The function h(t) = –16t2 + 96t + 6 represents an object projected into the air from a cannon. The maximum height reached by the object is 150 feet. After how many seconds does the object reach its maximum height? 2 seconds 3 seconds 6 seconds 9 seconds

Answer:

0.625 (62.5 %)

Explanation:

The production efficiency is equal to the rate between the energy converted into useful energy and the energy in input:

[tex]\eta = \frac{E_{useful}}{E_{in}}[/tex]

where in this case:

- the useful energy is 750 J (the energy used in cellular respiration)

- the energy in input is 1200 J (the energy taken by eating the seeds)

Substituting,

[tex]\eta = \frac{750 J}{1200 J}=0.625[/tex]

Which means an approximate efficiency of 62.5 %.

1)

1. B

2. H

3. C

4. A

5. F

6. D

7. E

8. G

2) Perpendicular

3) Parallel

Make sure you study this

I'm up to modern physics this was a nice review for me

Answer:

The SI unit for pressure is Pascal (Pa) I believe :)

Mark brainliest if correct please!

Answer:

the answer is B

Explanation:

wave x has the highest hertz making it the answer

Answer:

Electric and magnetic field waves are oriented at 90 degree angles relative to each other.

Explanation:

The oxidation number is equal to the charge on the ion.N2 is the divalent ion so the charge on N2 is zero as both the nitrogen atom share same number of electron and have same electronegativity. The dipole moment of N2 is zero.Therefore the cxidation number of N2 is 0.

Answer:

the cxidation number of N2 is 0

Explanation:

Answer:

A transformer.

Explanation:

A transformer is a device that involves magnetically coupled coils isolated from one to another but wound on the same magnetic core. A variable current in time in a coil establishes in the magnetic core a flux also variable in time, this flow is linked to the other coil and induces in it an electromotive force (voltage) variable in time.

Answer: C. a transformer.

For USATestprep.

Answer:

1.25 focal lengths

Explanation:

The lens equation states that:

[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]

where

f is the focal length

p is the object distance

q is the image distance

In this problem, the image is 4 times as far from the lens as is the object: this means that

[tex]q=4p[/tex]

If we substitute this into the lens equation and we rearrange it, we get

[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{4p}=\frac{4+1}{4p}=\frac{5}{4p}\\p=\frac{5}{4}f=1.25 f[/tex]

so, the object distance measured in focal lengths is

1.25 focal lenghts

Answer:

[tex]1.0313\cdot 10^{12}[/tex]

Explanation:

The net charge is given by the sum of the charges of the protons and of the electrons:

[tex]Q=N_p q_p + N_e q_e[/tex]

where we have

[tex]Q=-5.00 nC=-5.00\cdot 10^{-9}C[/tex] is the net charge

[tex]N_p = 1.0\cdot 10^{12}[/tex] is the number of protons

[tex]q_p = +1.6\cdot 10^{-19}C[/tex] is the charge of one proton

[tex]N_e[/tex] is the number of electrons

[tex]q_e = -1.6\cdot 10^{-19}C[/tex] is the charge of one electron

Solving the equation for [tex]N_e[/tex], we find the number of electrons:

[tex]N_e = \frac{Q-N_p q_p}{q_e}=\frac{-5.0\cdot 10^{-9}C-(1.0\cdot 10^{12})(1.6\cdot 10^{-19}C)}{-1.6\cdot 10^{-19}C}=1.0313\cdot 10^{12}[/tex]

The speck of dust has 1.0312 x 10¹² electrons. This was calculated by first finding the number of extra electrons required to achieve the negative charge, and then adding this to the original number of protons.

Given the net charge of the speck of dust is −5.00 nc or -5.00 × 10^-9 Coulombs, and we are provided with a 1.0000×10¹² protons in it. Given that we know the fundamental charge e is equal to +1.602 x 10-¹⁹ C for a proton and -1.602 x 10-¹⁹ C for an electron respectively.

