What does it mean to say that mass is conserved during a physical change?

The velocity of a bullet does not change throughout its course when there is no air resistance.

An object that is propelled by the application of an external force and then moves freely while being affected by gravity and air resistance is referred to as a projectile. Projectiles are generally used in sports and warfare, despite the fact that any item traveling through space is a projectile.

The forces that oppose an object's relative motion as it travels through the air are known as air resistance. These drag forces counteract the speed of the approaching flow, slowing the object down.

The velocity of a bullet does not change throughout its course when there is no air resistance.

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The total oxygen atoms that are exprected in the vinegar and baking soda reaction is three oxygen atoms.

Answer: B. 3

why;live

Answer: D. 5

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical equation will be:

[tex]C_2H_4O_2+NaHCO_3\rightarrow CH_3COONa+H_2O+CO_2[/tex]

Thus there are 2 atoms of oxygen in vinegar and 3 atoms of oxygen in baking soda. Which means there are 5 oxygen atoms on reactant side.

Thus the products must also have 5 oxygen atoms.

The answer is Great Chilean, 9.5.

Answer:

Great Chilean, 9.5

Explanation:

Great Chilean earth quake also known as 1960 Valdivia earthquakes. It is the most powerful earthquake ever which is recorded on 22 May 1960.

Various studies suggests that it is placed at between 9.4–9.6 on the scale of magnetic moment.

It occurred in the afternoon and last long for about 10 minutes of period. Then the resulting Tsunami affects the Southern Chile, Japan, Hawaii, the Philippines, Eastern New Zealand and Southern Australia.

And the epicenter of this earthquake is about 570 km.

There will be the following forces:

Force of gravity directly down.

The normal force perpendicular to the hill.

The braking force directed uphill.

The frictional force directed uphill.

All components of the force acting on the car are:

• The Normal force perpendicular to the surface of the car.

• The force of gravity in downhill direction.

• The breaking force in the uphill direction.

• The friction force in the uphill direction.

Further Explanation:

Free body diagram is the graphical representation or illustration of all the forces applied on the body with their directions. This helps us to visualize all the applied forces on the body with their directions and make us possible to solve complex problems based on kinematics.

Given:

The inclination of the road is [tex]20^\circ[/tex].

Concept:

The free body diagram is drawn as shown in Figure 1.

The car is moving on incline hill making an angle [tex]20^\circ[/tex] with the plane surface. When sudden break is applied to the car it skids to some distance. As soon as the brakes are applied, the car experiences a friction force due to brakes and starts slowing down.

The friction force offered by the hill is dependent on the normal force which is equal to the component of the weight acting perpendicular to the road.

The coefficient of static friction [tex]\mu[/tex] is depend upon the nature of surface of the irregularities. The friction force acts in the direction opposite to the motion.

The car has its normal force and it is the component of the contact force which is always perpendicular to the surface of the object.

The car has component of the force in the downward direction along the hill due to gravity called as weight. It’s magnitude depend upon the mass of the body and expressed as [tex]mg[/tex]. the term [tex]g[/tex] is called acceleration due to gravity and it has a constant value of [tex]9.81\text{ m/s}^2[/tex].

Therefore, the all the force acting on the car are given below.

• The Normal force perpendicular to the surface of the car.

• The force of gravity in downhill direction.

• The breaking force in the uphill direction.

• The friction force in the uphill direction.

Learn more:

1.  A 30kg box being pulled across a carpted floor https://brainly.com/question/7031524

2.  Acceleration of a body https://brainly.com/question/9719731

Answer Details:

Grade: Middle school

Subject: Physics

Chapter: Kinematics

Keywords:

Friction, acceleration, slammed, break, car, skidding, net stop, going down, 20degree, hill, components, force, force acting on car, weight, normal.

B. Friction can be a centripetal force, such as when it keeps a car on the road going around a curve.

C. Gravity can be a centripetal force, such as when it pulls a satellite in its orbit.

Explanation:

The centripetal force is any force that keeps an object moving in circular motion, "pulling" the object towards the centre of the circular trajectory.

Several forces can act as centripetal force. Examples are:

- friction: when a car is going around the curve, is moving by circular motion. The force that keeps the car in circular motion is, in fact, the friction between the tires and the road.

- Gravity: when a satellite moves around the Earth, it is moving by circular motion. The force that keeps the satellite in circular motion is the gravitational attraction between the Earth and the satellite, that pushes the satellite towards the Earth.

