Two identical cars are traveling at the same speed. One is heading due east and the other due north, as the drawing shows. Which statement is true regarding the kinetic energies and momenta of the cars?A) They have the same kinetic energies, but different momenta.B) They have different kinetic energies, but the same momenta.C) They have the same kinetic energies and the same momenta.D) They have different kinetic energies and different momenta.

I believe it’s D, an applied force.

A reaction force seems to refer to Newton’s third law, but is relatively vague to be the answer to this question.

An expected force isn’t a concept nor the name of any subject of forces that is taught within the physics textbooks.

A positive force refers to direction, a negative force can have less, equal, or even more magnitude than the positive force, thus it contradicts itself. As that’s still a force that can push or pull.

So I believe it to be D.

A force that pushes or pulls is known as an applied force. Option D is correct.

Force is defined as an object in motion, and its rate of change of momentum is called force.

here,

A force applied to an object is one that is exerted on it by another object or by an external agent. This force can cause the object to accelerate or change direction. Pushing a book across a table, pulling a sled across the snow, or lifting a weight with a pulley are all examples of applied forces.

It is important to note that for every applied force, there is an equal and opposite reaction force, according to Newton's third law of motion. This means that when an object exerts a force on another object, the second object exerts an equal and opposite force back on the first object. This reaction force is also an applied force, and it can affect the motion of both objects involved.

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Answer: B. Its randomness would increase

Explanation:

According to the second law of thermodynamics:  

"The amount of entropy in the universe tends to increase over time"

That is, in any cyclic process, entropy will increase, or remain the same.

So, in this context, entropy is a thermodynamic quantity defined as a criterion to predict the evolution or transformation of thermodynamic systems. In addition, it is used to measure the degree of organization of a system.  

In other words: Entropy is the measure of the disorder (or randomness) of a system and is a function of state.

Answer:

1/3

Explanation:

We can solve the problem by using the lens equation:

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

where

f is the focal length

p is the distance of the object from the lens

q is the distance of the image from the lens

Here we have a divering lens, so the focal length must be taken as negative (-f). Moreover, we know that the object is placed at a distance of twice the focal length, so

[tex]p=2f[/tex]

So we can find q from the equation:

[tex]\frac{1}{q}=\frac{1}{(-f)}-\frac{1}{p}=-\frac{1}{f}-\frac{1}{2f}=-\frac{3}{2f}\\q=-\frac{2}{3}f[/tex]

Now we can find the magnification of the image, given by:

[tex]M=-\frac{q}{p}=-\frac{-\frac{2}{3}f}{2f}=\frac{1}{3}[/tex]

Answer: false

Explanation:

At the beginning level or novice level the player should involve in a sport at a lower level. This is because of the fact that if he starts at a higher level the player may have to perform responsibilities accordingly. The player at the higher level have to decide the strategy of the competitive sport which an experienced player can justify. But a beginner cannot take such responsibilities and the sports skills of such person may not be good.  

Answer:

Zero

Explanation:

The work done on an object is given by:

[tex]W=Fd cos \theta[/tex]

where

F is the force applied on the object

d is the displacement of the object

[tex]\theta[/tex] is the angle between the direction of the force and the displacement

In this problem, you are pushing again a stationary wall: this means that the walls does not move. As a result, the displacement is zero: d=0. Therefore, the work done is also zero: W=0.

(a) [tex]1.72\cdot 10^{-5} \Omega m[/tex]

The resistance of the rod is given by:

[tex]R=\rho \frac{L}{A}[/tex] (1)

where

[tex]\rho[/tex] is the material resistivity

L = 1.20 m is the length of the rod

A is the cross-sectional area

The radius of the rod is half the diameter: [tex]r=0.570 cm/2=0.285 cm=2.85\cdot 10^{-3} m[/tex], so the cross-sectional area is

[tex]A=\pi r^2=\pi (2.85\cdot 10^{-3} m)^2=2.55\cdot 10^{-5} m^2[/tex]

The resistance at 20°C can be found by using Ohm's law. In fact, we know:

- The voltage at this temperature is V = 15.0 V

- The current at this temperature is I = 18.6 A

So, the resistance is

[tex]R=\frac{V}{I}=\frac{15.0 V}{18.6 A}=0.81 \Omega[/tex]

