Biologists measure the total current due to potassium ions moving through a cell membrane of a rock crab neuron cell as 27 nA .

How many ions pass through the membrane each second?

We are given –

As we know –

↠K.E = 1/2 mv ²

↠ 15.6 = 1/2 × 5.5 × v ²

↠15.6 = 2.75 v ²

↠2.75v ² =15.6

↠v ² = 5.67

↠v=√5.67

↠v = 2.381 m/s

The ball rebound speed on its first bounce will be 4.79 m/s.

It should be noted that based on the information given the launch angle will be:

= 70° - 20°

= 50°

Therefore, vy/vx = tan 50

vx = vy/tan 50 = 3/t

-1.09 = vy + 0.5gt²

= 3tan50 + 4.9t²

0.95 = t²

t = ✓0.95

t = 0.97.

vx = 3/0.97

vx = 3.06m/s

vy = 3.68m/s

Therefore, the speed will be:

= ✓(3.06)² + (3.68)²

= 4.79m/s

Complete question:

A rubber ball is dropped onto a ramp that is tilted at 20° as shown in the figure(Figure 1) . A bouncing ball obeys the "law of reflection," which says that the ball leaves the surface at the same angle it approached the surface. The ball's next bounce is 3.0 m to the right of its first bounce. What is the ball rebound speed on its first bounce?

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Because it's so much closer to us than any other star.

Answer:

17

Explanation:

answer is 16.6666 which is equal to 17

Answer: c)• 2/3

Explanation:

Lets say q1 and q2 are two charges with r distance far apart.

So electrostatic force

F = (k q1 q2) / r²

as k = Coulomb's constant

Now

q1' = 2q1

q2' = q2/3

Therefore the new electrostatic force

F' = (k q'1 q'2) / r²

F' = (k 2q1 q2) / 3r²

F' = 2/3 [(k q1 q2) / r²]

so F' = 2/3F

New electrostatic force  is 2/3F

The expression that represents the new electrostatic force between the two charges if one charge doubles and the other one is divided by three is;

Option C; F_new = ²/₃F

Formula for electrostatic force is;

F = kq₁q₂/r²

where;

k = Coulomb's constant

q₁ = first charge

q₂ = second charge

r = distance between charges

Now, we are told that one charge doubles and the other one is divided by three. Thus, the new charges are now;

2q₁ and q₂/3

Thus;

F_new = k(2q₁ × q₂/3) / r²

F_new = ²/₃kq₁q₂/r²

F_new in terms of F is;

F_new = ²/₃F

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All the equations of motion are as follows, Displacement (s) equation, Final velocity (v) equation, Average velocity (v_avg) equation, Displacement (s) equation with average velocity, and Displacement (s) equation.

In terms of its motion as a function of time, equations of motion define how a physical system behaves. In more detail, the equations of motion define how a physical system behaves as a collection of mathematical functions expressed in terms of dynamic variables.

In conclusion, equations of motion define how a physical system behaves in terms of how its motion changes over time.

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The wavelengths are given as

firsts harmonic = 40 m

second harmonic = 20 m  

third harmonic = 13.33 m

Wavelength refers to the distance between two consecutive points of a wave that are in phase, or the distance it takes for a wave to complete one full cycle. It is commonly denoted by the Greek letter lambda (λ).

Using the wavelength of the fourth harmonics as reference, we have that the full scale is 20 m

firsts harmonic = 40 m (double of the full scale)

second harmonic = 20 m (covers the full scale)

third harmonic = 20 m * 2/3 = 13.33 m (covers 2/3 of the full scale)

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Given data:

* The final velocity of the ball is 0m/s.

* The acceleration of the ball is,

* The time taken by the ball is 8 s.

Solution:

By the kinematics equation, the initial velocity of the ball in terms of the final velocity, acceleration, and the time taken is,

where v is the final velocity, u is the initial velocity, a is the acceleration and t is the time taken,

Substituting the known values,

Thus, the initial velocity of the ball is 3.2 m/s.

Hence, option D is the correct answer.

By observing the graph we get : hot above 21 going towards 21, cold below 21 going towards 21

Examine your data.

If necessary, compute an average for each of your experiment's trials.

Be sure to give each table and graph a clear label.

Put the dependent variable on the y-axis and the independent variable on the graph's x-axis.

Graphs present information to you as a picture or visual representation. This knowledge is referred to as "data." When you put data into a picture, it can appear lean or bulky, lengthy or short. In other words, there are occasions when we have a ton of data, which calls for numerous graphs.

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The much more likely temperature change for each cups from 0 min - 40 min is shown by warm above 21 heading towards 21 and chilly below 21 going near 21.

The temperature of the system serves as a proxy for its overall kinetic energy. The temperature of a system rises as the kinetic energy of the system begins to rise as even the particle's velocity rises. Heat is the term used to describe the energy that is transmitted between two components with different temperatures.

The temperatures of an element is the most accurate analog for something akin to the angular momentum of a particle. The average energy of an object's constituent particles can be calculated along with its temperature. As the temperature increases, the molecules travel more rapidly.