The other two options are not correct because:

A) An object can also accelerate if there is no centripetal force (for example, a car speeding up on a straight road is accelerating, but there is no centripetal force since there is no circular motion

D) Centripetal force is not an outward force, since it pushes the object inwards (towards the centre of the trajectory).

9.45 × 1013 J

einstein's mass energy equivalence equation

The energy equivalent of mass is [tex]9.45[/tex]×[tex]10^{13} J[/tex]. It is related to the mass- energy equivalent.

It is relation between mass and energy in a stationary frame. If a body is of mass (m) is moving with the speed of light (c), the formula will be,

[tex]E = m.c^{2}[/tex]

                                                      (c) = [tex]3[/tex]×[tex]10^{8} m/s[/tex]

       [tex]E =1.05[/tex]×[tex]10^{-3}[/tex]×[tex](3*10^{8} )^{2}[/tex]

            [tex]=1.05[/tex]×[tex]10^{-3}[/tex]×[tex]9[/tex]×[tex]10^{16}[/tex]

             [tex]= 9.45[/tex]×[tex]10^{13} J[/tex]

The energy equivalent is [tex]9.45[/tex]×[tex]10^{13} J[/tex]

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Final answer:

Across a resistor in a circuit, the potential decreases due to the resistance. This potential drop is determined by the current in the circuit and the resistance value according to Ohm's Law (V = IR).

Explanation:

Across a resistor, the potential decreases. This is because the resistor causes a potential drop, which is the product of the current flowing through the resistor and the resistance of the resistor (Ohm's Law, V = IR). If we consider a simple electrical circuit where current flows from a battery through a resistor, as the current "passes through" the battery, the potential of the electrical energy increases by a value V, representing the voltage of the battery.

However, as the current then "passes through" the resistor, the potential energy of the charges is converted into other forms of energy like heat, leading to a decrease in potential by the value given by the product of the current (I) and the resistance (R) of the resistor.

The wires connecting the components in the circuit, assuming they have negligible resistance, do not cause a significant change in voltage. Therefore, as current travels through these wires, the voltage remains constant.

Given:

Mass of the skydiver:55 Kg

Velocity of the skydiver (v): 16m/s

Kinetic energy= 1/2mv^2

Kinetic energy= 1/2(55x16x16)

Kinetic energy= 7040J

Final answer:

The kinetic energy of a 55.0-kg skydiver reaching a velocity of 16.0 m/s is calculated using the equation KE = 1/2 mv², resulting in an energy of 7,040 Joules.

Explanation:

The question is asking to calculate the kinetic energy of a 55.0-kg skydiver who reaches a velocity of 16.0 m/s. Kinetic energy (KE) can be found using the equation KE = 1/2 mv², where m is mass and v is velocity.

Let's insert the values into the equation:

KE = 1/2 × 55.0 kg × (16.0 m/s)²

KE = 1/2 × 55.0 kg × 256 m²/s²

KE = 27.5 kg × 256 m²/s²

KE = 7040 Joules

Therefore, the kinetic energy of the skydiver when he reaches a velocity of 16.0 m/s is 7,040 J.

The density of a substance is the ratio of its mass to its volume. So whatever volume you have (call it [tex]V[/tex]), the density [tex]\rho[/tex] is computed by

[tex]\rho=\dfrac{200\,\mathrm g}V[/tex]

The density of the macaroni cannot be calculated without knowing the volume. If volume is available, density can be computed by dividing mass by volume.

In the realm of Physics, density is determined by the ratio of mass to volume, typically in units of grams per cubic centimeter (g/cm³). To find the density of an object, you simply divide the mass by the volume. However, in the context of your question, we are not provided with the volume calculated in question 7a.

Without the volume, the calculation of density can't be completed. If we have the volume, the formula to calculate the density would be Density = Mass / Volume. So for example, if the macaroni's volume was 50cm³, then the density would be 200g / 50cm³ = 4g/cm³.

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1. Height of cube =9cm

mass of cube= 3645 g

volume= length ×breadth× height

as cubic volume so length breadth and heights are same so

volume =height ×height ×height

V =9cm×9cm×9cm= 729cm³

density =mass/ volume

density =3645g/729cm³

density= 5g/cm³

2.  AS DENSITY = mass/volume

volume =mass/ desity

volume= 13.558g/(0.089g/l)

volume= 0.152L³

Density = mass/volume

#1). The mass is given. And knowing the length of a cube's side, you can calculate its volume.

Volume = mass/density

#2). The mass and density are both given.

