Can somebody help me?

Can Somebody Help Me?

Answers

Answer 1

The descriptions of the points in the heating curve of water are:

Leg A: solid warms from -40C to OCLeg B: meltingLeg C: Liquid warms from O °C to 100 °CLeg D: EvaporationLeg E: Water vapor warms from 100C

What is a heating curve for a substance?

A heating curve for a substance is a curve which show the phase changes that occur in the substance as the substance is heated over a period of time.

The addition of heat to substances result in an increase in volume and a change of state.

Water can exist in the three physical states of matter, which are solid, liquid, and gas.

A graph showing the changes that occur in water as heat is added to it is referred to as the heating curve of water.

Considering the heating curve of water shown, water exists first as a solid, then liquid, and finally a gas as heat is added to it.

The various descriptions of the point in the heating curve of water are as follows:

Leg A: solid warms from -40C to OC

Leg B: melting

Leg C: Liquid warms from O °C to 100 °C

Leg D: Evaporation

Leg E: Water vapor warms from 100C

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Related Questions

An alternating current runs through a circuit. after a long time, how much charge has passed through the circuit?

Answers

Option C) Infinite charge has passed through the Circuit

How does alternating current work?

Alternating current, also known as AC, is an intermittent electric charge flow.

It might begin at zero, increase to a maximum, decline to zero, turnabout, reach a maximum in the opposite direction, return to the starting value once more, and repeat this cycle indefinitely.

What three alternating current examples can you give?

Both the current we receive from our home power outlets and the current generated by generators or turbines are AC currents. Most electrical appliances, including fans, bulbs, air conditioners, and motors, operate on AC current.

What does the name “alternating current” mean?

In contrast to direct current (DC), which only travels in one direction and cannot sporadically shift, alternating current (AC) is an electric current that periodically reverses direction.

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If a horse weighs 2891 N on earth then what is its mass

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Considering the definition of weight, the mass of the horse is 295 kg.

Definition of mass and weight

Mass is the amount of matter that a body contains and weight is the action exerted by the force of gravity on the body.

The mass of an object will always be the same. Instead, the weight of the object will vary according to the force of gravity acting on it.

Weight is calculated as the product of the object's mass and the value of the gravitational acceleration:

W= m×g

Mass of the horse

In this case, you know:

W= 2891 Ng= 9.8 m/s² gravity of Earth

Replacing in the definition of weight:

2891 N= m× 9.8 m/s²

Solving:

m=2891 N÷ 9.8 m/s²

m= 295 kg

Finally, the mass of the horse is 295 kg.

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Two spaceships are heading toward each other at a mutal speed of 0.999c. both ships shine a laser beam at one another. how will each ship see the other light?

Answers

Both the ships will see the other ship with the same velocity i.e, 0.999c m/s.

To calculate the velocity of one ship as seen by the other ship, we need to use the velocity transformation formula derived from Lorentz transformation:

V = {v1 - v2/1-(v1)(v2)} x c

Here v1 and v2 are the velocities of the two ships

As the ships are heading towards each other v1 = -v2 = 0.999c

Putting this value in the above equation

V = 0.999c + 0.999c/1 - (0.999c)(0.999c) x c = 0.999c m/s

Hence, both the ships will see the other ship with the same velocity i.e, 0.999c m/s.

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If an additional 0.133 molmol of gas is added to the balloon (at the same temperature and pressure), what will its final volume be?

Answers

Its final volume be 1.76 Liters. The term "Final Volume" refers to the amount of Water Allocation (expressed as a whole number of Megaliters) that was determined in line with section 3.3 and was included in an Offer.

What is Avogadro's Law?

An experimental gas law known as Avogadro's law or Avogadro-hypothesis Ampère's connects the volume of a gas to the amount of gas material present. The law is an instance of the ideal gas theory. With the aid of the following formula, one may determine how much more space a gas takes up when its quantity is increased: V1/n1 = V2/n2 (= k, according to Avogadro's law).

Given the following data:

Initial volume = 2.46 LInitial number of moles = 0.158 molFinal number of moles = 0.113 mol

To find the final volume of the gas, we would apply Avogadro's Law:

Avogadro's Law is provided by the formula:

v/n=7

[tex]v_{1} /n_{1}[/tex] = [tex]v_{2} /n_{2}[/tex]

Where:

V is the volume of a gas.n is the number of moles of a gas.

