An ideal heat engine is operating between high and low temperature reservoirs. Suppose that now the low temperature reservoir has its temperature lowered, but no other changes are made. This temperature change affects the engine efficiency in the following way: Othere is now no way to calculate the efficiency. the efficiency is unchanged. the efficiency decreases. the efficiency increases.

\(\star\sf \overrightarrow{A}=4N\)

\(\star\sf\overrightarrow{B}=6N\)

Angle=160

\(\boxed{\sf R=\sqrt{A^2+B^2+2ABcos\theta}}\)

\(\\ \sf\longmapsto R=\sqrt{4^2+6^2+2(4)(6)cos160}\)

\(\\ \sf\longmapsto R=\sqrt{16+36+48(-0.93)}\)

\(\\ \sf\longmapsto R=\sqrt{52-44.6}\)

\(\\ \sf\longmapsto R=\sqrt{7.4}\)

\(\\ \sf\longmapsto R=2.7N\)

Sure! Here are the steps for calculating the velocity and distance traveled by the car after 50 seconds :

Step 1: Calculate the velocity using the equation:

\(v = u + at\)

where:

- \(v\) is the final velocity

- \(u\) is the initial velocity (0 m/s, as the car starts from rest)

- \(a\) is the acceleration (3 m/s²)

- \(t\) is the time (50 seconds)

Substituting the values into the equation:

\(v = 0 + (3 \, \text{m/s²}) \times (50 \, \text{s})\)

Step 2: Calculate the distance traveled using the equation:

\(s = ut + \frac{1}{2}at^2\)

where:

- \(s\) is the distance traveled

- \(u\) is the initial velocity (0 m/s)

- \(a\) is the acceleration (3 m/s²)

- \(t\) is the time (50 seconds)

Substituting the values into the equation:

\(s = 0 \times (50 \, \text{s}) + \frac{1}{2} \times (3 \, \text{m/s²}) \times (50 \, \text{s})^2\)

Now, let's simplify these equations:

\(v = 3 \times 50\)

\(s = \frac{1}{2} \times 3 \times 50^2\)

Calculating the results:

\(v = 150\) m/s

\(s = 3750\) meters

Therefore, after 50 seconds, the car will have a velocity of 150 m/s and would have traveled a distance of 3750 meters.

Question :-

Answer :-

\( \rule {180pt}{2pt} \)

Given :-

To Find :-

Solution :-

As per the provided information in the given question, we have been given that the Resistance of the Device is 20 Ohm's. It's Current is given as 15 Ampere . And, we have been asked to calculate the Voltage .

For calculating the Voltage , we will use the Formula :-

\( \bigstar \: \: \: \boxed {\sf { \: Voltage \: = \: Current \: \times \: Resistance \: }} \)

Therefore , by Substituting the given values in the above Formula :-

\( \Longrightarrow \: \: \: \sf { Voltage \: = \: Current \: \times \: Resistance } \)

\( \Longrightarrow \: \: \: \sf { Voltage \: = \: 15 \: \times \: 20 } \)

\( \Longrightarrow \: \: \: \bf { Voltage \: = \: 300 } \)

Hence :-

\( \underline {\rule {180pt}{4pt}} \)

Additional Information :-

\( \Longrightarrow \: \: \: \sf {Voltage \: = \: Current \: \times \: Resistance} \)

\( \Longrightarrow \: \: \: \sf {Current \: = \: \dfrac {Voltage}{Resistance}} \)

\( \Longrightarrow \: \: \: \sf {Resistance \: = \: \dfrac {Voltage}{Current} } \)

Answer:

300 volts

Explanation:

now in this question we have been given our resistance which is 20 ohms and our current which is 15A

using ohm's law

V=IR

where v is voltage, I is current and r is resistance

now substitute,

V=15 x 20

V=300

I hope I helped

The average acceleration of the bus during the whole trip is 0.294 m/s².

The average acceleration of the bus can be found by dividing the total change in velocity by the total time taken. The total change in velocity is the difference between the final and initial velocities, which is (15 - 10) m/s = 5 m/s for the first 5 seconds, then (20 - 15) m/s = 5 m/s for the next 4 seconds, and (15 - 20) m/s = -5 m/s for the final 8 seconds.

Therefore, the total change in velocity is 5 + 5 - 5 = 5 m/s. The total time taken is 5 + 4 + 8 = 17 seconds. Therefore, the average acceleration of the bus is 5 m/s divided by 17 seconds, which is approximately 0.294 m/s².

The average acceleration is the overall rate of change in velocity during the entire time period. To find it, we can calculate the total change in velocity and the total time taken.

