1. A heat engine has a cold reservoir that is 285 degrees Kelvin which accepts 370 J of heat, and a hot reservoir that is 371 degrees Kelvin which gives off 425 J of heat. Calculate the maximum and actual efficiencies of this engine.


2. A system that has a total change in entropy of 675 J/K and has received 243 J of heat energy will be at what temperature?


3. Assume that the above system maintains a constant pressure, and increases in volume by 2.5 m 3 while doing this work. What is the pressure of the system?

Answer: D

Explanation: I saw it in a bill nye video.

Answer:

v = 6.95 m/s

Explanation:

Given that,

A diver is on a board 1.80 m above  the water, s = 1.8 m

The initial speed of the diver, u = 3.62 m/s

Let v is the speed with which she hit the water. It will move under the action of gravity. Using the equation of motion as follows :

\(v^2-u^2=2gs\\\\v=\sqrt{u^2+2gs} \\\\v=\sqrt{(3.62)^2+2(9.8)(1.8)} \\\\v=6.95\ m/s\)

So, she will hit the water with a speed of 6.95 m/s.

it's C

because the faster an object moves the more kinetic energy it has.

The pressure from each foot of an elephant, with a mass of 3200kg, and each foot covering an area of 0.08m, is calculated to be 500kPa.

To calculate the pressure from each foot of an elephant, we need to use the formula for pressure, which is force per unit area. In this case, we don't have the force, but we have the mass of the elephant, which we can use with the formula for weight, which is mass times gravity.

So, the weight of the elephant is:

Weight = mass x gravity

Weight = 3200kg x 9.8m/s^2

Weight = 31,360N

Now, we need to divide this weight by the total area covered by all four feet (0.08m x 4), to get the pressure from each foot:

Pressure = Weight / Area

Pressure = 31,360N / (0.08m x 4)

Pressure = 500kPa

Therefore, the pressure from each foot of an elephant is calculated to be 500kPa.

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Answer:

D. Output force

Explanation:

The input force is the effort used to run the machine and this results in an output force.

The body is experiencing negative angular acceleration or angular deceleration.

The temporal rate at which angular velocity changes is known as angular acceleration. The standard unit of measurement is radians per second per second.

The angular acceleration can be determined using the formula:

angular acceleration = (change in angular velocity) / (time taken)

In this case, the change in angular velocity is:

(change in angular velocity) = final angular velocity - initial angular velocity

= (-40 rad/s) - (-20 rad/s)

= -20 rad/s

Assuming that the time taken for this change in angular velocity is not given, we cannot determine the angular acceleration directly using the above formula. However, we can say that the angular acceleration must be negative, as the angular velocity is decreasing (going from -20 rad/s to -40 rad/s). This means that the body is undergoing angular deceleration, or negative angular acceleration.

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Answer:

Rubber

Glass

Pure water

Oil

Air

Diamond

Dry wood

Dry cotton

Plastic

Asphalt

Other strong insulators include:

Fiberglass

Dry paper

Porcelain

Ceramics

Quartz

Explanation:

I hope this helps

The carbon isotope was cobined with the proton to produce the nitrogen isotope hence it is a fusion reaction.

The term nuclear fusion refers to a kind of reaction in which two nuclei fuse together to give rise to a single nuclei with the evolution of energy.

We can see that the carbon isotope was cobined with the proton to produce the nitrogen isotope hence it is a fusion reaction.

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Answer:

A. Nuclear fusion

Explanation:

got it right, trust

Answer:

a) first class lever

Think of a cube that is 1 cm by 1 cm by 1 cm. The volume of this cube is 1*1*1 = 1 cubic cm = cm^3. This is equivalent to 1 mL by definition

So the object's volume of 5 mL is the same as 5 cm^3.

To get the density of an object, we divide the mass over volume

density = (mass)/(volume)

density = (20 kg)/(5 mL)

density = (20 kg)/(5 cm^3)

density = (20/5) (kg/cm^3)

density = 4 kg/cm^3

The density is 4 kilograms per cubic centimeter. In other words, each cubic centimeter of volume has about 4 kilograms of material.

Therefore, based on the estimated duration of a galactic year, Earth has been around for approximately 18.4 to 20.4 galactic ye

A "galactic year" refers to the time it takes for our solar system to complete one orbit around the Milky Way galaxy. The exact duration of a galactic year is not precisely determined due to various factors, such as the varying speeds of stars within the galaxy. However, it is estimated to be roughly 225-250 million years.

To calculate the number of galactic years Earth has been around based on the age of the solar system (4.6 billion years), we can divide the age of the solar system by the estimated duration of a galactic year:

Number of Galactic Years = Age of the Solar System ÷ Duration of a Galactic Year

Number of Galactic Years = 4.6 billion years ÷ 225-250 million years

Number of Galactic Years ≈ 18.4 to 20.4 galactic years

Therefore, based on the estimated duration of a galactic year, Earth has been around for approximately 18.4 to 20.4 galactic years.