Protons are usually regarded by their mass, as mass is not specific to any gravitational acceleration.  However, if you wished to find the weight of a proton on Earth, it would be:

Force (weight) = mass of proton * acceleration due to Earth's gravity

F = ma

F = (1.62 x 10^-27)(-9.8)

F = 1.5876 * 10^-26N

Final answer:

The weight of a proton can be calculated using the formula W = mg, where W is weight, m is mass, and g is the acceleration due to gravity. Using the given mass of the proton and the acceleration due to gravity on Earth, we can calculate its weight to be approximately 1.64 x 10^-26 N.

Explanation:

The weight of an object is the force exerted on it due to gravity. The formula to calculate weight is W = mg, where W is the weight, m is the mass of the object, and g is the acceleration due to gravity. In this case, the mass of the proton is 1.672 x 10-27 kg.

To calculate the weight of the proton, we need to know the acceleration due to gravity. On Earth, the acceleration due to gravity is approximately 9.8 m/s2. Using this value, we can calculate:

W = (1.672 x 10-27 kg) x (9.8 m/s2) = 1.64 x 10-26 N

Therefore, the weight of the proton is approximately 1.64 x 10-26 newtons.

Because water is more dense than the object but rubbing alcohol is less dense than the object

An object floats or sinks based on the densities of the object and the fluid. Water's higher density and surface tension compared to rubbing alcohol enables certain objects to float in it but sink in rubbing alcohol.

The object's ability to float or sink in a fluid depends on the densities of the object and the fluid. If the object's average density is less than that of the fluid it will float. This is because the fluid, having a higher density, contains more mass and hence more weight in the same volume. The buoyant force which equals the weight of the fluid displaced is thus greater than the weight of the object. On the other hand, an object denser than the fluid will sink.

Water has a higher density than rubbing alcohol thus objects that can float in water may sink in rubbing alcohol if their density is greater than that of the alcohol. Additionally liquids such as water exhibit properties such as cohesion and surface tension which can support objects denser or heavier than the water to some extent until the surface tension is broken. However the surface tension of rubbing alcohol is significantly lower than that of water affecting the floating capability of the object.

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If Earth's rotational speed decreased by 25%, then it would take 25% longer to rotate once.

-- A full cycle of day and night would take (1.25) x (24 hours) = 30 hours.

-- The average length of daylight/darkness over a whole year would be 15 hours each.

-- Daytime-high temperatures would be hotter everywhere, because the sun would be up longer.  Night-time-low temperatures would be colder, because the sun would stay down longer.

-- Changes in the weather would be more drastic, and winds would generally be stronger, because of the greater contrast between warm areas and cold areas.      BUT ...

-- High-pressure areas, low-pressure areas, hurricanes, typhoons, tornadoes, water going down the drain, dust devils, and Foucault pendulums, would all spin slower, because of the decrease in the Coriolis force.  

-- There would be only 292 days in a year.

-- Every star in the sky would rise almost 5 minutes later each night than it rose the night before.

-- On the average, the moon would rise every day 61 minutes later than it rose the day before.  Once the moon rose, it would be in the sky for about 16 hours before it crossed the sky and set on the other side.

-- From one Full Moon to the next one would be only about 23.6 days.

-- Each crescent and gibbous moon phase would last only about 5.9 days, instead of about a week as it does now.

-- When you went to bed, you could stay there and veg out for 10 hours.  But don't get excited yet ... Once you got out of bed, you couldn't go back for another 20 hours !

-- Instead of waking up hungry and crying to be fed 3 times during the night, newborn babies would do it 4 times every night.  New mothers wouldn't like it at all.

-- The standard work day and the standard school day would probably each grow to 10 hours instead of 8 hours.  Bummer.

Pluto is now classified as a dwarf planet because of a change in the definition of a planet adopted by the International Astronomical Union (IAU) in 2006. It must orbit the Sun, It must be spherical in shape or have a nearly round shape, and It must have cleared its orbit of other debris.

The IAU's new definition of a planet states that for a celestial body to be considered a planet, it must meet three criteria:

1) It must orbit the Sun.

2) It must be spherical in shape or have a nearly round shape.

3) It must have removed any additional trash from its orbit.

While Pluto meets the first two criteria, it fails to satisfy the third criterion. The reclassification was a result of advancements in our understanding of celestial objects beyond Pluto and the desire to have a more precise and consistent definition of what constitutes a planet.

Therefore, Pluto is now classified as a dwarf planet because of a change in the definition of a planet adopted by the International Astronomical Union (IAU) in 2006.

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D. Water breaking down into hydrogen and oxygen

The mainly three types of directions exits between velocity and acceleration.