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The net force on the airplane window of area 1800 cm² is 3469.47 Pa.m² .

Given:

Pressure inside the cabin: 0.95 atm

Pressure outside the cabin: 0.76 atm

Area of the airplane window: 1800 cm²

Now to find the net force on the airplane window, we can calculate the pressure difference between the inside and outside of the cabin and to calculate the pressure difference, we subtract the outside pressure from the inside pressure.

Pressure Difference = Pressure inside - Pressure outside

Pressure Difference = 0.95 atm - 0.76 atm

Pressure Difference = 0.19 atm

The area of the airplane window is given as 1800 cm². To simplify calculations in SI unit we convert the area to square meters:

Area in m² = (Area in cm²) / 10,000

Area in m² = 1800 cm² / 10,000

Area in m² = 0.18 m²

As we know,

Net Force = Pressure Difference * Area

Net Force = 0.19 atm * 0.18 m²

Net Force = 0.0342 atm·m²

To convert the net force to pascals (Pa), we use 1 atm = 101325 Pa. Multiplying the net force by 101325 Pa, we get

Net Force = 3469.47 Pa·m²

Therefore, the net force on the airplane window is approximately 3469.47 pascals times square meters (Pa.m²).

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(1) The distance of the image formed by the lens is determined as 6 cm.

(2) The image formed is real.

The distance of the image formed by the lens is calculated by applying the following formula as follows;

1/f = 1/v + 1/u

where;

The distance of the image formed by the lens is calculated as;

1/v = 1/f - 1/u

1/v = 1/2 - 1/3

1/v = 1/6

v = 6 cm

Since the sign of the image of the image is positive, the image formed is real.

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Answer:

D.velocity

Explanation:

When unbalanced forces are applied to a moving bike along the direction its moving, the velocity of the bike changes.

Unbalanced forces causes a body to accelerate. Acceleration is the rate of change of velocity with time.

When unbalanced forces acts on a body, the velocity changes.

Answer:

Hello! Your answer would be, A) True

Explanation:

Hope I helped! Ask me anything if you have any questions. Brainiest plz!♥ Hope you make a 100%. Have a nice morning! -Amelia♥

83.2% of the original 14Carbon atoms present in the wooden framing of the ancient building at the time of its construction are still present today.

The half-life of Carbon-14 (14C) is 5,730 years, which means that after this time, half of the 14C atoms in a sample will have decayed. Using this information, we can estimate the proportion of remaining 14C atoms in the wooden framing of an ancient building that was constructed 3,000 years ago.

Since 3,000 years have passed, we can calculate the number of half-lives that have occurred by dividing the time elapsed (3,000 years) by the half-life of 14C (5,730 years). In this case, approximately 0.524 half-lives have occurred (3,000 / 5,730 ≈ 0.524).

With each half-life, the number of 14C atoms is halved. Therefore, after 0.524 half-lives, the proportion of remaining 14C atoms in the wooden framing can be estimated to be approximately \(0.5^{0.524}\), which is about 0.832 or 83.2%. The rest have decayed over time. It is worth noting that this estimation assumes a constant rate of decay and no additional 14C uptake or loss since the construction of the building.

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Answer:

t = 300.3 seconds

Explanation:

Given that,

The mass of a freight train, \(m=1.01\times 10^7\ kg\)

Force applied on the tracks, \(F=7.5\times 10^5\ N\)

Initial speed, u = 0

Final speed, v = 80 km/h = 22.3 m/s

We need to find the time taken by it to increase the speed of the train from rest.

The force acting on it is given by :

F = ma

or

\(F=\dfrac{m(v-u)}{t}\\\\t=\dfrac{m(v-u)}{F}\\\\t=\dfrac{1.01\times 10^7\times (22.3-0)}{7.5\times 10^5}\\\\t=300.3\ s\)

So, the required time is 300.3 seconds.

Answer:

No

Explanation:

Answer:

1

Explanation:

Answer: the answer is in the picture

Explanation:

Answer:

C

Explanation:

i did the test and got 100 :)

Answer:

A

Explanation:

Momentum change is basically impulse

Object possessing more velocity after bouncing OR the object which bounces more have more impulse

Answer:

are free to study what causes problems

Answer:

Mark brainliest please

Explanation:

If the data points make a straight line going from the origin out to high x- and y-values, then the variables are said to have a positive correlation .When there is no clear relationship between the two variables, we say there is no correlation between the two variables.

The force that acts on a projectile in the horizontal direction is Gravitational force.

A projectile is an object upon which the only force is gravity. Gravity acts to influence the vertical motion of the projectile, thus causing a vertical acceleration. The horizontal motion of the projectile is the result of the tendency of any object in motion to remain in motion at constant velocity.

Due to the absence of horizontal forces, a projectile remains in motion with a constant horizontal velocity. Horizontal forces are not required to keep a projectile moving horizontally. Hence, The only force acting upon a projectile is gravity.

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The statement that is true about the theory of plate tectonics and the theory of continental drift C. The theory of plate tectonics gives the method by which continents can move as part of plates .