The total change in velocity is the difference between the final and initial velocities, which is divided into three separate time periods. We add up the changes in velocity for each period to get the total change in velocity. Then, we add up the time taken for each period to get the total time taken.

Finally, we divide the total change in velocity by the total time taken to get the average acceleration. In this case, we get an average acceleration of 0.294 m/s².

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The DOH issues advisories from June to November due to increased health risks associated with the rainy season, disease outbreaks, and the need for preparedness and public education.

The Department of Health (DOH) issues public health advisories during the months of June to November for several reasons related to public health concerns specific to that time period. Here are some possible reasons:

1. Rainy Season: In many regions, June to November corresponds to the rainy season or monsoon season. During this time, there is an increase in rainfall, which can lead to various health risks such as waterborne diseases, flooding, and increased vector population (mosquitoes, rats, etc.). The DOH issues advisories to raise awareness and provide preventive measures against these risks.

2. Disease Outbreaks: Certain diseases are more prevalent or have a higher likelihood of outbreaks during specific months. For example, dengue fever is commonly associated with the rainy season due to the increased breeding of mosquitoes in stagnant water. Leptospirosis, which is transmitted through contaminated water, is also more common during this period. The DOH issues advisories to inform the public about these diseases and how to prevent them.

3. Preparedness and Response: The DOH aims to promote preparedness and timely response to public health emergencies. By issuing advisories in advance, they can inform the public about potential health risks, preventive measures, and necessary actions to take. This helps individuals and communities be better prepared and able to respond effectively to health threats.

4. Awareness and Education: Public health advisories serve as a means to educate and raise awareness about health-related issues. The DOH uses these opportunities to disseminate information on proper hygiene practices, sanitation, vaccination, and other preventive measures. By targeting specific months, they can address the specific health concerns associated with that time of the year.

It's important to note that the specific reasons for issuing advisories during these months may vary depending on the region and prevailing health risks. The DOH assesses local epidemiological data and collaborates with other agencies to determine the appropriate timing and content of the advisories.

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Answer:

50 Joules

Explanation:

Answer:I can't see the question

Explanation:so i dont konw

ANSWER

False.

EXPLANATION

In radioactive decay (or nuclei decay), an unstable nucleus emits radiation into a nucleus that is table and has less energy and a lower mass.

Therefore, nuclei decay from a less stable form to a more stable form.

The answer is false.

Answer:

1) To find the volume of the wood block, divide the mass by the density:

Volume = 583.3 g / 2.7 g/cm³

Volume = 216.24 cm³

2) To find the density of the butter, divide the mass by the volume:

Density = 319 g / 350 cm³

Density = 0.9114 g/cm³

Explanation:

The acceleration experienced by the crate is approximately 0.844 m/s

Weight of the crate:

Weight = mass × acceleration due to gravity

Weight = 114 kg × 10 m/s^2

Weight = 1140 N

Force of friction:

Force of Friction = coefficient of friction × normal force

Force of Friction = 0.541 × 1140 N

Force of Friction ≈ 616.74 N

Net force:

Net Force = Applied Force - Force of Friction

Net Force = 713 N - 616.74 N

Net Force ≈ 96.26 N

Acceleration:

Acceleration = Net Force / mass

Acceleration = 96.26 N / 114 kg

Acceleration ≈ 0.844 m/s

Therefore, the acceleration experienced by the crate is approximately 0.844 m/s

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The change in the momentum was found to be 16,000 kgm/s

Change in momentum ?

Situations involving impulse and momentum are all around us, whether we notice it or not. Before we begin evaluating these daily instances, we'll go over the fundamental ideas of impulse and momentum.

In physics, an impulse (Ft) is a force (F) operating over a certain time (t) that results in a change in momentum (p) of an object. The impulse-momentum theorem is the equation of impulse with the change in momentum.

the change in the momentum was Δp=mxΔv

Δp=2000x8

Δp=16,000 kgm/s

therefore the change in momentum was found to be 16,000kgm/s

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Subjective and symptomatic data are placed in the history section.

Subjective data refers to information provided by the patient regarding their symptoms, feelings, experiences, and perceptions. This type of data is often gathered through interviews or conversations with the patient and is subjective because it is based on the patient's personal interpretation.

Symptomatic data specifically refers to information related to the symptoms experienced by the patient. These symptoms may include physical sensations, discomfort, pain, or changes in bodily functions that the patient reports.