Substituting the given parameters into the formula, we have;

[tex]2.46/0.158=v_{2}/0.113[/tex]

[tex]2.46*0.113=0.158v_{2[/tex]

0.27798=[tex]0.158 v_{2[/tex]

[tex]v_{2[/tex]= 0.27798/0.158

Hence, Final volume = 1.76 Liters.

The complete question is,

A balloon contains 0.158 mol of gas and has a volume of 2.46 l. if an additional 0.113 mol of gas is added to the balloon (at the same temperature and pressure), what is its final volume?

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A particular load is rated to use 2.2 kw at 240 volts. this load is connected to a 2-pole breaker in a panel using 12 awg conductors. how much current will this load draw?

Answers

The current drawn by the load is 9.17 A.

What is current?

Current can be defined as the rate of flow of electric charge round a circuit.

To calculate the current drawn by the load, we use the formula below.

Formula:

I = P/V............................Equation 1

Where:

I = Current drawn by the loadP = Power of the loadV = Voltage

From the question,

Given:

P = 2.2 kW = 2200 WV = 240 V

Susbtitute these values into equation 1

I = 2200/240I = 9.17 A

Hence, the current drawn by the load is 9.17 A.

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The decay rate of a radioactive sample decreases from 175 kbq to 12.4 kbq in 18.3 s.What is the decay constant of this sample?

Answers

By the half-life of radioactive, the decay constant is 0.144 /s.

We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation

N = No(1/2)^(t/t'')

λ = ln2 / t''

where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.

From the question above, we know that

t = 18.3 s

No = 175 kbq

N = 12.4 kbq

Calculate the half-life

N = No(1/2)^(t/t'')

12.4 = 175(1/2)^(18.3/t'')

(1/2)^(18.3/t'') = 62/875

18.3/t'' = ⁰'⁵log(62/875)

18.3/t'' = 3.82

t'' = 4.79 seconds

Determine the decay constant

λ = ln2 / t''

λ = ln2 / 4.79

λ = 0.144 /s

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Consider the cms core measures, and the data used to support their reporting. which do you believe are the easiest to collect and which do you think are the most difficult to collect?

Answers

Through accountability and open disclosure, CMS's core measures lessen the load on providers and enhance patient care in an effective and efficient manner.

What is CMS?

Eligible professionals (EP), critical access hospitals, and eligible hospitals offer healthcare services that are measured and tracked by electronic clinical quality measures (eCQMs), which are produced by a provider's electronic health record (EHR). Reporting and tracking eCQMs enables the health care system to deliver timely, patient-centered, effective, safe, efficient, equitable treatment. Health care providers electronically submit eCQMs, which measure high quality treatment using information from EHRs and other health IT systems.

Health care providers follow up with the eCQMs and needs that the CMS quality programme has identified. Regulatory reporting is an efficient instrument that ensures correct, on-demand reporting by gathering reports and submitting data to CMS in accordance with regulatory requirements. Reduced provider workload and expense due to the CMS metric introduced to NQF. It might be challenging to achieve the patient regulatory criteria for meaningful use (eCQMs) reporting. Its primary metrics don't entirely correspond to requirements for high-quality healthcare.

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A girl of mass 48.0 kg is rescued from a building fire by leaping into a
firefighters' net. The window from which she leapt was 12.0 m above the net.
She lands in the net so that she is brought to a complete stop in 0.45 s. During
this interval (a) What is his change in momentum? (b) What is the impulse on the
net due to the girl? (c) What is the average force on the net due to the girl?
(a) 736.32 kg m s' (UP)
(b) 948 kg m s¹ (DOWN)
(c)2106.7 kg m s'(DOWN)

Answers

(a) The change in momentum of the girl is 736.32 Kg-m/s ( Downwards).

(b) The Impulse in the net is 736.32 Kg-m/s.

(c) The Average force on the net is 1635.86 N.

(a) Let us say, the mass of the girl to be M.

The height of the window is 12m.