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Answer:

hello! Jaesuk~Sakai here!

Explanation:

The four group 3 elements are scandium, yttrium, lanthanum and actinium. “lanthanide” refers to the elements between lanthanum and lutetium. That term does not encompass scandium and yttrium. Scandium and yttrium act pretty much identically to lanthanides.

happy to help!!

Remember to always stay happy no matter what happens! ^^

Answer:

6 m/s East

Explanation:

Momentum = Mass . Velocity

26100 = 4350. Velocity

Velocity = 6m/s East

Series connection is advantageous over parallel connection as a parallel circuit consumes more power than a series circuit.

While the voltage across each appliance is the same in a parallel connection, the current passing through each appliance is different in a series connection. A parallel circuit also consumes more energy than a series circuit despite being more dependable.

The quantity of current flowing through each of the circuit's components is the primary distinction between a parallel and a series circuit. The quantity of current flowing through each component in a series circuit is the same.

In comparison to a parallel circuit, a series circuit extends the battery's life. Compared to parallel or series-parallel wiring, this technique of electrical wiring is the most straightforward, and errors are much easier to spot and fix.

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Answer:

Voltage across 3 resistor =13.5v

Explanation:

Voltage=resistance *Current

But we don't have total current, so we must find total current

Current =v/R

Current=9/2

Current =4.5I

From

V=R*I

V=3*4.5

V=13.5v

Answer:

C. Chemical-> mechanical-> thermal

Explanation:

The energy conversion for the propane, that is, energy transformations that occur when propane gas is used to lift the balloon will be:

Chemical energy converting to mechanical energy which later converted to thermal energy

The correct option is therefore Chemical-> mechanical-> thermal which is option C

Answer: 10m/s^2

Explanation:

Given the following :

Initial Velocity(U) = 10m/s

Angle of inclination = 30°

In other to calculate the magnitude of the vector,

We need to resolve into verti AL and horizontal component.

Vertical component of a vector(Uy) = U × Sinθ

Horizontal component(Ux) = U × Cosθ

Uy = 10 × sin30 = 10 × 0.5 = 5m/s

Ux = 10 × Cos30 = 10 × 0.866 = 8.66m/s

Therefore the magnitude equals :

U = √(Uy)^2 + (Ux)^2

U = √5^2 + 8.66^2

U = √25 + 74.9956

U = √99.9956

U = 9.9997799

U = 10m/s^2

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\(\large \bold {ANSWER}\)

✏️ The value of kinetic energy is 400000 J.

\(\large \bold {SOLUTION}\)

Solve by applying the kinetic energy formula, where Ec is kinetic energy, m is mass, v is velocity in m/s. Remember that 72 km/h is 20 m/s.

\(\begin{gathered}\Large \text {$ \sf Ec = \dfrac {m \times v^2}{2} $}\\\\\Large \text {$ \sf Ec = \dfrac {2000 \times 20^2}{2} = 400000 $ J}\end{gathered}\)

Answer:

400 000 joules

Explanation:

Kinetic energy is measured in joules which has units of  kg - m^2 / s^2

so you will need to convert 72 km/hr to   m/ s

   =    72000 m / 3600 s = 20 m/s

KE = 1/2 m v^2

    = 1/2 (2000)(20^2) = 400 000 Joules

The angle through which it turn during that time interval if the angular acceleration is constant is 32 rad.

Angular displacement is defined as “the angle in radians (degrees, revolutions) through which a point or line has been rotated in a specified sense about a specified axis”. It is the angle of the movement of a body in a circular path.

The angular displacement will be

= average angular velocity × time period

=( final angular velocity + initial angular velocity/ 2) × time period

=( 12rad/s + 4rad/s/2 ) × (4 s)

= 8 × 4 rad

= 32rad.

Therefore, it turn through an angle of 32rad during that time interval.

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Answer:

d.) Newton's first law

Explanation:

This is also called the law of inertia, which means that an object in motion will not stop unless a force is acted upon it, and vice versa. Try this out with a piece of paper and a quarter. Pull the paper from under the quarter slightly quick, and the quarter will stay on the table. Hope i helped you.

Since Alejandro hopes to combine the findings from the collected studies and draw a general conclusion regarding the subject, he is using statistical tool of inference.

There are basically 2 types of statistical tools:

Descriptive tools are used to describe data. They include the use of tables, graphs, measures of dispersion, measures of central tendencies, etc.

Inferential tools are used to deduce conclusions from data. They include measures of significant differences, probability, correlation and regression, etc.

In this case, Alejandro would need to subject the data collected from the 35 studies to inferential statistical analysis tools in order to be able to make relevant conclusions.

