A real heat engine operates between two temperatures, 631 and -228. The engine is able to take 136 from the hot side, do some work and then reject 67 to the cold side. Determine the real efficiency of this engine (in %).

Answer:

Heavier than 2.2 pounds

Explanation:

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

To calculate the wavelength of a radio station's frequency, we can use the formula:

Wavelength = Speed of Light / Frequency

The speed of light is approximately 3 x 10^8 meters per second.

Given that the frequency of WYEP radio station is 9.13 x 10^7 hertz (91.3 megahertz), we can plug in the values:

Wavelength = (3 x 10^8 m/s) / (9.13 x 10^7 Hz)

Dividing the values, we get:

Wavelength = 3.28 meters

Therefore, the wavelength of WYEP radio station's frequency is approximately 3.28 meters.\(\)\(\huge{\mathcal{\colorbox{black}{\textcolor{lime}{\textsf{I hope this helps !}}}}}\)

♥️ \(\large{\textcolor{red}{\underline{\texttt{SUMIT ROY (:}}}}\)

Answer:

Great question! To solve this problem you just need a bit of simple math. The short answer is 60 m/s

Explanation:

To solve this, you must first set up your equation.

540km/2.5hr * 1000m/3600s

You would set it up this way because there are 1000 meters in a km and 3600 seconds in an hour. This

540000m/9000s

This simplifies down to

60m/s

After a warm front passes through the air, the air becomes more warm and humid.

If warm air mass replaces the cold air mass, it is called as warm front. A warm front is called as transition zone. Warm fronts usually move from southwest to northeast. Warm fronts move slower than cold fronts.

When a warm front passes over a region there will be some significant weather changes. Before the warm front passes precipitation will be light to moderate, snow, sleet or drizzle and after the front has passed there will be usually no precipitation.

Therefore, after a warm front passes through the air, the air becomes more warm and humid.

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Since the pulley has no friction, its inertia may be disregarded. When the spring is retracted, the object is set free from its resting position.

An anti-static displacement spring F = k-x, where k is a constant for a specific spring and 'x' is the compression (or distension) length It is necessary to specify the moment of inertia in relation to a selected axis of rotation. The moment of inertia for a point mass is equal to the mass times the square of the distance perpendicular to the rotation axis, or I = mr2. F = -kx. The term "spring constant" refers to the proportional constant k. It gauges the stiffness of the spring. A spring exerts a force in the direction of its equilibrium position when it is stretched or compressed to a length that differs by an amount x from its equilibrium length.

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Answer:

Answer to the question is 4 / 5

The acceleration of block B is 4.26 m/s^2 downwards due to the net force acting on it, which is the difference between the tension and the gravitational force.

To calculate the acceleration of block B, we need to consider the forces acting on it. Block B is connected to block A by a cable that has a tension of 3 N. Block B is also subject to a gravitational force of 39.2 N (4 kg x 9.8 m/s^2).

The net force acting on block B is the difference between the tension and the gravitational force, which is 3 N - 39.2 N = -36.2 N. Since the net force is negative, the acceleration of block B is also negative, which means it is moving downwards.

To calculate the magnitude of the acceleration, we use Newton's second law: F = ma, where F is the net force, m is the mass of the object, and a is the acceleration. Solving for a, we get a = F/m = -36.2 N / 4 kg = -9.05 m/s^2. The negative sign indicates that the acceleration is downwards.

However, the question asks for the magnitude of the acceleration, which is the absolute value of -9.05 m/s^2, which is 9.05 m/s^2. Therefore, the acceleration of block B is 4.26 m/s^2 downwards.

In conclusion, the acceleration of block B is 4.26 m/s^2 downwards due to the net force acting on it, which is the difference between the tension and the gravitational force.

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The value of force is 1.7 × 10⁻³ N, with the direction opposite to that of the bat's motion.

When an object collides with another object, they exchange energy. For example, a baseball and bat collision or a car collision. When two objects collide, the force of the collision has to be equal on both sides of the collision according to Newton's Third Law. So, to find the value of force, we will apply the equation:

F = ΔP / ΔT

where F is the force, ΔP is the change in momentum, and ΔT is the time of collision. The equation represents the impulse momentum theorem.

Now, let's apply the given values to the above equation.

Final momentum (p2) = mass × final velocity (v2)

p2 = 0.15 kg × (-50 m/s)

p2 = -7.5 kg.m/s

Initial momentum (p1) = mass × initial velocity (v1)

p1 = 0.15 kg × (40 m/s)

p1 = 6 kg.m/s

Change in momentum (ΔP) = p2 - p1

ΔP = -7.5 kg.m/s - 6 kg.m/s

ΔP = -13.5 kg.m/s

Time of collision (ΔT) = 8.0 × 10³ s

Now, putting the values of ΔP and ΔT in the equation of impulse momentum theorem, we get:

F = ΔP / ΔT

F = -13.5 kg.m/s ÷ 8.0 × 10³ s

F = -1.7 × 10⁻³ N

Thus, the value of force is 1.7 × 10⁻³ N, with the direction opposite to that of the bat's motion.