When the girl jumps out of the window it becomes a case of free fall so we can apply the equations of motion because downward acceleration as constant. The initial velocity U of the girl is zero.

The final velocity of the girl on reaching the ground is V.

V = √2gH

V = √2x9.8x12

V = √235.2

V = 15.33 m/s.

Now, we know that.

Change in momentum (Δp) = M(V-U)

Δp = 48(15.33-0)

Δp = 736.32 Kg-m/s (Downwards).

(b) The impulse on the net will be equal to the change in momentum of the girl i.e. 736.32 Kg-m/s, because the net was initially at rest and the final velocity of the net is same as that of the girl. Impulse is nothing but change in momentum.

(c) From the Impulse-Momentum theorem, We know that,

Average net force (F) = Δp/Δt

Here change in momentum is 736.32 Kg-m/s.

total change in time is 0.45 seconds.

So, the net average force will be,

F = 736.32/0.45

F = 1635.86 N.

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protons are the subatomic particles that are ..... charged and found in the centre of the atom.
neutrons are the subatomic particles that are ..... charged and found in the centre of the atom.
fill in the blanks

Answers

proton are the subatomic particles that are _positive_ charged and found in the centre of the atom. neutron are the subatomic particles that are _neutral_ charged and found in the centre of the atom .

Quiet inspiration will ________ thoracic and lung volume and ________ intrapulmonary pressure.

Answers

Quiet inspiration will increase thoracic and lung volume and decrease intrapulmonary pressure.

Boyle's Law is the law that determines the relationship of the pressure of a gas with respect to the volume of the container. Here the pressure of gas exists as inversely proportional to the volume of the particular container.

This is one of the major principles which is important for understanding various processes of events occurring during pulmonary ventilation. If there is an increase in the volume of a container takes place, the pressure will gradually decrease.

Quiet inspiration will result in increasing thoracic as well as lung volume and is likely to decrease intrapulmonary pressure. Since the inspiratory muscles get contract to increase the thoracic cavity volume as this will cause an increased volume of the lungs as well. Then gradually there will be an increase in the volume of the lungs that lowers the intrapulmonary pressure which exists below atmospheric pressure.

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A plane traveling north at 200 m/s turns and then travels south at 200 m/s. the change in its velocity is:_________

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A plane traveling north at 200 m/s turns and then travels south at 200 m/s. the change in its velocity is 400 m/s in the south direction.

What is velocity?

A particle or object's movement with respect to time is expressed vectorially as velocity.

The meter per second (m/s), usually referred to as speed, is the accepted unit of velocity magnitude.

As an alternative, the velocity magnitude can be expressed in centimeters per second (cm/s).

The rate of something moving in a specific direction is called its velocity. Using an automobile driving north on a highway as an example, or a rocket after it has launched, as an example of speed.

Scalar implies that the velocity vector's absolute value magnitude will always equal the motion's speed.

ΔV = V1 - V2

ΔV = 200 - (-200)

ΔV = 200+200 = 400 m/s

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The o-h bond energy in water is approximately 467 kj mol^-1. The photon with just enough energy to break one o-h bond has a wavelength (in nm) of?

Answers

The frequency ()of photons to break the O-H bond is 1.1704 ✕ 1015 Hz.

Here, it is given that

The bond energy of O-H per mole=E =467 kJ/mol

Convert the unit of bond energy from kJ to J by using a conversion factor:

1kJ =1000 J

467 kJ/mol = 467 ✕ 103 J /mol

Determine the bond energy for 1 molecule of water (H2O) as:

E = Bond energy per mole / Avogadro’s number (NA)

E = (467 ✕ 103 ) / (6.022 ✕ 1023 )

=  77.55 ✕ 10-20 J

Thereby, the energy required to break 1 molecule of H2O is 77.55 ✕ 10-20 J

Now, determine the frequency in Hz by using a relation:

E=h

Where ‘’ is the frequency of the photon and ‘h’ is the Planck’s constant whose value is 6.626  ✕ 10-34 J/s.

Putting all the values we get,

(77.55 ✕ 10-20 J) = (6.626  ✕ 10-34 J/s) ✕

= (77.55 ✕ 10-20 J) / (6.626  ✕ 10-34 J/s)

= 11.704  ✕ 1014 s-1

= 1.1704 ✕ 1015 s-1

So,  =1.1704 ✕ 1015 Hz

Therefore, the frequency ()of photons to break the O-H bond is 1.1704 ✕ 1015 Hz.