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The impulse delivered to the roof is  -0.115 Ns and the magnitude of the force of the impact is -31.17 kN.

a. Impulse is defined as the product of the force acting on an object and the time over which the force is applied. In this case, the impulse delivered to the roof is the product of the force acting on the raindrop and the time it takes for the raindrop to come to a stop after hitting the roof. Since we don't know the time of impact, we can use the impulse-momentum theorem which states that the impulse of a force acting on an object is equal to the change in momentum of the object.

The impulse delivered to the roof is given by J = Δp = pf - pi

The initial momentum of the raindrop is given by pi = m * vi = 0.014g * 8.1 m/s = 0.115 Ns

Since the final velocity of the raindrop is zero (it comes to rest), the final momentum is zero. Therefore, the impulse delivered to the roof is J = pf - pi = 0 Ns - 0.115 Ns = -0.115 Ns

b. To find the force of the impact we can use the equation: F = J/t

where F is the force of the impact, J is the impulse delivered to the roof, and t is the time it takes for the raindrop to come to a stop after hitting the roof.

We have that t = 0.37 ms = 0.00037 s

So F = J/t = -0.115 Ns / 0.00037 s = -31167.57 N or -31.17 kN

Here, the negative sign of the force tells us that the force is opposite to the direction of motion, which means that the force is acting to stop the motion of the raindrop.

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Answer:

88

Explanation:

Answer:

2

Explanation:

88 was wrong and the answer then said 2

To change the capacitive time constant of the combination to three times its original value, a capacitance of 3.47 microfarads must be placed in parallel with the original capacitance.

The time constant of an RC circuit (resistor-capacitor circuit) is given by the product of resistance and capacitance, i.e., RC. In this case, we have an RC circuit with a resistor of 640 Ω and an unknown capacitance C. Let the original time constant be τ. Then,

τ = RC = 640C

To change the time constant to three times its original value, we need:

3τ = 3RC = 640(3C)

Solving for C, we get:

C = 3.47 microfarads

Therefore, a capacitance of 3.47 microfarads must be placed in parallel with the original capacitance to change the capacitive time constant of the combination to three times its original value.

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Answer:

At time t=0 , Projectile is launched from the top of cliff an angle of 30

Explanation:

45-443tx=332

When the proton passed through magnetic field then the angle between the proton velocity and the field is 49° degrees.

Given

Speed v = 4.00 m/s

Mg field =1.7 T

Force = 8.21  10-3  N

Given:- Velocity of the particle = 4.00x10m/3. 2 Magnitude of the magnetic field B= 1.701.

Force experienced by the particle: 8.20x10¹³N.

To find: The between the particle velocity and field. angle a

We know that :- F= q(√xB)

9 (VBSino) 928 - Sina

Sina = 8.20×10-13 1.6×10-19×4×10 6 x 1.70 = 0.7536.

Sin a = 0.7536. ~ Sin 0 = 0.754

a = sin' (0.7536)

a = 49°

we have a point charge q0 located at r and a set of external charges conspire so as to exert a force F on this charge. We can define the electric field at the point r by: E =Fq0

The (vector) value of the E field depends only on the values and locations of the external charges, because from Coulomb’s law the force on any “test charge” proportional to the value of the charge. However to make this definition really kosher we have to stipulate that the test charge q0 is “small”; otherwise its presence will significantly influence the locations of the external charges.

The electric field is a vector. we can see that its SI units must be It follows from Coulomb’s law that the electric field at point r due to a charge q located at the origin is given by E = kq where r is the unit vector which points in the same direction as r.

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speed of sound is the final velocity \( v=1100\)

and initial velocity $u=600$ , $a=10$

$v=u+at$

$t=\dfrac{v-u}{a}= \dfrac{500}{10}$

$\implies t=50 h$

Answer:

maybe it is the first one

Answer:

It's option 4, 647n!

Explanation:

Ff = μFn

Assuming it's a flat surface, Force normal is equal to the force of gravity. Since the mass is given in kg, we multiply the mass by 9.81 (acceleration due to gravity).

110 x 9.81 = 1079.1

Now we know the force of gravity and the coefficient of friction, we just multiply them.

Ff = 1079.1(0.6) ≈ 647 N

Explanation:

we first convert 2 minutes to seconds,which will give us 120s (2×60).

v=u +at where (v=final velocity,u is the initial velocity,a is the acceleration of the car and t the time taken)

V=25 m/s

u=0 m/s since the car started from rest

t=120s

substituting the values we get

25=0+a (120)

25=120a (diving both sides by 120 we get)

a=0.208m/s^2

Given data

*The given frequency is

*The another given frequency is

*The given speed of light is c = 3.0 × 10^8 m/s

(a)

The formula for the wavelength is given as

Substitute the known values in the above expression as

The another wavelength for the another frequency is calculated as

(b)

Radio spectrum is an electromagnetic spectrum where the frequency range belongs of wireless telecommunication.