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Answer:

v_{f}=21.75[m/s] (velocity just before it lands)

t = 2.98 [s]

Explanation:

The key to solving this problem is the initial velocity since when the camera falls it is moving up, we will take this velocity as negative and the acceleration gravitation down as positive.

We will use the following equation of kinematics to solve this problem.

\(V_{f}^{2} =V_{o}^{2}+2*g*y\)

where:

Vf = final velocity [m/s²]

Vo = initial velocity = 7.5 [m/s]

g = gravity acceleration = 9.81 [m/s²]

y = elevation = 27 [m]

\(v_{f}^{2} = - (7.5)^{2} +(2*9.81*27)\\ v_{f}^{2} = 473.5\\v_{f}=\sqrt{473.5}\\v_{f}=21.75[m/s]\)

Now using the following equation of kinematics, we can calculate the time that the fall lasts.

\(v_{f}=v_{o}+g*t\)

\(21.75 = -7.5 +9.81*t\\9.81*t = 29.25\\t = 2.98[s]\)

Answer: Yes it is true according o newton third law of motion

What is Newton Third Law of motion ?

--According to Newton's third law of motion, every action has an equal and opposite reaction.

--These two forces act on two different bodies.

-- Example,

1-  while swimming, you push the water backward. The water, in turn, pushes you forward.

--Similarly, while walking, you push the ground backward.

-- The ground then exerts a reaction force on you in the forward direction.

What is Newton Second Law of motion ?

--Newton's second law of motion states that “Force is equal to the rate of change of momentum.

--For a constant mass, force equals mass times acceleration.

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Answer:

To solve this problem, we need to use the coefficient of thermal expansion for gasoline, which tells us how much the volume of gasoline will increase as its temperature increases. The coefficient of thermal expansion for gasoline is approximately 950 x 10^-6 /°C.

Using this information, we can calculate the increase in volume of gasoline as it warms up from 15°C to 35°C:

ΔV = V * α * ΔT

where V is the initial volume of gasoline (60 L), α is the coefficient of thermal expansion for gasoline (950 x 10^-6 /°C), and ΔT is the change in temperature (20°C).

ΔV = 60 * 950 x 10^-6 * 20

ΔV = 0.114 L

Therefore, the amount of gasoline spilled as it warms up from 15°C to 35°C is:

60 L - 0.114 L = 59.886 L

Explanation:

So the answer is (A) 50.2 litre.

Answer:

His third law states that for every action (force) in nature there is an equal and opposite reaction. Explanation:

Answer:

His third law states that for every action (force) in nature there is an equal and opposite reaction

Explanation:

In other words, if object A exerts a force on object B, then object B also exerts an equal and opposite force on object A. Notice that the forces are exerted on different objects.

Answer: D. Potential energy

Explanation: science

Answer:

I believe D

Explanation:

Of course the manufacturer would most likely be biased to the product the have created, but the other sources would have no reason to. Hope this helps!

The car, which needs time after beginning to accelerate to move 3.5km, will take 100 seconds.

The car will move as it has traveled 3.50 km at 62.5 m/s.

Question A

Vi = car initial velocity

a = increase in velocity of the car per second

s = distance travelled by the accelerating car in time t

VF = velocity of the accelerating car at time t

Since acceleration is constant (accelerate forward uniformly from question), we will use kinematic equations.

Velocity Final = Vi + acceleration * time

s = Vi * t + 1/2 * acceleration * time²

Velocity Final² = Vi² + 2 * acceleration * distance (s)

Given from question

Vi = 7.5 m/s

a = 0.55 m/s²

s = 3.5km

t = ?

S = Vi * t + 1/2 * acceleration * time²

3500m = 7.5m/s * t + 1/2 * 0.55 * t²

0.55t² + 15t - 7000 = 0

We will use roots of a quadratic equation to find t

ax² + bx + c = 0

x = (-b ± (√b² - 4*ac)) / 2a

t = (-15 ± (√15² + 4 * 0.55 * 7000)) / 2 * 0.55

t = -15 ± 125 / 1.1

t = -140 / 1.1 ║t = 110 / 1.1

t = -127.27 ; 100

So, the equation of 0.55t² + 15t - 7000 = 0 is satisfied with two values of t = -127.27 & 100

Since, we are talking about time, we will eliminate minus value and we will use the positive value.

Therefore, the time needs to accelerate to move the car by 3.5km after the beginning is 100 seconds.

Question B

Given from question

S = 3.5km = 3500m

Velocity Final = ?

Velocity Final² = Vi² + 2*acceleration*distance (s)

Velocity Final² = 7.5² + 2 * 0.55 * 3500

Velocity Final² = 3,906.25

Velocity Final = 62.5m/s

Since we already found the accelerating car travelled 3500m in 100s. we could also use the other formula :
Velocity Final = Vi + acceleration * time

= 7.5 + (0.55*100)

= 62.5 m/s

Therefore, the car is moving 62.5m/s after traveled 3.50km.

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