And now we can re-arrange the eq.(1) to solve for the resistivity:

[tex]\rho=\frac{RA}{L}=\frac{(0.81 \Omega)(2.55\cdot 10^{-5} m^2)}{1.20 m}=1.72\cdot 10^{-5} \Omega m[/tex]

(b) [tex]8.57\cdot 10^{-4} /{\circ}C[/tex]

First of all, let's find the new resistance of the wire at 92.0°C. In this case, the current is

I = 17.5 A

So the resistance is

[tex]R=\frac{V}{I}=\frac{15.0 V}{17.5 A}=0.86 \Omega[/tex]

The equation that gives the change in resistance as a function of the temperature is

[tex]R(T)=R_0 (1+\alpha(T-T_0))[/tex]

where

[tex]R(T)=0.86 \Omega[/tex] is the resistance at the new temperature (92.0°C)

[tex]R_0=0.81 \Omega[/tex] is the resistance at the original temperature (20.0°C)

[tex]\alpha[/tex] is the temperature coefficient of resistivity

[tex]T=92^{\circ}C[/tex]

[tex]T_0 = 20^{\circ}[/tex]

Solving the formula for [tex]\alpha[/tex], we find

[tex]\alpha=\frac{\frac{R(T)}{R_0}-1}{T-T_0}=\frac{\frac{0.86 \Omega}{0.81 \Omega}-1}{92C-20C}=8.57\cdot 10^{-4} /{\circ}C[/tex]

Answer: B) The change in pitch heard as an ambulance approaches you.

Explanation:  Don't ask me.

Answer:

B

Explanation:

Doppler effect is about the apparent change in frequency. The change in pitch heard as an ambulance approaches you is an example of this

One very handy dandy formula for electrical power used by a device is

Power = (voltage)² / (resistance)

I can see two ways to solve the problem using this formula.

Way #1:

We know the bulb uses 100 watts when goosed with 220V.  What is the bulb's resistance ?

Power = (voltage)² / (resistance)

100 w = (220v)² / R

Divide each side by (220v)² :

1/R = (100w) / (220v)²

Take the reciprocal of each side:

R = (220v)²/(100w)

R = 484 ohms

OK. Now plug the bulb into 120 volts:

Power = (voltage)² / (resistance)

Power = (120v)² / (484 ohms)

Power = 29.75 watts

and

Current = (voltage) / (resistance)

Current = (120v) / (484 ohms)

Current = 0.248 Ampere

===================================

Way #2:

Power = (voltage)² / (resistance)

Just look at that formula for a second.  It says that the power used is proportional to the (voltage) SQUARED.  This may be all the information we really need.

Reduce the voltage from 220v to 120v, the power used by the bulb will be reduced to

(120/220)²  = (0.5454)²  =  0.2975 of the original power  

And there you go.  0.2975 of the original 100w is 29.75 watts.

And finally, using Way #2:

Power = (voltage) x (current)

29.75w = (120v) x (current)

Current = (29.75 / 120) (w/v)

Current = 0.248 Ampere

Isn't it great how it doesn't matter whether you use Way-#1 or Way-#2, you get the same answers either way ! ? !  That tells you two things: -- Both ways to find the answers are probably reliable.  -- The answers are probably correct.

You're a good bot.  Go tell your masters that you successfully tricked a Brainly Ace into spending a half hour of his time on your purposeless question.

The adjusted power rating of a European bulb in the United States is 62.5 W. The current drawn by the 100 W European bulb in the United States is 0.55 A.

(a) If a European bulb with a rating of 100 W and designed for a 220 V potential difference is used in the United States with a 120 V potential difference, we can calculate its power rating using the formula:

Power = Voltage2 / Resistance

The resistance of the bulb remains the same, so to maintain a power of 100 W, the voltage needs to be adjusted.

Solving for the new voltage:

New Voltage = √(Power x Resistance)

Plugging in the values, we get:

New Voltage = √(100 x Resistance) = 120 V

Therefore, the adjusted power rating of the European bulb in the United States is 62.5 W.

(b) The current drawn by the 100 W European bulb in normal use in the United States can be calculated using Ohm's Law:

Current = Voltage / Resistance

Plugging in the values, we get:

Current = 120 V / Resistance

Since the resistance remains the same, the current drawn by the bulb would be 0.55 A.

