What is the change in internal energy if 60J of heat are released from a system and 20J of work is done on the system? Use U=Q-W
A. 80J
B. -80J
C. -40J
D. 40J

The clearest example of a neuronal membrane's selective permeability is an option (b) - K+ ions can diffuse across the membrane more easily than Na+ ions. This is because the membrane is more permeable to K+ ions than to Na+ ions.

This is due to the presence of potassium ion channels, which allow K+ ions to easily cross the membrane. On the other hand, the presence of sodium ion channels is limited, which makes it more difficult for Na+ ions to cross the membrane.

The selective permeability of the neuronal membrane is crucial for maintaining the proper functioning of the nervous system. It allows for the regulation of ion concentrations inside and outside the cell, which is essential for generating and transmitting electrical signals. This selective permeability is achieved through the presence of ion channels and transporters that selectively allow certain ions to pass through the membrane.

In summary, the clearest example of a neuronal membrane's selective permeability is the fact that K+ ions can diffuse across the membrane more easily than Na+ ions, due to the presence of potassium ion channels and the limited presence of sodium ion channels. Hence, b is the correct option.

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Therefore, a hotter item will have a shorter wavelength of radiation because of its higher temperature. Hotter objects release photons with shorter wavelengths in accordance with the rules of thermal radiation.

Option D is correct answer.

d. a shorter average wavelength.

The energy of the photon increases with frequency. The number of photons in a light beam is obvious. This means that powerful red light can convey more power to a specific region than less vibrant blue light due to the large number of photons and slightly lower energy .

The atom produces photons when the charge of the electron decreases as it changes levels. The photon is released as the electron moves from the a lower to a state. The energy lost by an electron when it descends to a lower energy level is known as the photon energy.

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Change in momentum formula

The change in momentum resulting from an external force is called the impulse (I=mv-mvo) and is related to the force applied through the Impulse-Momentum Theorem: I = F tc = mv - mvo . Here F is the external force applied and tc is the amount of time the force is in contact with the object.

The final velocity ( Vf ) of the cart at rest is : 0.5 m/s

Change in momentum of the objects  = m₁ * ΔV = m₂ * ΔV --- ( 1 )

Given that momentum ( p ) = m * v

where ; m₁ = 10 kg , p = 10 kg.m/s , v = ?

calculate for v

v = p/m = 10 kg.m/s / 10 kg

            = 1 m/s

Back to equation ( 1 )

= 10 * ( 1 m/s ) =  20 * ( Vf - )

= 10 = -20 Vf  

therefore Vf ( final velocity of cart at rest ) = 10 / 20

                                                                      = 0.5 m/s

Hence we can conclude that The final velocity ( Vf ) of the cart at rest is : 0.5 m/s

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Answer:

i hope it helped U

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Answer:

h = 4.905 m

Explanation:

In order to find the distance covered by the object in 1 second, we can use the second equation of motion:

\(h = v_i t + \frac{1}{2}gt^2\\\)

where,

h = distance covered = ?

vi = initial speed = 0 m/s

g = acceleration due to gravity = 9.81 m/s²

t = time = 1 s

Therefore,

\(h = (0\ m/s)(1\ s)+\frac{1}{2}(9.81\ m/s^2)(1\ s)^2\\\\\)

h = 4.905 m

Answer:

See the explanation below.

Explanation:

We know from Newton's second law that the sum of forces on a body is equal to the product of mass by acceleration. In this way, we have the following equation.

∑F = m*a

where:

∑F = sum of the forces [N] (units of Newtons)

m = mass of the car [kg]

a = acceleration [m/s²]

Therefore we have two forces one that drives the car forward and another that opposes the movement.

\(500-500 = m*a\\m*a=0\\a=0\)

This tells us that the acceleration is zero and therefore the movement is with constant speed. That is, the speed does not vary during the movement of the vehicle.

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 18 × 1.62

We have the final answer as

Hope this helps you

Answer:

Parts of a transverse wave include:

Crest - the highest point on the wave

Trough - the lowest point on the wave

Wavelength - the distance from one crest to the next crest, or one trough to the next trough

Amplitude - the displacement of the wave from the midpoint to the highest point (crest) or the lowest point (trough)

Explanation:

Use the internet Brother

Answer:

Parts of a transverse wave include:

Crest - the highest point on the wave

Trough - the lowest point on the wave

the answer is: WAVELENGTH - the distance from one crest to the next crest, or one trough to the next trough

Amplitude - the displacement of the wave from the midpoint to the highest point (crest) or the lowest point (trough)

Explanation:

Answer:

2515.7N

Explanation:

First step is to find the acceleration:

U = 0 and V =58.7 m/s

a = (V-U)/t

where, t = 3.5s

a = 58.7/3.5

so, in order to find the net force,

F= ma

= 150kg × 58.7/3.5

= 2515.7 N

This question involves the concepts of the speed of sound, frequency, and temperature.