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Which of the forces applied to the block perform nonconservative work on the system?

Answers

The friction force applied to the block performs nonconservative work

on the system.

What is Friction force?

The force preventing sliding against one another of solid surfaces, fluid layers, and material components is known as friction. There are various kinds of friction: Two solid surfaces in contact are opposed to one another's a relative lateral motion by dry friction.Friction between two surfaces causes kinetic energy from moving surfaces to be converted into thermal energy (that is, it converts work to heat). As demonstrated by the use of friction produced by rubbing pieces of wood together to start a fire, this property can have dramatic effects. Every time there is motion with friction, such as when a viscous fluid is stirred, kinetic energy is transformed into thermal energy. Wear is a significant side effect of many types of friction that can result in deteriorated performance or component damage. The discipline of tribology includes friction.

The formula of the friction force F = μN

where,

F = friction force

μ = coefficient of friction

N = normal force

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A caiman swims 190 meters at a speed of 10 m/s. it then enters a stream and slows to 2 m/s for 270 meters. what is the average speed of this cousin of the crocodile? quizlet

Answers

A caiman swims 190 meters at a speed of 10 m/s and it then enters a stream and slows to 2 m/s for 270 meters and then the average speed of this cousin of the crocodile is 2.98 m/s.

What is the speed on average?

The overall distance the object covers in a given amount of time is its average speed.

A scalar value represents the average speed thus it means that it has no direction and is thus by the magnitude.

How are average speeds determined?

The distance travelled is divided by the time taken and it is the formula for calculating average speed.

The alternative formula is to add into the initial and final speeds altogether and divide by two if you have the values.

Give an example of average speed.

The entire distance travelled is then divided by the total time interval to determine the average speed.

d1 = 190m

d2 = 270m

v1 = 10m/s

v2 = 2m/s

average speed = total distance/total time

t1 = 190/10 = 19s

t2 = 270/2 = 135s

so average speed = (190+270)/ (19+135)

= 460/154

=2.98 m/s

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A calculator is found to have a volume of 0.154 liters show using analysis what the volume of the calculator is in gallons?

Answers

The volume of 0.154 liters expressed in gallons is: 0,0406 gallons

To solve this problem the we have to do the conversion of units with the given information.

Information about the problem:

v = 0.154 litersv = expressed in (gallons) =  ?1 gallon = 3.785 liters

By converting the volume units from  (liters) to miles per hour (gallons) we have:

v = 0.154 liters * 1 gallon/3.785 liters

v = 0,0406 gallons

What is unit conversion?

It is the transformation of a value expressed in one unit of measurement into an equivalent value expressed in another unit of measurement of the same nature.

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A 50-kg stunt diver is falling at a speed of 20 m/s. When she is stopped by sinking into a cushion, the cushion exerts an average force of 2500 n on her. Approximately how much time did it take her to stop moving once she hit the cushion?.

Answers

The approximately time that takes to stop the stunt driver once she hit the cushion is: 0.4 s

To solve this exercise, the formulas and procedures to be applied are:

F = m * at = (vf – vi) / a

Where:

m = massF = Forcea = accelerationt= timevf= final velocityvi = initial velocity

Information about the problem:

m = 50 kgvi = 20 m/sF=  -2500 NVf = 0 m/s1 N = kg * m/s²a= ?t =?

Applying the force formula and isolating the acceleration, we get:

F = m * a

a = F/m

a = -2500 N /50kg

a = -2500 kg * m/s² / 50 kg

a = -50 m/s²

Applying the time formula we get:

t = (vf – vi) / a

t = (0 m/s – 20 m/s) / 50 m/s²

t = (– 20 m/s) / -50 m/s²

t = 0.4 s

What is force?

It is the physical magnitude that expresses the effort necessary to move the mass of one kilogram with an acceleration of one meter per second squared, this is expressed in units of the international system in Newton.

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please please help.. Im really strugging.