The work is given by:

Plugging the values given we have:

Therefore the man do 120 ft*lb of work

"his performing the first successful heart surgery" - This is the correct choice.

We know that the vertical clearance of the crossbar by the ball is x=1.57m.

From a point 36.0 m from the goal, a place kicker must kick a football. The ball must clear the 3.05 m-high crossbar as a consequence of the kick. The ball kicks off the ground with a speed of 20.0 m/s at an angle of 53° from the horizontal.

v=18cos48 m/s

Time is therefore defined as distance multiplied by speed, which equals 28/18cos48 divided by 48, or 2.324

Use s = ut + (0.5)a(t2) when resolving vertically.

Where is the unidentified distance, s? (the height above the GROUND)

initials are u (vertical) 18 divided by 48 gives a speed of -9.8 meters per second (negative since we take upwards as positive)

t = 2.3247... (what we found previously) (what we found previously)

Adding the figures to the formula gives 4.616

Subtracting the goalpost's height (3.05) results in 1.57m above the crossbar, or 1.56.

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The length of the rubber band that the boy must use is 0.024 m or 24 mm.

To determine the length of the rubber band, we can use the formula for the potential energy stored in a stretched spring, which is also applicable to a stretched rubber band:

where U is the potential energy stored in the rubber band, k is the spring constant (or in this case, the rubber band constant), and x is the displacement of the rubber band from its natural length.

Since the rubber band is stretched by 0.25 of its natural length, the displacement x is 0.25 times the natural length of the rubber band.

We can solve for the rubber band constant k by using the formula for the velocity of a projectile launched by a spring (or in this case, a rubber band):

where v is the velocity of the projectile, m is the mass of the rubber band, M is the mass of the projectile, and k is the spring constant. We can rearrange this equation to solve for k:

k = (v² M) / (2 m)

We can now combine the two equations to solve for the length of the rubber band, L:

U = 1/2 k x²

U = 1/2 ((v² M) / (2 m)) (0.25 L)²

U = (v² M L²) / (32 m)

The potential energy stored in the rubber band must be equal to the kinetic energy of the projectile when it is launched:

U = 1/2 M v²

(v² M L²) / (32 m) = 1/2 M v²

L = ((16 m v²) / (k M))

L = ((16 m v²) / ((v² M) / (2 m) M))

L = √(32 m^2 / M)

L = (0.032 M)

Substituting the given values, we get:

L = √(0.032 * 0.006)

L = 0.024 m

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Answer:

D. the water's latent heat of vaporization is being pulled from the air.

Explanation:

A swamp cooler also generally referred to as the evaporative cooler is an electronic device that uses moisture to cool air. This simply means that, the electronic device works on the principle of evaporation of water to cool the surrounding air.

In swamp coolers, water absorbs large amount of warm air via the evaporative wet cooler pad, so as to evaporate and consequently cooling the air effectively and efficiently.

Swamp coolers are effective because the water's latent heat of vaporization is being pulled from the air.

The latent heat of vaporization can be defined as the energy that is being absorbed by water during evaporation.

The swamp coolers are typically made up of the following essential components, these are;

1. Float.

2. Blower.

3. Pump.

4. Evaporative pad.

5. Water supply valve.

Hence, through the principle of evaporative cooling (latent heat of vaporization), swamp coolers reduces or lower the air temperature in its surroundings.

Answer:

B and D

Explanation:

The magnitude of the net force on the block while it is sliding is 9.8 N.

The angle of inclination of the plane is calculated by applying the principle of trigonometry ratio.

Considering the vertical height (10 m) and length of the incline (20 m);

sin θ = 10 m / 20 m

sin θ = 1/2

sin θ = 0.5

θ = arc sin(0.5)

θ  = 30⁰

The magnitude of the net force on the block while it is sliding is calculated as follows;

F(║) = F(net) = mg sinθ

where;

F(net) = (2 x 9.8) x sin(30)

F(net) = 9.8 N

Thus, the net force on the block is the parallel component of the weight of the block.

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The word that BEST describes the area Elliott wants his group to improve is ownership.

option C.

Ownership refers to the idea of ensuring that all members of the group feel they have a stake in decision-making processes, and that their voices are heard and valued.

By giving quieter members more ownership over the group's goals and activities, Elliott can help ensure that everyone feels included and engaged.

Thus, ownership in the context of group dynamics refers to the sense of responsibility and control that individuals feel over their work or contributions to the group.

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