The velocity and acceleration are the vector quantities as having both magnitude and direction. To direction of both factors depends upon the speed. for example, we take a car to observe the direction of these two factors, then there will be no direction when the car is at rest.

When the car moves at uniform velocity then its direction will be forward but there will be no direction of acceleration.

When the car moves with increasing speed continuously, then the direction of velocity and acceleration will be parallel.

When the car is at speed and trying to slow down its speeds, it will create acceleration. In this case, the direction of velocity and acceleration will be in the opposite.

Anthropology is a social science that deals with the history of man. ... This is the main difference between social science and natural science. Sciences such as logic, mathematics, and statistics are called as formal sciences and they too are different from natural sciences.

The number of neutron in the atom of the isotope is  50.

Isotopes are different nuclear species—technically, nuclides—of the same element. They both belong to the same chemical element and have the same atomic number (number of protons in their nuclei), but they have distinct nucleon numbers (mass numbers) because they have different numbers of neutrons in their nuclei.

Although the chemical properties of all isotopes of a given element are almost identical, their atomic weights and physical characteristics vary.

The atomic mass of yttrium atom of the isotope is = 89

The atomic number of yttrium atom is = 39

Hence, the proton number of the atom of the isotope is = 39

Total number of proton and neutron in the atom of the isotope is = 89

Therefore, the number of neutron in the atom of the isotope is = 89 -39 = 50.

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your answer is c) Ends

As can be visualized with the magnetic field lines, the magnetic field is strongest inside the magnetic material. The strongest external magnetic fields are near the poles. A magnetic north pole will attract the south pole of another magnet, and repel a north pole.

Answer: The correct answer is "Ends".

Explanation:

Bar magnet is a permanent magnet.

Bar Magnet has two poles: North pole and South pole.

Same poles repel each other and the opposite poles attract each other.

The magnetic field lines originates from the north pole and ends at the south pole.

The magnetic filed lines are surrounding of the magnet in which the magnetic force can be experienced. The magnetic fields are stronger near the poles of the magnet. As the distances decreases from the poles, the magnetic fields lines get weaker.

Therefore, the correct option is (C).

The student accelerated at a rate of 0.2 m/s², calculated using the final and initial velocities, and the time taken to change velocity.

To calculate the acceleration of the student moving from 1 m/s to 3 m/s in 10 seconds, we can use the formula for acceleration, which is Δv/Δt, where Δv is the change in velocity and Δt is the time taken to change the velocity.

Here, the initial velocity (u) is 1 m/s, the final velocity (v) is 3 m/s, and the time (t) is 10 seconds. The change in velocity (Δv) is v - u = 3 m/s - 1 m/s = 2 m/s. The time (Δt) is 10 seconds. Therefore, the acceleration (Δv/Δt) is 2 m/s / 10 s = 0.2 m/s².

The student therefore accelerated at 0.2 m/s².

Element is is a substance that cannot be broken down into a simpler substance

Atom is the basic unit of an element

Particle a tiny piece of matter

A phase is  a unique form of matter in which it can exist

Anything which has mass and occupies spaces is known as matter, mainly there are four states of matter solid liquid gases, and plasma.

These different states of matter have different characteristics according to which they vary their volume and shape.

Unable to be reduced to a simpler substance, an element is a substance.

An element's fundamental unit is the atom, and a particle is a small piece of matter.

An exclusive state of matter is referred to as a phase.

Thus, an Element is a substance that cannot be broken down into a simpler substance, Atom is the basic unit of an element, a Particle a tiny piece of matter, and a phase is  a unique form of matter in which it can exist

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Answer: Option (C) is the correct answer.

Explanation:

Sodium has atomic number 11 and its electronic distribution is 2, 8, 1. Whereas chlorine has atomic number 17 and its electronic configuration is 2, 8, 7.

Therefore, we can see that sodium has one extra electron and chlorine has deficiency of one electron.

So, in order to complete their octet sodium will give its one valence electron to the chlorine atom. Hence, there is exchange of electrons and thus it will result in the formation of ionic bond.

Thus, we can conclude that in sodium chloride electron movement is related to the bonding as electrons exchange creating ions to form an ionic bond by electrostatic attraction.

Answer:

Its C

Explanation: just had it on usatestprep

Explanation:

An object whose particles are held by strong intermolecular forces of attraction is known as a solid substance.

In solids, particles have least kinetic energy and they can only vibrate at their position.

Therefore, solids have a definite shape and volume.

Hence, when we place a solid object in a container then it is unable to take the shape of container because its molecules are held strongly with each other.

Thus, they bond between its molecules cannot be broken down easily.