Answers

A phase change occurs when energy and pressure are added from a system. The phase most often found in nature are solid, liquid, and gas or vapor. Evaporation is the process by which liquid converts into vapor and it is also known as boiling. This happens at the boiling point of a liquid.

What is evaporation?

Evaporation is defined as the process by which liquid or water converts into the form of gas or vapor. A physical property is said to be the characteristic of a substance or compound that has been observed without any the change in the identity of that particular substance. The physical properties are considered as substance's  colour, hardness, density, and melting point as well as boiling points.

Evaporation is the process by which liquid converts into vapor and it is also known as boiling. This happens at the boiling point of a liquid.

Therefore, A phase change occurs when energy and pressure are added from a system. The phase most often found in nature are solid, liquid, and gas or vapor. Evaporation is the process by which liquid converts into vapor and it is also known as boiling. This happens at the boiling point of a liquid.

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What must the charge (sign and magnitude) of a 1.45 gg particle be for it to remain stationary when placed in a downward-directed electric field of magnitude 530 n/cn/c ?

Answers

The charge on the particle must be 2.68 x 10^5 C.

Electric force and Force of gravity

The given mass of the particle, m = 1.45 g = 0.00145 kg

Acceleration due to gravity = 9.8m/s²

Electric field strength, E = 530 N/C

The electric force on the particle is therefore given by;

F = qE, where,

q =charge,

F= force = mg

E is the electric field

For a particle to be stationary this force must be equal to force due to gravity, that is mg force

Hence, qE = mg

q = mg/E.

q = (0.00145 ×9.8)/530

The charge on the particle is, therefore; 2.68 x 10^5 C.

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What is the overall reaction order for the reaction that has the rate law: rate = k[o2] [no ]2?

Answers

 The overall reaction order for the reaction that has the rate law: rate = k[o2] [no ]2 is 3.

The rate law (also known as the rate equation) for a chemical reaction is an expression that provides a relationship between the rate of the reaction and the concentrations of the reactants participating in it.

Now,

The Rate equation is

Rate=  K[A]^m [B]^n

K = Rate constant.

m = order with Respect To A

n =  order with Respect To B.

m +n =  over all order of Reaction

R = K[NO2]^2 [O2]^1

Overall order = 2+1 =3 .

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To verify proper temperature of the refrigerator, dod guidelines requires all vaccine storage devices be visually monitored a minimum of ___________.

Answers

At least twice a day, the storage of vaccines must be checked.

The recommended range for refrigerator temperatures is 2°C to 8°C (36°F to 46°F). All vaccine storage containers must be visually checked at least twice a day to ensure that the temperature is being maintained or verified as appropriate. In order to safeguard people and communities from illnesses that can be prevented by vaccination, proper vaccine storage and handling procedures are crucial. From the time a vaccine is made until it is given out, everyone is accountable for its quality.

Thus, twice a day, the vaccine storage devices must be monitored. 

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What is the symbol, atomic number, # of protons, # of electrons, atomic mass, rounded atomic mass, # of neutrons (show work), and period of: Oxygen, helium, carbon, aluminum, calcium, sodium, potassium, nitrogen, silicon, iron, and hydrogen? Need help soon!

Answers

The atom is the smallest part of a substance that can take part in a chemical reaction.

What is an atom?

The atom is the smallest part of a substance that can take part in a chemical reaction. Let us now address the atoms individually.

Oxygen;