Since protons are positively charged and electrons are negatively charged, the charge of an atom or in this case, a speck of dust, is determined by the number of protons and electrons. Considering the charge of one electron, to find the number of electrons, we can use the following formula:

nr of electrons = net charge/charge of one electron

Just plug the values into the formula and solve:

nr of electrons = -5.00 × 10⁻⁹ C /  -1.602 × 10⁻¹⁹ C/e⁻ = 3.12×10¹⁰ electrons

However, we started with 1.0000 × 10¹² protons, therefore, to gain a negative charge, the speck of dust must have more electrons than protons:

Total electrons = nr of protons + nr of extra electrons .

This gives us:  = 1.0000 × 10¹² protons + 3.12×10¹⁰ electrons = 1.0312 x 10¹² electrons.

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Answer:

0.0129 V

Explanation:

The magnitude of the induced emf in the circuit is given by:

[tex]\epsilon = \frac{\Delta \Phi}{\Delta t}[/tex]

where

[tex]\Delta \Phi[/tex] is the change in magnetic flux through the coil

[tex]\Delta t[/tex] is the time interval

To find the change in magnetic flux, we need to find the initial flux and the final flux.

The area of the coil is

[tex]A=\pi r^2 = \pi (0.35 m)^2=0.385 m^2[/tex]

The initial magnetic field is

[tex]B_i = 0.50 T[/tex]

so the initial flux is

[tex]\Phi_i = B_i A = (0.50 T)(0.385 m^2)=0.193 Wb[/tex]

While the final flux is zero, since the coil is completely out of the magnetic field:

[tex]\Phi_f = 0[/tex]

so the magnitude of the change in flux is

[tex]\Delta \Phi = |\Phi_f - \Phi_i|=|0-0.193 Wb|=0.193 Wb[/tex]

While the time interval is

[tex]\Delta t = 15 s[/tex]

so the induced emf is

[tex]\epsilon = \frac{0.193 Wb}{15 s}=0.0129 V[/tex]

Final answer:

The force constant of the pogo-stick spring is 3266.67 N/m.

Explanation:

The force constant of a spring can be found using Hooke's Law, which states that the force exerted by a spring is directly proportional to its displacement. The formula to calculate the force constant is: k = F / x, where k is the force constant, F is the force exerted by the spring, and x is the displacement of the spring. In this case, the force exerted by the spring is the weight of the girl standing on the pogo stick, which can be calculated using the formula:

F = mg, where m is the mass of the girl and g is the acceleration due to gravity.

Plugging in the values:
F = (40 kg) * (9.8 m/s²) = 392 N

Substituting the values into the formula for the force constant:
k = (392 N) / (0.12 m) = 3266.67 N/m

Red I believe ????????????????????????

As metal heats, the color gets lighter, so it would start off as red, then change to orange, then yellow then white.

Red is the colder color.

Answer:

electromagnetic waves. (D)

Explanation:

I got it right on the test.

also the lines are electromagnetic waves (if that makes since)

hope this helps! :)

The car traveled at an average speed of 20 mi/h. Option C

The car will travel at an average speed of 20 mi/h, this is so,  because the average speed is calculated as the total distance traveled divided by the total time taken.

In this case, the car traveled a distance of 8 miles in 24 minutes (which is equivalent to 0.4 hours), so the average speed is 8 miles / 0.4 hours = 20 mi/h.

Options A and B mention acceleration, but there is no information provided to calculate acceleration in this scenario.

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Answer:

D. near an ocean coastline

Explanation:

The magnetic needle of a compass can be deviated by the magnetic field that the ocean has, this is important to remember because eventhough it´s not a big difference but it is significant enough to keep it in mind. Ocean can attract the magnetic needle of the compass and create a deviation on it.

The electric current is the electric charge flow that travels through a material, which can be:

Solid (movement of electrons)

Liquid (movement of ions)

Gas (movement of ions or electrons)

Although in general, the movement of charges is taken as electrons.