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The momentum of the ostrich is determined as 2,282 kg m/s.

The momentum of an object is defined as the product of mass and velocity of the object.

The momentum of the ostrich running at the given velocity is calculated by applying the following formula as shown below.

P = m v

where;

P = 163 kg  x  14 m/s

P = 2,282 kg m/s

Thus, the momentum of the ostrich is a function of mass of the ostrich and velocity of the ostrich.

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The direction of the vector is approximately 330.06 degrees.

To find the direction of a vector given its components, we can use trigonometry. The direction of a vector is typically represented by an angle measured counterclockwise from the positive x-axis.

Let's denote the x-component as x = -309 m and the y-component as y = 187 m. To find the direction, we can calculate the tangent of the angle using the formula:

θ = arctan(y/x)

Substituting the given values, we have:

θ = arctan(187/-309)

Using a scientific calculator or trigonometric tables, we find that the arctan of this ratio is approximately -30.06 degrees.

Since the direction is measured counterclockwise from the positive x-axis, we can express the direction as 360 degrees minus the calculated angle. In this case, the direction is approximately 330.06 degrees.

Therefore, the direction of the vector is approximately 330.06 degrees.

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48 m/s in terms of km/h is 720.8 km/h. In terms of m/min is 2880 m/min, in terms of km/s is 0.048 km/s and in terms of km/min is 2.88 km/min.

To solve this question, we need to understand some terms. The unit of velocity is measured in m/s. It can be expressed in different units of velocity.

1 km (kilometer) = 1000 meter

1 h (hour) = 3600 seconds

1 minutes = 60 seconds

To convert m/s into km/h,

48 m/s * 3600/1000 =  172.8 km/h

To convert m/s into m/min,

48 m/s * 60 = 2880 m/min

To convert m/s into km/s,

48 m/s ÷ 1000 = 0.048 km/s

To convert m/s into km/minutes,

48 m/s * 60 / 1000 = 2.88 km/min

Therefore, the 48 m/s expressed is 172.8 km/h, 2880 m/min, 0.048 km/s and 2.88 km/min.

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48 m/s is equivalent to  172.8 km/h, 2880 m/min, 0.048 km/s, and 2.88 km/minute.

To express 48 m/s in different units of velocity:

km/h (kilometers per hour):

To convert m/s to km/h, we can use the conversion factor of 3.6 since 1 m/s is equal to 3.6 km/h.

48 m/s * (3.6 km/h / 1 m/s) = 172.8 km/h

Therefore, 48 m/s is equivalent to 172.8 km/h.

m/min (meters per minute):

To convert m/s to m/min, we can use the conversion factor of 60 since there are 60 seconds in a minute.

48 m/s * (60 m/min / 1 s) = 2880 m/min

Therefore, 48 m/s is equivalent to 2880 m/min.

km/s (kilometers per second):

Since 1 kilometer is equal to 1000 meters, to convert m/s to km/s, we divide the value by 1000.

48 m/s / 1000 = 0.048 km/s

Therefore, 48 m/s is equivalent to 0.048 km/s.

km/minute (kilometers per minute):

To convert m/s to km/minute, we first need to convert m/s to km/s (as calculated in the previous step) and then multiply by 60 to convert seconds to minutes.

0.048 km/s * 60 = 2.88 km/minute

So, 48 m/s is equivalent to 2.88 km/minute.

Hence, 48 m/s is equivalent to approximately 172.8 km/h, 2880 m/min, 0.048 km/s, and 2.88 km/minute.

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The box will have the greatest velocity just before striking the ground when it is dropped without initial velocity (i.e. dropped from rest).

This is because the velocity of a freely falling object under the influence of gravity increases with time, following the equation v = gt, where v is velocity, g is the acceleration due to gravity (9.8 m/s^2 on the Earth's surface), and t is time.

The velocity of the box continues to increase as it falls, reaching its maximum just before it strikes the ground.

If the box is given an initial velocity, for example by being thrown, it will still increase in velocity as it falls, but the maximum velocity will be less than if it was dropped from rest.

The final velocity of the box just before striking the ground will depend on the height from which it was dropped and the time taken to fall.

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Answer:

Gravitational force affects weight, weight changes with change in gravity

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The emotion that occurs more often to more drivers is frustration.

What is frustration? Frustration is a feeling of dissatisfaction, displeasure, and discontent that arises as a result of an inability to fulfill a need or a goal. In driving, frustration is a common emotional state that occurs when a person is prevented from driving at their preferred pace, or when a person experiences unexpected events while driving, such as traffic jams or sudden accidents. Frustration may be caused by a variety of factors, including:

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Answer:

D. chemical control

Explanation:

The reason for using chemical control as last resort in IPM is:

1) Impact is very high

2) The response is immediate

Given:

The speed of the train is,

The actual frequency of the whistle is,

The speed of sound in air is,

To find:

The frequency heard by the observer

Explanation:

The apparent frequency when the train approaches the observer is given by,

Hence, the frequency heard by you is 209.2 Hz.

