are easy to slide over. They create very little friction. Rough surfaces like carpet create much more friction.

remove the drawers from the dresser

Weight affects friction in that friction is directly proportional to the weight of the load one is moving. So reduce the weight, reduce the friction.

Explanation:

Speed does not impact friction, so moving the dresser slower won't help. Wind has nothing to do with the scenario, so that's not a correct option.

Electric and hydrogen are promising alternative energy sources for transportation, offering benefits such as reduced emissions and lower operating costs, although they also face challenges related to infrastructure and production methods.

Electric and hydrogen are two promising alternative energy sources for transportation that have gained significant attention in recent years. Here are some key points about each:

Electric Vehicles (EVs): EVs use electricity stored in batteries to power an electric motor.

They offer several advantages, including zero tailpipe emissions, reduced dependence on fossil fuels, and lower operating costs compared to traditional internal combustion engine vehicles.

The growth of EV infrastructure and advancements in battery technology have contributed to their increasing popularity.

Hydrogen Fuel Cell Vehicles (FCVs): FCVs use hydrogen gas to generate electricity through a chemical reaction in a fuel cell, which then powers an electric motor. FCVs produce zero tailpipe emissions since the only byproduct is water vapor.

Hydrogen fuel can be refueled quickly, similar to traditional gasoline vehicles, providing a longer driving range compared to battery-powered EVs.

Both electric and hydrogen vehicles have their own set of challenges. For EVs, limited charging infrastructure and range anxiety remain concerns, although they have been improving over time.

Hydrogen FCVs face challenges related to hydrogen production, storage, and distribution infrastructure.

Additionally, the overall environmental impact of these alternative energy sources depends on the methods used for electricity or hydrogen production.

The adoption of alternative energy sources for transportation is a complex and evolving field.

It often involves a combination of technological advancements, policy support, and infrastructure development to enable widespread adoption and address existing challenges.

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Answer:

The apparent weight of a freely falling body is zero. When a body falls freely, it is falling with an acceleration =g. Thus the entire gravitational force acting on it is utilized in accelerating it and hence its weight is not felt.

Answer:

(a)   the gravitational influence on visible matter can not be explained by matter that can be seen.

Answer:

induction

Explanation:

a change in current (the pulse) causes a change in the magnetic field resulting from that current. the nearby wire is inside that magnetic field. when that magnetic field changes, it induces a current in any nearby conductor. the amount of current induced depends on the strength of the field and the distance between the conductors.

Answer:

28 N

Explanation:

From the question given above, we were told that 10 N force and 18 N force act in the same direction on the object.

The net force acting on the object can be obtained by simply adding both forces together since they both act on the object in the same direction. This is illustrated below:

Force 1 (F₁) = 10 N

Force 2 (F₂) = 18 N

Net force (Fₙ) =?

Fₙ = F₁ + F₂ (since they both act in the same direction)

Fₙ = 10 + 18

Fₙ = 28 N

Therefore, the net force acting on the object is 28 N.

Velocity of the satellite that is orbiting earth is 83.45m/s, which makes the velocity of the rivet relative before striking also 83.45m/s and the time duration of collision is 4.53× 10⁻⁵ s. The avg force that is exerted by the rivet on the satellite is 9.27N and the energy that is generated by the collision is 1.63J.

a) Velocity of the satellite in an orbit 900 km above Earth's surface can be calculated as follows: Formula: `v = sqrt(GM/r)` Where,v = velocity, M = Mass of Earth, r = radius of the orbit (r = R + h)R = radius of the Earth = 6.37 × 10⁶ mh = height above Earth's surface = 900 km = 9 × 10⁵ mG = 6.67 × 10⁻¹¹ N m²/kg²By substituting the given values, we getv = sqrt((6.67 × 10⁻¹¹ × 5.97 × 10²⁴)/(6.37 × 10⁶ + 9 × 10⁵))= sqrt(6.965 × 10³) = 83.45 m/s.

Therefore, the velocity of the satellite in an orbit 900 km above Earth's surface is 83.45 m/s.

b) Velocity of the rivet relative to the satellite just before striking it can be calculated as follows: Velocity of the rivet, `v_rivet = v_satellite * sin(θ)`Where, v_satellite = 83.45 m/sθ = 90°By substituting the given values, we getv_rivet = 83.45 * sin 90°= 83.45 m/s.

Therefore, the velocity of the rivet relative to the satellite just before striking it is 83.45 m/s.

c) The time duration of collision, `Δt` can be calculated as follows:Δt = (2 * r_rivet)/v_rivet, Where,r_rivet = radius of the rivet = 3/2 × 10⁻³ m. By substituting the given values, we getΔt = (2 * 3/2 × 10⁻³)/83.45= 4.53 × 10⁻⁵ s.

Therefore, the time duration of collision is 4.53 × 10⁻⁵ s.

d) The average force exerted by the rivet on the satellite, `F` can be calculated as follows: F = m_rivet * Δv/ΔtWhere,m_rivet = mass of the rivet = 0.5 g = 0.5 × 10⁻³ kgΔv = change in velocity of the rivet = 83.45 m/sΔt = time duration of collision = 4.53 × 10⁻⁵ sBy substituting the given values, we get F = (0.5 × 10⁻³ * 83.45)/4.53 × 10⁻⁵= 9.27 N.

Therefore, the average force exerted by the rivet on the satellite is 9.27 N.

e) The energy generated by the collision, `E` can be calculated as follows: E = (1/2) * m_rivet * Δv²Where,m_rivet = mass of the rivet = 0.5 g = 0.5 × 10⁻³ kgΔv = change in velocity of the rivet = 83.45 m/s. By substituting the given values, we getE = (1/2) * 0.5 × 10⁻³ * 83.45²= 1.63 J.

Therefore, the energy generated by the collision is 1.63 J.

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The spring constant of Bubba's truck suspension is approximately 28678.76 N/m, and the period of oscillation for the resulting bouncing of Bubba's truck is approximately 0.941 seconds.

a) The spring constant of Bubba's truck suspension is approximately 28678.76 N/m.

The spring constant can be calculated using Hooke's Law, which states that the force exerted by a spring is proportional to the displacement from its equilibrium position. In this case, the weight of the equipment hanging from the truck's suspension causes the sag. By equating the weight of the equipment to the force exerted by the suspension, we can solve for the spring constant.

b) The period of oscillation for the resulting bouncing of Bubba's truck is approximately 0.941 seconds.

The period of oscillation can be determined using the formula T = 2π√(m/k), where T is the period, m is the mass of the system, and k is the spring constant. By considering the total mass of the truck and the equipment as the system mass, and substituting the values into the formula, we can calculate the period of oscillation.

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Answer:

B

Explanation:

When the ball is dropped, Earth's mass generates a gravitational force, making it fall downward towards the ground.