According to the scientific hypothesis of plate tectonics, the underground movements of the Earth create the primary landforms. By explaining a wide range of phenomena, including as mountain-building events, volcanoes, and earthquakes, the theory, which became firmly established in the 1960s, revolutionized the earth sciences.

The scientist Alfred Wegener is most closely connected with the concept of continental drift. Wegener wrote a paper outlining his notion that the continents were "drifting" across the Earth, occasionally crashing through oceans and into one another, in the early 20th century.

According to tectonic theory, the Earth's surface is dynamic and can move up to 1-2 inches every year. The numerous tectonic plates constantly move and interact. The outer layer of the Earth is altered by this motion. The result is earthquakes, volcanoes, and mountains.

Therefore, option C is correct.

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Objective observations do not include bias or opinions.

Observations can capture a child's strengths and weaknesses

This refers to the types of observation that is done through the senses through what we see, touch, feel, hear, smell, and taste.

Hence, we can see that objective observation is important because they provide insight into the strengths and needs of a child.

One of the ways you can capture your observations is through note-taking.

The federal law which ensures that all children and family education information is confidential is called The Family Educational Rights and Privacy Act (FERPA)

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The intensity of waves is 9.96 × 10⁻³W/m².

Power radiated, P = 50 W

Frequency of the sound, f = 1000 Hz

a) Distance, r = 20 m

The intensity of waves,

I = P/4πr²

I = 50/(4π × 20²)

I = 9.96 × 10⁻³W/m²

b) We know that, the intensity of waves,

I ∝ 1/r²

So, I/I' = (r'/r)²

Therefore,

r' = r(√I/I')

r' = 20(√9.96 × 10⁻³/1)

r' = 0.19 m

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Answer:

Ultraviolet rays from sun are very harmful from skin and can cause sunburn and skin diseases especially ultraviolet B rays. A sunscreen  lotion act as a protection barrier on the skin that restrict the direct contact of UV rays with skin and filter the harmful rays to enter the skin.

Radiotherapy is a medical therapy use to treat cancer. Radiotherapy commonly uses x-rays and gamma rays because they are high-energy particles or waves that kills or destroys the cancer cells.

Sunscreen lotion is able to filter this damaging ultraviolet radiation and prevent it from damaging the skin.

The sun reaches us from outer space brings ultraviolet rays to us. Ultraviolet rays are known to have some damaging effects on the skin. One way to protect our skin from this damaging ultraviolet rays is to use sunscreen lotion which is able to filter this damaging ultraviolet radiation and prevent it from damaging the skin.

X-rays and gamma rays are used in radiotherapy because they are light energy rays which are able to penetrate and destroy malignant cells in the body.

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The student does zero work on the backpack because the upward force applied by the student is acting perpendicular to the backpack's displacement parallel to the ground.

Answer:

As the charge increases, the force decreases in strength

Explanation:

Experiments with electric charges have shown that if two objects each have electric charge, then they exert an electric force on each other. The magnitude of the force is linearly proportional to the net charge on each object and inversely proportional to the square of the distance between them...

Answer: The correct answer is: As the charge increases, the force increases in strength

Explanation:

Its kind of the obvious answer and other people don't know how to answer correctly. This was years ago but if anyone needs the answer today then here it is....

The meters in the circuit that shows the amount of charge passing a point each second are A and C ( A )

In the circuit, the meter A and C are connected in series to a resistor and the meters B and D are connected parallel to a resistor. Ammeters should be connected in series and voltmeters should be connected in parallel because the resistance in ammeter is zero and the resistance in a voltmeter is infinite.

Ammeter is used to measure the current flowing through a circuit. It can also be said as amount of charge passing through the circuit. Voltmeter is used to measure the voltage across two points in a circuit.

Therefore, the meters in the circuit that shows the amount of charge passing a point each second are A and C ( A )

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To determine the thrust applied by the engines, we can use Newton's second law of motion, which states that force (thrust) is equal to mass times acceleration. In this case, we need to calculate the force required to decelerate the plane from 30 m/s to 25 m/s in 12 seconds.

First, we calculate the change in velocity (∆v):

\(\displaystyle\sf \Delta v=25\,m/s-30\,m/s=-5\,m/s\)

Next, we calculate the acceleration (∆a) using the formula:

\(\displaystyle\sf \Delta a=\frac{\Delta v}{\Delta t}\)

where ∆t is the change in time, which is 12 seconds in this case.

\(\displaystyle\sf \Delta a=\frac{-5\,m/s}{12\,s}\)

Now, we can determine the force (thrust) applied by the engines using Newton's second law:

\(\displaystyle\sf F=m\cdot a\)

where m is the mass of the airplane, which is 480000 kg.

\(\displaystyle\sf F=480000\,kg\cdot \left(\frac{-5\,m/s}{12\,s}\right)\)

Calculating the result:

\(\displaystyle\sf F=-200000\,N\)

Therefore, the engines applied a thrust of -200000 Newtons (N) to decelerate the plane. The negative sign indicates that the thrust is in the opposite direction of the motion.