The temperature of the air is "14.24 °C".

First, we find the speed of sound at the given temperature:

v = fλ

where,

Therefore,

v = (695 Hz)(0.49 m)

v = 340.55 m/s

Now, the relationship between the speed of sound and temperature can be given by the following formula:

\(\frac{v}{v_o} = \sqrt{\frac{T}{273\ k}}\\\\T = (273\ k)(\frac{v}{v_o})^2\\\\\)

where,

Therefore,

\(T = (273\ k)(\frac{340.55\ m/s}{332\ m/s})^2\)

T = 287.24 k = (278.24 k -273) °C

T = 14.24 °C

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Answer:

149,916J

Explanation:

Pneumonic device: Kevin is half-mad and very square

this translates to: KE=(1/2)mv^2 !!

KE=(1/2)(78)(62^2)

KE=(39)(3844)

KE=149,916 Joules

Answer:

it's 149916

Explanation:

Formula = 1/2 x m x v^2

so if you put into your calculator 1/2 x 78 x 62^2

you get 149916

Answer: Fossil fuels power the machine that shakes the tree so the apples fall to the ground

Explanation: most machines are powered by fossil fuels

Answer:

i beleive i cannot help you in physics

Explanation:

The expected chain length (number of repeating units per chain) that would be formed in the experiment, assuming all initiators initiate chains and all monomers add onto the chains can be calculated using the following formula.

Expected chain length = (Number of moles of monomers used/Number of moles of initiators used) + 1Where,+ 1 denotes the length of the initiator's unit and is added to the average number of monomer units. Hence, it indicates the length of the polymer's first unit.The number of moles of monomers used can be determined as follows

The number of moles of initiators used can be determined as follows:Number of moles of initiators = (Mass of initiators used/Molecular weight of initiators)Example:If the mass of monomers used is 0.05 g and the molecular weight of monomers is 100 g/mol, then the number of moles of monomers used

= (0.05/100) mol

= 5 × 10⁻⁴ molIf the mass of initiators used is 0.01 g and the molecular weight of initiators is 200 g/mol

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Answer:

75 - Please Give Brainliest

Explanation:

I am using the equation F=ma (force equals mass times acceleration) to solve these problems.

1. You are looking for force, and have mass and acceleration. You just plug in the values for mass and acceleration to get the force needed.

F=(15kg)(5m/s^2)

F=75N

2. Again, you are looking for force, and just need to plug in the values for mass and acceleration

F=(3kg)(2.4m/s^2)

F=7.2N

3. In this problem, you have force and mass, but need to find acceleration. To do this, you need to get acceleration alone on one side of the equation - divide each side by m. Your equation will now be F/m=a

a=(5N)/(3.7kg)

a=18.5m/s^2

I did not use significant figures. Let me know if you need to do that and need any help on that. Hope this helps!

The formula for the covalent compound dichlorine Heptoxite is CL2O6.

Name the first element first then name the second element using the element name stem and the ide suffix. If there are multiple atoms of the first element use the numeric prefix. Always use a numeric prefix for the atomic number of the second element. Dichloroheptoxide is a compound of a clear oily liquid. It is a strong oxidizing agent.

The hardness of a diamond can be read from its crystal structure. Each carbon atom is bound to four other carbon atoms by covalent bonds in a regular tetrahedral structure. Each of these bonded carbon atoms is then further bonded to three other carbon atoms. In the semiconductor industry, chlorine trifluoride is used to clean chemical vapor deposition chambers. Advantageously the semiconductor material can be removed from the chamber walls without the need to dismantle the chamber.

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Answer:

Below

Explanation:

There are 2 sig figs in 120000. They are the 1 and 2.

Zeros at the end of a whole number are NOT considered significant. And since there are no decimals that come before the trailing zeros they are not significant.

Hope this helps!

Answer:

14.3 x 10^8Hz

Explanation:

Using

Frequency= speed of light /wavelength

Then substituting

3*10^8m/s / 0.21m

= 14.3 x10^8 Hz

Answer:

Atoms, molecules,  ions are all present in gases, liquids, and solids, but their behavior varies depending on the process. ...gas are well separated and not arranged in any particular order. There is no regular arrangement of liquids, so they are close together. Solids are arranged in a regular pattern and are tightly packed

Explanation:

Answer:

When a fluid flows into a narrower channel, its speed increases. That means its kinetic energy also increases. Where does that change in kinetic energy come from? The increased kinetic energy comes from the net work done on the fluid to push it into the channel and the work done on the fluid by the gravitational force, if the fluid changes vertical position. Recall the work-energy theorem,

There is a pressure difference when the channel narrows. This pressure difference results in a net force on the fluid: recall that pressure times area equals force. The net work done increases the fluid’s kinetic energy. As a result, the pressure will drop in a rapidly-moving fluid, whether or not the fluid is confined to a tube.