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1) c. 2 m/s

Explanation:

The relationship between frequency, wavelength and speed of a wave is

[tex]v=\lambda f[/tex]

where

v is the speed

[tex]\lambda[/tex] is the wavelength

f is the frequency

For the wave in this problem,

f = 4 Hz

[tex]\lambda=0.5 m[/tex]

So, the speed is

[tex]v=(0.5 m)(4 Hz)=2 m/s[/tex]

2)  a. 2.8 m/s

The speed of the wave on a string is given

[tex]v=\sqrt{\frac{T}{\mu}}[/tex]

where

T is the tension in the string

[tex]\mu[/tex] is the linear mass density

In this problem, we have:

[tex]T=2 \cdot 4 N=8 N[/tex] (final tension in the rope, which is twice the initial tension)

[tex]\mu = 1 kg/m[/tex] --> mass density of the rope

Substituting into the formula, we find

[tex]v=\sqrt{\frac{8 N}{1 kg/m}}=2.8 m/s[/tex]

When the object is lifted 6 meters of the ground , then lifted to 12 meters, it is lifted twice as high ( 6 x 2 = 12).

This means the potential energy is also doubled.

The potential energy of an object lifted 12 meters off the ground, as opposed to 6 meters, would double, assuming the gravitational field strength and the object's mass stay constant.

When discussing potential energy, specifically gravitational potential energy, it is directly related to the height of an object from a reference point, generally the ground. In this scenario of an object being lifted 12 meters instead of 6 meters, the potential energy of the object would essentially double. Gravitational potential energy is calculated as the product of the mass, the gravitational field strength, and the height (PE = mg). As the height is doubled, the potential energy would also double assuming the mass of the object and gravitational field strength remain constant.

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Answer:

d. Longitudinal and mechanical

Explanation:

i'm pretty sure

Sound waves are correctly described as longitudinal and mechanical. They require a medium to travel, making them mechanical, and vibrate in the same direction as the wave's movement, making them longitudinal.

The correct set of terms that describes sound waves is Longitudinal and mechanical. Sound waves are mechanical because they require a medium (like air, water, or a solid substance) in order to travel. They are also longitudinal because the medium's particles vibrate parallel to the direction of the energy transport. This back and forth motion in the same direction of the wave causes compressions (high pressure) and rarefactions (low pressure) within the medium.

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Answer:

The kinetic energy is not conserved

Explanation:

The difference between an elastic and an inelastic collision is the following:

- In an elastic collision, both the total momentum and the total kinetic energy of the system are conserved

- In an inelastic collision, the total momentum of the system is conserved, while the total kinetic energy is not. The reason for that is that during the collisions between the objects involved in the system, part of the total kinetic energy is dissipated (mainly as thermal energy, heat) due to frictional forces acting between the objects/between the objects and the surfaces.

Therefore, the correct answer is

The kinetic energy is not conserved

Answer:

A) The current increases

Explanation:

In the DC limit (that means, very low frequency of the generator), the capacitor acts as an open circuit. In fact, a capacitor consists of two parallel plates which are separated from each other: this means that the current cannot flow through it, but it can only flow through the rest of the circuit.

In the case of a direct current (DC), therefore, the current in the circuit must be zero. For an AC current with very low frequency, the current is still very low, because the polarity of the generator changes direction not very often, so there is still enough time for the capacitor to "block" the current. However, when the frequency of the generator is increased, the polarity changes so fast that the current in the circuit can flow without having time of "hitting" the capacitor, so it has almost no effect and the current in the circuit is maximum.

Final answer:

To find the position of the ball, y, in terms of time, t, we need to consider the forces acting on the ball. The weight of the ball and the force due to air resistance act in opposite directions. By using Newton's second law and integrating the velocity function, we can determine the position function of the ball.Therefore, the position of the ball, y, in terms of time, t, is given by y(t) = -(gt²)/2

Explanation:

To find the position of the ball, y, in terms of time, t, we need to consider the forces acting on the ball. The weight of the ball, mg, and the force due to air resistance, 4v, act in opposite directions. The net force can be calculated using Newton's second law, F = ma.