Answer:

V = IR

V = voltage = 9 volts

I = current

R = resistance = 18 ohms

V = IR

9 = I·18

A particular charge density produces an electric field, however, the presence of the dielectric reduces this field.

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Answer:

The atomic number is typically located above the element symbol. ... The atomic mass number is equal to the number of protons plus neutrons, which provides the average weight of all isotopes of any given element. This number is typically found beneath the element symbol.

Explanation:

The periodic table is the systematic arrangement of the elements in the increasing order of their atomic number.

The periodic table is the organized arrangement of all the elements, arranged in the increasing order of their atomic numbers.

The elements are grouped into the s-block, p-block, d-block and the f-block elements in the periodic table.

The atomic number is typically located above the element symbol. The atomic mass number is equal to the number of protons plus neutrons,

which provides the average weight of all isotopes of any given element. This number is typically found beneath the element symbol.

Thus the periodic table is the systematic arrangement of the elements in the increasing order of their atomic number.

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When a solid cube is submerged in a container of water of density rhow, the buoyant force on the cube of magnitude rhowVcg.

The buoyant force can be determined by calculating the difference between the cube's weight and the weight of an equal volume of water.The cube experiences a buoyant force of Fb = rhow * Vc * g, where Vc is the cube's volume and g is the acceleration due to gravity.The buoyant force on the cube is proportional to the volume of fluid displaced by the cube. The cube will displace a volume of water equal to its volume, Vc. The buoyant force, Fb, is given by the equation:Fb = rhow * Vc * gThe weight of the cube, Fg, is given by:

Fg = M * g

The net force acting on the cube, Fnet, is:Fnet = Fb - FgThe acceleration of the cube, a, is given by:

Fnet = Maa = Fnet / M

The magnitude of the acceleration of the cube immediately after release is given by:

a = (rhow * Vc * g - M * g) / M

= g * (rhow * Vc / M - 1)

The correct option is:(g * (rhow * Vc / M - 1)).

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Answer:

1) Yes, the gazelle gets to safety

2) The speed with which the gazelle needs to run, to beat the cheater by 2 seconds is approximately 29.79 m/s

Explanation:

1) The distance of the gazelle, from the gazelle safe zone = 275 m

The distance of the cheetah from the gazelle = 455 m

The speed of the gazelle = 25 m/s

The speed of the cheetah = 65 m/s

Therefore, we have;

Let the time the gazelle reaches the safe zone = t, which gives;

t = 275 m/(25 m/s) = 11

t = 11 seconds

Let the time the cheetah reaches the gazelle = t₁, we have;

455 + 25 × t₁ = 65 × t₁

t₁ = 455/40 = 11.375

t₁ = 11.375 seconds

The gazelle reaches the gazelle safe zone before the cheetah reaches the gazelle

Therefore, the gazelle gets to safety

2) In order for the gazelle to beat the gazelle by 2 seconds, we have;

The time for the cheetah to reach the safe zone = (275 + 455)/65 = 11.23 seconds

Therefore, we have;

In order for the gazelle to beat the gazelle by 2 seconds the time the cheetah reaches the safe zone = 11.23 - 2 = 9.23 s

The speed of the gazelle is then 275/9.23 ≈ 29.79 m/s

Answer: d = r · t d + 300cheertah = 18t gazelle = 16t the running times are equal!   (d + 300) / 18 = d / 16   Solve ford then determine time.

sorry if its confusing

Answer:

True

Explanation:

Because with more force the car will move faster than it did before!!!

The magnitude of the average velocity = 1.5 m/s ( D )

Applying the given data:

Velocity = displacement / time

constant velocity/speed = 1.5 m/s  ( i.e. velocity for each direction )

displacement = 75 m west and 75 m North

∴ Average velocity = ∑ ( velocity for each direction ) / ( number of displace )

                               = (1.5 + 1.5 ) / 2

                               = 3 / 2 = 1.5 m/s              

Hence we can conclude that the magnitude of the average velocity = 1.5 m/s

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The statement best describes the purpose of the experiment is A ) To relate the type of box material to the temperature of air within the box

Here, two boxes of same size is exposed to sunlight for the same amount of time. The only different factor is the material of the box. So, only factors relating to the material of box might change. The temperature of air inside the box will change due to the material of box.  

The glass allows up to 90 % of visible light and 72 % of UV light to pass through whereas plastic does not allow UV light to pass through. So there will be a temperature difference between the air in two boxes made of glass and clear plastic.

Therefore, the purpose of this experiment is to relate the type of box material to the temperature of air within the box ( A )

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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:

To predict future climate, scientists use computer programs called climate models to understand how our planet is becoming different. Climate models work like a laboratory in a computer. They allow scientists to study how the unlike factors interact to influence a region's climate.

Now a new evaluation of global climate models used to project Earth's future global average surface temperatures over the past half-century answers that question: most of the models have been reasonably accurate.

Explanation:

I got a 100% on this assignment copy it and put it on your notes then go sentence by sentence copy but dont highlight any "." you will not be able to paste it into the box add the "." after you paste it, it one sentence.

ONE SENTENCE AT A TIME NO ". ' - or :" AT ALL