Mass number = 16

Atomic number = 8

Number of protons = 8

Number of electrons - 13

Number of neutrons = 16 -8 = 8

Helium

Mass number = 4

Atomic number = 2

Number of protons = 2

Number of electrons - 13

Number of neutrons = 4 -2 = 2

Carbon

Mass number = 12

Atomic number = 6

Number of protons = 6

Number of electrons - 6

Number of neutrons = 12 - 6 = 6

Aluminum

Mass number = 27

Atomic number = 13

Number of protons = 13

Number of electrons - 13

Number of neutrons =27 - 13 = 14

Calcium

Mass number = 40

Atomic number = 20

Number of protons = 20

Number of electrons - 20

Number of neutrons =40 - 20=20

Sodium

Mass number = 23

Atomic number = 11

Number of protons = 11

Number of electrons - 11

Number of neutrons =23 - 11 = 12

Potassium

Mass number = 39

Atomic number = 19

Number of protons = 19

Number of electrons - 19

Number of neutrons =39 - 19 = 10

Nitrogen

Mass number = 14

Atomic number = 7

Number of protons = 17

Number of electrons - 7

Number of neutrons =14 - 7 = 7

Silicon

Mass number = 28

Atomic number = 14

Number of protons = 14

Number of electrons - 14

Number of neutrons =28 - 14 = 14

Iron

Mass number = 56

Atomic number = 26

Number of protons = 26

Number of electrons - 26

Number of neutrons =56 - 26 = 30

Hydrogen

Mass number = 2

Atomic number = 1

Number of protons = 1

Number of electrons - 1

Number of neutrons =2 - 1 = 1

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1.Write the definition of each term in the definition column. Then decide whether that force produces motion and write either yes, no or it depends in the motion column. 2.For each diagram, determine the net force acting on the object. Follow the format for showing your work shown in (a). Then, write whether or not there will be a change in motion. If yes, write the direction the object will move in.

Answers

Answer:

UN balanced force to applied on that object

A rectangular field in a park is 58.5 ft wide and 114 ft long. what is the area of the field in square meters?

Answers

By unit conversion, the area of rectangular field park is 619.59 m².

We need to know about unit conversion to solve this problem. The unit conversion can be used to convert a unit to another unit. It can be defined as

a = xb

where a is unit a, b is unit b and x is the constant of conversion.

From the question above, we know that

w = 58.5 ft

l = 114 ft

Convert the width and length to meter (1 ft = 0.3048 m)

w = 58.5 ft

w = 58.5 x 0.3048 m

w = 17.83 m

l = 114 ft

l = 114 x 0.3048 m

l = 34.75 m

Find the area

A = w x l

A = 17.83 x 34.75

A = 619.59 m²

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By measuring the length of the skid marks, an accident investigator determines that the distance a car travelled between the brakes being applied and stopping was 22 m.

The investigator used a sled to determine the friction. The investigator then calculated that the car decelerated at 7.2 m / s2.
Calculate the speed of the car just before the brakes were applied.

Please help, i’m so confused!!

Answers

The initial velocity of the car just before the brakes were applied is 17.80 m/s

Given parameters

From the question given above, the following data were obtained:

Distance (s) = 22 mDeceleration (a) = -7.2 m/s²Final velocity (v) = 0 m/sInitial velocity (u) = ?

How to determine the initial velocity of the car

The initial velocity of the car can be obtained as illustrated below:

v² = u² + 2as

0² = u² + (2 × -7.2 × 22)

0 = u² + (-316.8)

0 = u² - 316.8

Collect like terms

u² = 0 + 316.8

u² = 316.8

Take the square root of both side

u = √316.8

u = 17.80 m/s

Thus, we can conclude that the initial velocity of the car before the brakes were applied is 17.80 m/s

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A photon of wavelength 200. nm strikes a metal and ejects an electron with a velocity of 3.4 x 105 m/s. what is the threshold frequency of the metal?

Answers

According to photoelectric effect, the threshold frequency of metal is 1.42 x 10¹⁵ Hz.

We need to know about the photoelectric effect to solve this problem. The photoelectric effect is electron ejected from metal because of light source. The kinetic energy of the ejected electron is

K = h(f - fo)

where K is kinetic energy, h is Max Planck constant (6.6 x 10¯³⁴ Js), f is the frequency of light source and fo is the threshold frequency of the metal.

From the question above, we know that

λ = 200 nm = 200 x 10¯⁹ m

v = 3.4 x 10⁵ m/s

me = 9.1 × 10¯³¹ kg

Find the frequency of light source

f = c / λ

f = 3 x 10⁸ / (200 x 10¯⁹)

f = 1.5 x 10¹⁵ Hz

Find the threshold frequency

K = h(f - fo)

1/2 . me .v² = 6.6 x 10¯³⁴ (1.5 x 10¹⁵ - fo)

1/2 . 9.1 × 10¯³¹ . (3.4 x 10⁵)² = 9.9 x 10¯¹⁹ - 6.6 x 10¯³⁴fo

9.9 x 10¯¹⁹ - 6.6 x 10¯³⁴fo = 5.26 x 10¯²⁰

6.6 x 10¯³⁴fo = 9.37 x 10¯¹⁹

fo = 1.42 x 10¹⁵ Hz

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Anyone in AP physics, I'm a freshman and need a bit of help understanding this problem

Answers

-4.5km/hr 2.25km/hr 9.0km/hr

A 30 gram string is under 30 newtons of tension. a pulse travels the length of the string in 100 milliseconds. how long is the string?