In this sense, for electric current to exist, the electrons furthest from the nucleus of the atom of a material, will have to detach and circulate freely between the atoms of the body. Being the unit of this flow of current according to the International System of Units the Ampere (A).

a) Zinc (work function: 4.3 eV)

The equation for the photoelectric effect is:

[tex]E=\phi + K[/tex] (1)

where

[tex]E=\frac{hc}{\lambda}[/tex] is the energy of the incident photon, with

h = Planck constant

c = speed of light

[tex]\lambda[/tex] = wavelength

[tex]\phi[/tex] = work function of the metal

K = maximum kinetic energy of the photoelectrons emitted

The stopping potential (V) is the potential needed to stop the photoelectrons with maximum kinetic energy: so, the corresponding electric potential energy must be equal to the maximum kinetic energy,

[tex]eV=K[/tex]

So we can rewrite (1) as

[tex]E=\phi + eV[/tex]

where we have:

[tex]\lambda=200 nm = 2\cdot 10^{-7} m[/tex]

V = 1.93 V

e is the electron charge

First of all, let's find the energy of the incident photon:

[tex]E=\frac{hc}{\lambda}=\frac{(6.63\cdot 10^{-34}Js)(3\cdot 10^8 m/s)}{2\cdot 10^{-7}m}=9.95\cdot 10^{-19} J[/tex]

Converting into electronvolts,

[tex]E=\frac{9.95\cdot 10^{-19}J}{1.6\cdot 10^{-19} J/eV}=6.22 eV[/tex]

And now we can solve eq.(1) to find the work function of the metal:

[tex]\phi = E-eV=6.22 eV-1.93 eV=4.29 eV[/tex]

so, the metal is most likely zinc, which has a work function of 4.3 eV.

b) The stopping potential is still 1.93 V

Explanation:

The intensity of the incident light is proportional to the number of photons hitting the surface of the metal. However, the energy of the photons depends only on their frequency, so it does not depend on the intensity of the light. This means that the term E in eq.(1) does not change.

Moreover, the work function of the metal is also constant, since it depends only on the properties of the material: so [tex]\phi[/tex] is also constant in the equation. As a result, the term (eV) must also be constant, and therefore V, the stopping potential, is constant as well.

Answer:

It would be a neutralization reaction if i do believe so

Explanation:

A Acid and an Base Neutralize each other you have something too acidic you use a base to neutralize it and same goes for if it is too basic meaning you would use an acid to neutralize it.

Hope it helps =)

Answer: C) neutralization

Explanation:-

B. Ionization is a process in which the most loosely bound electron is removed from an isolated gaseous atom.

[tex]M\rightarrow M^++e^-[/tex]

C. Neutralization is a special type of double replacement reaction in which acid and base combines to form salt and water.

[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]

D. Redox is a chemical reaction in which oxidation and reduction tales place simultaneously.

[tex]M+N^+\rightarrow M^++N[/tex]

Answer:

= 1.0 Ω

Explanation:

Total resistance of resistors is calculated by adding the resistance of each resistor.

In this case, one resistor is 9.0Ω and lets assume the other has R Ω

Therefore; Total resistance is = (9 + R) Ω

From the Ohm's law; R = V/I

Thus;

(9 + R) = 6.0/0.60

9 + R = 10

R = 1 Ω

Therefore, the resistance of the unknown resistor is 1.0 Ω

Answer:

To your left

Explanation:

The direction of the force exerted on charged particle due to a magnetic field is given by the right-hand-rule, where:

- The index finger indicates the direction of motion of the electron

- the middle finger gives the direction of the magnetic field

- the thumb gives the direction of the force if the particle is positively charged - otherwise, the direction is reversed

in this case, we have an electron (so, a negatively charged particle):

- The direction of motion (index finger) is horizontal, toward you

- The electron begins to curve upward as it enters the field, so this means that the force exerted on the electrons is upward --> the thumb must point downward (because the electron is negatively charged)

- The index finger gives us the direction of the magnetic field: therefore, to your left.

Answer:

= 2

Explanation:

During nuclear fusion, two lighter nuclei of elements combine to form heavy nucleus and also energy is released;

During the process of hydrogen fusion a nucleus of deuterium is formed from two protons with emission of a neutrino.

In this case deuterium fuses with hydrogen nuclei to form helium-3 and also release energy.

That is;

2/1 H + 1/1 H = 3/1 He + energy

Answer:

Average emf in the coil: 0.0672 V.

Explanation:

Convert all units to standard SI units.