ITS D hope this helps

Speed of car A is given as

[tex]v_a = 70 mph[/tex]

now we need to convert it into SI units

1 miles = 1609 m

1 hour = 3600 s

now we have

[tex]v_a = 70 *\frac{1609}{3600} = 31.3 m/s[/tex]

now its distance from Bambi is given as

[tex]d_a = 350 m[/tex]

time taken by it to hit the Bambi

[tex]t = \frac{d}{v}[/tex]

[tex]t = \frac{350}{31.3}[/tex]

[tex]t = 11.2 s[/tex]

Now other car is moving at speed 50 mph

so its speed in SI unit will be

[tex]v_b = 50* \frac{1609}{3600}[/tex]

[tex]v_b = 22.35 m/s[/tex]

now its distance from Bambi is given as

[tex]d_b = 590 feet[/tex]

as we know that 1 feet = 0.3048 m

[tex]d_b = 590*0.3048 = 179.83 m[/tex]

now the time to hit the other car is

[tex]t_2 = \frac{179.83}{22.35}[/tex]

[tex]t_b = 8.05 s[/tex]

So Car B will hit the Bambi first

Answer:

Car b

Explanation:

For the motion of the plane it is given to us that it travel 15.0 km in 15.3 s

So here we can use the formula of average velocity to find it

formula is given as ratio of total displacement and total time

[tex]v = \frac{displacement}{time}[/tex]

here it is given that

[tex]displacement = 15.0 km[/tex]

time = 15.3 s

we need to convert the time into hour as the speed is required in km/h

so we know that

[tex]1 h = 3600 s[/tex]

[tex]t = 15.3 s * \frac{1h}{3600 s}[/tex]

[tex]t = 4.25 * 10^{-3} h[/tex]

now by the above formula

[tex]v = \frac{15.0}{4.25 * 10^{-3}}[/tex]

[tex]v = 3529.4 km/h[/tex]

so the velocity of the plane would be 3529.4 km/h

newtons law states gravity holds things down there fore wigheing you down

Answer:

The greater force will be required to overcome weight.

Explanation:

According to Newton’s second law of motion:

F = W = mg         ………. (i)

Equation (i) shows that with the increase in mass the force or weight in the downward direction will increase. When climber packs too much gear then he has to apply more force in the upward direction to overcome his on weight and luggage. Therefore, it will be difficult for him to reach the summit before a storm blows in. In this way, this scenario is related with Newton’s law.

Given that 0.8 MJ of energy is used in 3.5 minute of time

Now we need to find the power rating

so here power consumed is given by rate of energy which is defined by formula

[tex]Power = \frac{Energy}{time}[/tex]

now we will plug in all given data

[tex]Energy = 0.8 MJ = 8 * 10^5 J[/tex]

[tex]time = 3.5 min = 3.5 * 60 = 210 s[/tex]

now we will find the power

[tex]P = \frac{8 * 10^5}{210}[/tex]

[tex]P = 3809.5 Watt[/tex]

[tex]P = 3.81 kW[/tex]

so it will consume total 3.81 kW power

Final answer:

The power of a blender that uses 0.8MJ in 3.5 minutes is approximately 3.81kW. To find the power rating of an oven, however, additional information would be required.

Explanation:

To calculate the power rating of an oven that uses 0.8 megajoules (MJ) of energy in 3.5 minutes, we would first convert the energy to joules (J), since 1 MJ = 1,000,000 J. Therefore, the energy used is 0.8 MJ * 1,000,000 J/MJ = 800,000 J. After that, we need to convert the time to seconds for consistency since power is typically measured in watts (J/s). There are 60 seconds in a minute, so 3.5 minutes * 60 seconds/minute = 210 seconds.

Now we can calculate the power using the formula: Power (P) = Energy (E) / Time (t). Plugging in our values gives us P = 800,000 J / 210 s = 3,809.52 watts or approximately 3.81 kilowatts (kW). However, since we are looking for the power rating of the oven and not the blender.

When silver is poured into the mould the it will solidify

In this process the phase of the Silver block will change from liquid to solid.

This phase change will lead to release in heat and this heat is known as latent heat of fusion.

The formula to find the latent heat of fusion is given as

[tex]Q = mL[/tex]

here given that

[tex]m = mass = 500 g[/tex]

[tex]L = 111 kJ/kg[/tex]

now we can find the heat released

[tex]Q = 0.5 * 111 kJ[/tex]

[tex]Q = 55.5 kJ[/tex]

So it will release total heat of 55.5 kJ when it will solidify