There are a number of common examples of pressure dropping in rapidly-moving fluids. Shower curtains have a disagreeable habit of bulging into the shower stall when the shower is on. The high-velocity stream of water and air creates a region of lower pressure inside the shower, and standard atmospheric pressure on the other side. The pressure difference results in a net force inward pushing the curtain in. You may also have noticed that when passing a truck on the highway, your car tends to veer toward it. The reason is the same—the high velocity of the air between the car and the truck creates a region of lower pressure, and the vehicles are pushed together by greater pressure on the outside.  This effect was observed as far back as the mid-1800s, when it was found that trains passing in opposite directions tipped precariously toward one another.

Explanation:

The air flowing over a roof top which has a high velocity as compared to that flowing underneath. This is because of the increase in the kinetic energy of the air.

Kinetic energy is the energy which is due to the motion of an object. It is the energy which is present inside the body of an object which is in motion. Kinetic energy undergoes transformation to potential energy when the object comes at rest. The SI unit of Kinetic energy is Joule (J). Kinetic energy is a vector quantity as it has both the magnitude and direction.

When a fluid or other substances such as air flows into a narrower channel, the speed or velocity of the compound increases. This means that the kinetic energy of the substance also increases. This is because, kinetic energy is directly proportional to the velocity of the object.

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Answer:

B. Convection

Explanation:

Convection is the process in which heat is transferred from one point to another by the actual movement of the material particles from a region of high temperature to a region of low temperature.

The force that acts in a direction opposite to the motion of the moving object is called drag or air resistance.

Drag or air resistance is a force that acts on a moving object in a fluid medium, such as air or water, opposing its motion. It acts in a direction opposite to the motion of the object and is caused by the friction and pressure differences between the fluid and the object's surface. Drag force increases with the velocity of the object and its surface area, and it's usually modeled as a quadratic function of the velocity. For example, when a car is moving, the air resistance acts in the opposite direction of the car's motion, slowing it down. The drag force is not the only force that acts on the object, but it's one of the most significant forces acting on it, especially for objects moving at high speeds.

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Answer:

answer a

Explanation:

while any machine is working, there are some forces (f.e. friction) that are still calculating.

Good luck

electromagnetic

all electromagnetic waves move at the speed of light.

so yes, light waves are electromagnetic waves :)

i hope this helps!

Jack is approximately 60.15 meters from the wall when he is at point A.

To find the distance between Jack and the wall when he is at point A, we need to follow these steps:
1. Determine the angle formed between the wall, the center of the Merry-Go-Round, and point A.
2. Use the Law of Cosines to find the distance between Jack and the wall.
Step 1:
Since the Merry-Go-Round rotates counterclockwise 75°, the angle between the wall, the center of the Merry-Go-Round, and point A will be 75°.
Step 2:
Using the Law of Cosines with the given angle and sides:
Let the distance between Jack and the wall be x.
x² = 50² + 40² - 2(50)(40)cos(75°)
x² = 2500 + 1600 - 4000cos(75°)
x² ≈ 3617.83
Now find the square root of x² to get the distance x:
x ≈ √3617.83
x ≈ 60.15
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Part A: If air resistance is ignored, the cap will be moving at **speed v** when it comes back down to your hands.

When the cap is thrown straight up, it experiences only the force of gravity acting on it. As it reaches its highest point, its velocity gradually decreases to zero. As it falls back down, it accelerates due to the gravitational force, and its speed increases until it reaches the same magnitude as the initial velocity v.

Part B: If air resistance is not ignored, the cap will be moving at **speed less than v** when it comes back down to your hands.

When air resistance is considered, it acts as a resistive force opposing the motion of the cap. As the cap moves upward, air resistance slows it down, resulting in a lower maximum height than in the case without air resistance. As it falls back down, air resistance continues to act in the opposite direction, limiting its speed. Therefore, the cap will come back down to your hands with a speed less than the initial velocity v.

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Answer: 1.2 x 10^7kg

Explanation:

Volume of tank = length x width x height

Volume = 51 x 20 x 11

Volume = 11220 m^3

Density = Mass/Volume

Density = 1030 kg/m^3

Volume = 11220 m^3

Mass = m

1030 = m/11220

m = 1030 x 11220

m = 11,556,600 kg or 1.2 x 10^7kg