Using the equation F = ma, we have mg - 4v = ma. Rearranging the equation to solve for v, we get v = (mg - ma)/4. Substitute the given values of m = 0.096 kg, g = 9.8 m/s², and a = 0.075 m/s²into the equation to find v. Then, integrate the velocity function to find the position function y(t).

After solving the integration, we get y(t) = -(gt²)/2 + C, where C is the constant of integration. To find the value of C, we can use the initial condition y(0) = 0. Substituting the values, we find C = 0.

Therefore, the position of the ball, y, in terms of time, t, is given by y(t) = -(gt²)/2

The magnitude charge creates a 1.0 n/c electric field at a point 1.0 m away 1.12×10⁻⁹ C.

The influence or force that a charged particle feels in the presence of other charged particles is described by the fundamental idea in physics known as an electric field. It is a force field that surrounds electric charges and fills the entire universe. Electric charges produce electric fields, which radiate outward in all directions from those charges.

Given:

Electric field, E = 1 N/C

Distance, d = 1 m

The electric field is given as:
E = (kQ)/r²

Q = (Er²)/k

Q = (1×1²)/(9×10⁹)

Q = 1.12×10⁻⁹ C.

Hence, the magnitude charge creates a 1.0 n/c electric field at a point 1.0 m away 1.12×10⁻⁹ C.

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Proteins in our body are assembled according to the instructions encoded in our DNA. The sequence of amino acids dictates the structure and function of the protein.

Proteins in our body are assembled according to the instructions encoded in our DNA. Each gene in the DNA molecule codes for the specific order of amino acids that make up a protein. The sequence of amino acids dictates the structure and function of the protein. Scientists have determined the amino acid sequences and three-dimensional conformation of numerous proteins, providing important insights into how they perform their specific functions in the body.

April 8, 2024

Eclipse will be total over the southern part of the state.  Roughly everything south of Decatur and Springfield.

Brain signals are converted

The binary system that is most likely to contain a black hole is option B, a binary with an X-ray burster.

Space-based black holes are areas where a tremendous amount of mass is crammed into a very small space. As a result, there is an intense gravitational force that prevents even light from escaping. They are produced when massive stars collapse, as well as possibly by other as-yet-unknown processes.

Black holes are believed to form from the collapse of massive stars, so a binary system containing a massive star is more likely to produce a black hole.

Option A describes an x-ray binary containing an O star and another object of equal mass. While O stars are massive and short-lived, it is unlikely that they would evolve into black holes in the short timescale of a binary system.

Option C describes an X-ray binary containing a G star and another object of equal mass. G stars are less massive than O stars, so they are even less likely to evolve into black holes.

Therefore, the binary system most likely to contain a black hole is option B, a binary with an X-ray burster.

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Answer:

b. doubled

Explanation:

The momentum of an object is given by

[tex]p=mv[/tex]

where

m is the object's mass

v is its velocity

We see that the momentum is directly proportional to mass. Therefore if the speed of the object is unchanged, but the mass is doubled: m' = 2m, the new momentum will be

[tex]p'=m' v=(2m v)=2 (mv) = 2 p[/tex]

so the momentum is doubled.

a. 2.9 s

First of all, we can assume that the light of the lightning reaches us instantaneously, since the speed of light is very large and so light takes a negligible time to reach us.

Secondly, the speed of sound in air is

[tex]v=340 m/s[/tex]

So, the difference in time between the moment we see the flash of the lightning and the moment we hear the thunder is simply given by the time it takes for the sound wave to cover the distance of  d = 1 km = 1000 m, so:

[tex]t=\frac{d}{v}=\frac{1000 m}{340 m/s}=2.9 s[/tex]

b. 4.7 s

This part of the exercise is exactly identical to the previous one, except for the fact that this time the distance that the sound should cover is

d = 1.6 km = 1600 m

Therefore, the time difference is

[tex]t=\frac{d}{v}=\frac{1600 m}{340 m/s}=4.7 s[/tex]

The fastest pitch ever thrown was 105 MPH. Hope this helps!

Final answer:

The fastest baseball pitch ever thrown was 160.0 km/h.