Consider Faraday's Law of Induction:

[tex]\displaystyle \begin{aligned}\epsilon &= \text{Rate of change in}\;(N\cdot \phi)\\&=\text{Rate of change in}\; (N \cdot (B\cdot A\cdot \cos{\theta}))\end{aligned}[/tex]

where

The coil is circular with a radius of [tex]2.41\times 10^{-2}\;\text{m}[/tex]. As a result,

[tex]A = \pi\cdot r^{2} = \pi\times (2.41\times 10^{-2})^{2} = 1.82467\times 10^{-3}\;\text{m}^{2}[/tex].

Neither [tex]N[/tex] nor [tex]A[/tex] changes in this 0.115 seconds. As a result, the average rate of change in [tex]N\cdot B\cdot A[/tex] is the same as [tex]N\cdot A[/tex] times the average rate of change in [tex]B[/tex].

[tex]\displaystyle \begin{aligned}\text{Average}\;\epsilon &= \text{Average Rate of Change in}\; (N\cdot (B\cdot A\cdot \cos{\theta}))\\&=\text{Average Rate of Change in}\; (N\cdot B\cdot A) \\&= (N\cdot A)\cdot \text{Average Rate of Change in}\;B\\&= 107\times 1.82467\times 10^{-3}\times \frac{91.7\times 10^{-3}- 52.1\times 10^{-3}}{0.115}\\ &=0.0672\;\text{V}\end{aligned}[/tex].

All numbers in the question come with three sig. fig. Keep more sig. fig. than that in the calculation but round the final answer to three sig. fig.

The magnitude of the average emf, in millivolts, which is induced in the coil during this time interval is approximately 37.93 mV.

To find the magnitude of the average emf induced in a coil when the magnetic field strength changes, we use Faraday's law of electromagnetic induction. The formula given is:

EMF = N x (\(∆B/\u2206t\)) x A

Where:

First, calculate the area of the coil:

A = \(\pi r² \) = \(\pi \times (0.0241)²\) = \(\pi \times 0.00058081 m²\)

Then, calculating the EMF:
EMF = 107 x (39.6 \times 10⁻³ T / 0.115 s) x (\(\pi \times 0.00058081 m²\))

Upon calculation, you find that the average induced emf is approximately 37.93 millivolts (mV).

Answer :D

Some characteristics shared by all electromagnetic waves are that they all travel at the same speed of light and their own transmission does not need medium. These wave types can also travel through empty spaces

It is D.They have the same speed

Passengers on the train, and flies on the passengers, can be sleeping or reading books. In their reference frames, the train is not moving.

Explanation:

1D motion is motion in only one direction.  To put it simply, it's motion along a line.  For example, a train on a straight track has 1D motion.

2D motion is motion in two directions.  A good example of this is a projectile launched at an angle.  It has both vertical motion and horizontal motion.

One dimensional motion is restricted to just a line. Thing about an object that can only travel on the x-axis. It's displacement, velocity and acceleration can be defined by just single numbers. The sign of that number can indicate the direction since there are only two directions.

On the other hand, two dimensional motion can happen on a plane. Think about an object that can travel anywhere on a Cartesian plane (normal graphing paper with x-axis and y-axis). This object's displacement, velocity and acceleration need to defined by two numbers and is done so usually in vectors. For example the position can be (3, 5).

Answer:

pleading

Explanation:

the first step in a lawsuit where parties pass their claims and their defenses. the plaintiff or the one complaining states the issue while the defendant states his answer on the complain and his defense

Final answer:

The process of bringing a complaint and filing an answer in a civil lawsuit is known as the pleadings. Option c.

Explanation:

The process of bringing a complaint and filing an answer is known as the pleadings. In a civil lawsuit, pleadings are the formal documents filed with the court that outline the parties' respective legal positions. The plaintiff initiates this process by filing a complaint, alleging harm or injury, and the defendant responds with an answer, setting forth the grounds for defense. This stage is crucial for setting the case in motion and establishing the issues that will be addressed during the trial or settlement proceedings.