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The length of the string is 100 m.

Mass of the string = 30 gm = 0.003 kg

Tension on the string = 30 N

Time = 100 ms = 0.1 s

The wave speed of the string is,

[tex]Wave \: speed = \frac{ Tension \: force}{ Linear \: density}[/tex]

[tex]v = \sqrt{ \frac{T}{μ } } [/tex]

[tex]v = \sqrt{ \frac{TL}{m } } [/tex]

The velocity of the string is,

[tex]V = \frac{L}{t} [/tex]

The length of the string is,

[tex] \frac{L}{t} =\sqrt{ \frac{T}{μ } } [/tex]

[tex]L = \frac{T \times t ^{2} }{m } [/tex]

[tex]L = \frac{30 \times (0.1) ^{2} }{0.003} [/tex]

L = 100 m.

Therefore, the length of the string is 100 m.

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if your parents slam the brakes while they are driving at 22.0 M/S for 2.0 seconds and your new velocity is 14 M/S what acceleration did you experience?

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The acceleration experienced is  -4 m/s.

Acceleration is the rate of change of an object's velocity with respect to time. Acceleration is a vector quantity. The direction of an object's acceleration is given by the direction of the net force acting on that object. Acceleration is the name we give to the process of changing velocity. Velocity is both speed and direction, so there are only two ways to accelerate.

Velocity is the rate of change of displacement. Acceleration is the rate of change of velocity. Velocity is a vector quantity because it consists of both magnitude and direction. Since acceleration is the rate of change of velocity, it is also a vector quantity.

initial velocity =   22.0 M/S

final velocity = 14 m/s

time to change the velocity = 2 second

v = u + at

at = u - v

a= - [tex]\frac{u - v}{t}[/tex]

a = - [tex]\frac{22 -14}{2}[/tex]

a = -8/2

a = -4 m/s

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The mass spectrum of an amine shows a parent peak with an odd mass for the molecular ion. what does this tell you about the amine?

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The amine contains an odd number of N atom because the mass spectrum of an amine shows a parent peak with an odd mass for the molecular ion.

The m/z ratios of the ions contained in a sample displayed against their intensities form a mass spectrum. The mass spectra of amines are dominated by alpha-cleavage, which results in an alkyl radical on a resonance stabilized nitrogen containing cation.

Each peak in a mass spectrum shows a component of unique m/z in the sample, and heights of the peaks denote the relative abundance of the various components in the sample. Multiple alpha-cleavages are possible for secondary and tertiary amines.

Therefore, the  amine contains an odd number of N atom because the mass spectrum of an amine shows a parent peak with an odd mass for the molecular ion.

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What is the dominant intermolecular force that determines the solubility of the amine hydrochloride salt of ethyl 4-aminobenzoate in water?

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Amine hydrochloride salt of ethyl amino benzoate will be ionic in nature

water is polar in nature so ion-dipole Will be dominant intermolecular force what is intermolecular force?The forces that draw atoms, molecules, and ions together when they are positioned near to one another are referred to as "Intermolecular forces."This differs from Intramolecular forces, similar term for the covalent bonds that exist inside molecules.A positive (+) charge on one particle is drawn to a negative (-) charge on the other particle when two particles interact through an intermolecular interaction.Atoms, molecules, or ions are strongly attracted to one another and move toward one another when intermolecular interactions are high. These are more frequently encountered in states that are condensed, like liquid or solid.Atoms, molecules, or ions do not have a significant attraction to one another and move widely apart when intermolecular interactions are weak.

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The correct question is:

What is the dominant intermolecular force that determines the solubility of the amine hydrochloride salt of ethyl 4-aminobenzoate in water?

a)ion-ion

b)ion-dipole

c)London dispersion

d)hydrogen bonding

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