Explanation:

Nolan Ryan, a legendary professional baseball player, holds the record for the fastest baseball pitch ever thrown, clocking in at an astonishing speed of 160.0 km/h. Ryan's remarkable achievement showcases the pinnacle of pitching prowess in the world of baseball. His exceptional skill and athleticism have left an indelible mark in sports history, inspiring awe and admiration among fans and fellow athletes alike.

The record-setting pitch not only reflects the physical prowess of a seasoned pitcher but also serves as a testament to the dedication, precision, and power that define the elite echelons of professional baseball. Ryan's feat remains a remarkable benchmark in the annals of the sport, highlighting the unparalleled speed and precision achievable in the art of pitching.

Answer:

6 W

Explanation:

The work done by the force is equal to:

[tex]W=Fd[/tex]

where

F = 4 N is the force exerted

d = 3 m is the displacement

Substituting,

[tex]W=(4 N)(3 m)=12 J[/tex]

The power is equal to the ratio between work done and time taken:

[tex]P=\frac{W}{t}[/tex]

where

W = 12 J is the work done

t = 2 s is the time

Substituting,

[tex]P=\frac{12 J}{2 s}=6 W[/tex]

The power required is 6 Watts.

The question is asking us to calculate the power required to exert a 4-N force over a distance of 3 meters in 2 seconds. To find the power, we can use the formula:

Power = Work / Time

Where work (W) is calculated by:

Work = Force x Distance

In this case, the work done is:

Work = 4 N x 3 m = 12 J (joules)

Now, we divide the work by the time to find the power:

Power = 12 J / 2 s = 6 Watts

Answer:

D) Q/2

Explanation:

The relationship between charge Q, capacitance C and voltage drop V across a capacitor is

[tex]Q=CV[/tex] (1)

In the first part of the problem, we have that the charge stored on the capacitor is Q, when the voltage supplied is V. The capacitance of the parallel-plate capacitor is given by

[tex]C=\frac{\epsilon_0 A}{d}[/tex]

where [tex]\epsilon_0[/tex] is the vacuum permittivity, A is the area of the plates, d is the separation between the plates.

Later, the voltage of the battery is kept constant, V, while the separation between the plates of the capacitor is doubled: [tex]d'=2d[/tex]. The capacitance becomes

[tex]C'=\frac{\epsilon_0 A}{d'}=\frac{\epsilon_0 A}{2d}=\frac{C}{2}[/tex]

And therefore, the new charge stored on the capacitor will be

[tex]Q'=C'V=\frac{C}{2}V=\frac{Q}{2}[/tex]

Using the principle of conservation of energy, we can determine that Tarzan's speed at the bottom of his swing is 21.7 m/s.

The physics problem you have revolves around concepts of kinematics, potential energy and kinetic energy. The total energy in a closed system is conserved. Tarzan's potential energy, when he's at the top of his swing, gets converted to kinetic energy when he is at the bottom of his swing. This fundamental principle is due to the law of conservation of energy.

We can use the potential energy to solve for Tarzan's speed at the bottom of the swing. Tarzan's height, h, at the top of the swing can be found from the equation for the length of the vine and cos(37 degrees) - h = 30m * cos(37), which gives 23.9m. Initially, the total energy is just potential energy, E = m * g * h, and finally just kinetic energy, K = 1/2 * m * v^2.

Equating these two (E=K) gives us m * g * h = 1/2 * m * v^2. The mass cancels and we solve for the speed, v = sqrt(2 * g * h). Using 9.8 m/s^2 for g and 23.9m for h, we can find that v = 21.7 m/s. So Tarzan's speed at the bottom of his swing is 21.7 m/s.

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Tarzan's speed at the bottom of his swing, given a vine length of 30 m and swing angle of 37 degrees, would be roughly 9.4 m/s. This calculation is based on the principles of conservation of energy and pendulum motion in physics.

The subject of this question deals with the concepts of physics, specifically pertaining to pendulum motion and the conservation of energy. Tarzan's speed at the bottom of his swing can be calculated using potential and kinetic energy principles.

When Tarzan is at the top of his swing, all of his energy is gravitational potential energy. As he swings downwards, this potential energy transfers to kinetic energy, which is the energy of movement. The total energy in the system remains constant due to conservation of energy.