Answer:

The force on the faster cart is 3 times the force on the slower cart

Explanation:

The relationship between force exerted on each cart (F), mass of the cart (m) and acceleration (a) is given by Newton's second law:

[tex]F=ma[/tex]

For cart A, we have

[tex]F_A = m a_A[/tex] (1)

For cart B, we have

[tex]F_B = m a_B[/tex] (2)

the problem says that the acceleration of one cart is 3 times the acceleration of the other one, so

[tex]a_B = 3 a_A[/tex]

Substituting into eq.(2):

[tex]F_B = m(3 a_A)=3 (m a_A)[/tex]

So, if we divide (2) by (1), we find the ratio between the two forces:

[tex]\frac{F_B}{F_A}=3[/tex]

so, the force on cart B is 3 times larger the force on cart A.

GFCI outlets are found in wet areas is the true statement about a GFCI oulet

Answer: Option D.

Explanation:

            GFCI stands for Ground Fault Circuit Interrupter and also named as RCD (Residual Current Device). This is a kind of circuit breaker that cuts off electricity after detecting an imbalance between output and input currents. The switch protects household lines and sockets against overheating and possible fire.  

              GFCI protects the people and is mostly used in bathrooms or kitchen where electrical equipment is used. Also, it is available where the human body can get into contact with the floor or metal fixings that provide an alternative route to power in the event of a fault. These outlets are available in two versions: the circuit breaker installed in the control panel and receptacle type installed into the electrical box.

Answer:

It would not be possible the cohesion among water molecules by the polar covalent bonding.

Well, to understand this in a better way, let's begin by explaining that water is special due to its properties, which makes this fluid useful for many purposes and for the existence of life.

In this sense, one of the main properties of water is cohesion (molecular cohesion), which is the attraction of molecules to others of the same type. So, water molecule ([tex]H_{2}O[/tex]) has 2 hydrogen atoms attached to 1 oxygen atom and can  stick to itself through hydrogen bonds.

How is this possible?

By the polar covalent bonding, a process in which electrons are shared unequally between atoms, due to the unequal distribution of electrons between atoms of different elements. In other words: slightly positive and slightly negative charges appear in different parts of the molecule.  

Now, it can be said that a water molecule has a negative side (oxygen) and a positive side (hydrogen).  This is how the oxygen atom tends to monopolize more electrons and keeps them away from hydrogen. Thanks to this polarity, water molecules can stick together.

If water molecules did not have a slight negative charge on one end and a slight positive charge on the other, several important properties of water would be affected. These properties include the ability of water to form hydrogen bonds, its high boiling point, high surface tension, and its ability to dissolve substances. The polar nature of water molecules is essential for many of the unique properties and functions of water in biological systems and the environment.

If water molecules did not have a slight negative charge on one end and a slight positive charge on the other, several important properties of water would be affected. One of these properties is the ability of water molecules to form hydrogen bonds with each other. These hydrogen bonds allow water to have a high boiling point, high surface tension, and the ability to dissolve many substances. Without the polar nature of water molecules, these properties would be significantly altered.

For example, if water molecules were not polar, they would not be able to form hydrogen bonds, which are responsible for water's high boiling point. This means that water would evaporate more easily and at lower temperatures, making it difficult for organisms to survive in aquatic environments. Additionally, water's ability to dissolve other substances, such as salts and nutrients, would be reduced or eliminated altogether.

Answer: A changing magnetic flux establishes a current in a circuit.

Faraday's Law of Electromagnetic Induction was formulated from the experiments made by him and states that:  

The voltage induced in a closed circuit is directly proportional to the speed with which the magnetic flux that crosses any surface with the circuit as edge changes in time

[tex]\oint\limits_C {\vec{E}}\,d\vec{l}=-\frac{d}{dt} \int\limits_S {\vec{B}} \, d\vec{A}[/tex]

where:  

[tex]\vec{E}[/tex] is the Electric Field  

[tex]d\vec{l}[/tex] is the infinitesimal element of the C contour

[tex]\vec{B}[/tex] is the magnetic field density

[tex]S[/tex] is an arbitrary surface, whose edge is C  

The negative sign indicates the direction of the induced current and refers to the opposition between the fields induced by the magnetic flux and the electromotive force.  

So, it is the change in the magnetic flux that establishes a voltage in the circuit, hence current.