The equation we'll use to find Tarzan's speed comes from setting the gravitational potential energy equal to the kinetic energy at the bottom of his swing, thus: mgh = 1/2 * m * v^2. Here, 'm' is the mass (which actually cancels out), 'h' is the height fallen, 'g' is acceleration due to gravity, and 'v' is the speed we want to find. As Tarzan starts at rest, his potential energy is mgh where h = L(1 – cosθ).  We substitute this height into the previous expression solved for speed to get:

v = sqrt(2gh) = sqrt[2 * (9.8 m/s²) * L(1 – cosθ)]. For a vine length L = 30.0 m and swing angle θ = 37 degrees, we find v = sqrt[2 * (9.8 m/s²) * (30m *(1 – cos37°))] ≈ 9.4 m/s.

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Answer:

C) velocity is zero.

Explanation:

In a simple harmonic motion, the total mechanical energy of the system (which remains constant in absence of friction) is given by the sum of the elastic potential energy (U) and the kinetic energy (K) at any moment of the motion:

[tex]E=U+K=\frac{1}{2}kx^2+\frac{1}{2}mv^2[/tex]

where

k is the spring constant

x is the displacement

m is the mass

v is the speed

Since E is a constant number, we immediately see from the formula that, when U increases, K decreases, and viceversa. Therefore, the maximum displacement (maximum x), which corresponds to the maximum potential energy U, will occur when K (kinetic energy) is zero. But K=0 means v=0, so when the velocity is also zero.

Since the kinematic equations include four variables, you only need to know three of the variables to solve for the unknown. Therefore you answer is 3.

To solve using one of the kinematic equations a person must know the value of three variables.

The Equation of Kinematics shown below,

                            [tex]v=u+at\\ \\ s=ut+\frac{1}{2}at^{2} \\ \\ v^{2}=u^{2}+2as [/tex]

Where u is initial velocity, v is final velocity, a is acceleration and t is time , s  is distance.

From observing above equations, there are 4 variables present in all equation.

Hence, To solve using one of the kinematic equations a person must know the value of three variables.

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D. 3600 N

Mechanical advantage is the ratio of force output from a machine divided by the force input into the machine.

That is;

Mechanical advantage = Output Force/Input Force

In this case;

Input force = 800 N

Thus;  Output force = M. A × input force

                                 = 4.5 × 800

                                 = 3600 N

Therefore; the output force by the machine is 3600 N

Atmospheric friction causes an artificial satellite to lose kinetic energy and spiral inward, leading to an increase in its orbital speed due to conservation of angular momentum and stronger gravitational pull at lower altitudes.

Friction with the atmosphere affects the speed of an artificial satellite by causing it to lose energy and gradually spiral inward towards Earth. As a satellite encounters atmospheric drag, it slows down, converting its kinetic energy into heat. Despite this initial deceleration, the satellite's orbital speed actually increases as it gets closer to Earth due to conservation of angular momentum and the increase in gravitational force at lower altitudes.

The circular satellite velocity needed to maintain an orbit close to Earth's surface is approximately 8 kilometers per second, whereas the escape velocity from our planet is 11 kilometers per second. When an artificial satellite like the Apollo mission reentry capsule experiences friction, the air ahead of it is compressed and heated, causing the satellite to glow red hot and lose speed.

However, this is also connected to the principles of gravitation, as demonstrated by the satellite's acceleration inward. This is analogous to an elastic string attached to a whirling stone which shortens due to air friction, causing the stone to spiral inward. Thus, as friction with our atmosphere causes a satellite to descend closer to Earth, the gravitational pull becomes stronger and the satellite's orbital speed increases, even though its total energy is decreasing because of atmospheric drag.

. Chemical energy into kinetic energyd.

Answer:

377 kPa

Explanation:

The absolute pressure of a gas is given by the sum of its gauge pressure and the atmospheric pressure:

[tex]p=p_0 + p_g[/tex]

where

[tex]p_0 = 101 kPa[/tex] is the atmospheric pressure

[tex]p_g[/tex] is the gauge pressure of the gas

In this problem, the gauge pressure of the gas is [tex]p_g = 276 kPa[/tex]. Therefore, the absolute pressure is

[tex]p=101 kPa+276 kPa=377 kPa[/tex]