Assuming an engine operates as a reversible heat engine calculate the outlet temperature (temperature of rejected heat) that achieves a thermal efficiency of 63% if the engine takes in heat at 640°C .

Answer:

The correct answer is option B, tenth

Explanation:

ASPIRE test is basically given by students of ninth and tenth grade as pre-test to the ACT test. ACT ASPIRE test can be given from third grade till tenth grade. The scoring obtained in this test helps the student, teachers and parents to monitor the preparation of their kids towards completing a successful ACT test.  

Apart from ninth and tenth grade , students belonging to lower grades (i.e from 3rd grade to 8th grade) can opt for online test.  However, higher grades can opt for both online and paper based test.

Students can take the Aspire test in the ninth and grade Tenth. The correct option is B.

The Aspire test is an assessment designed to measure students' readiness for college and careers. It evaluates their skills in English, math, reading, and science. The test is administered by the ACT organization and is typically taken by students in grades 3-10.

While students in ninth grade may be eligible to take the Aspire test, it is not the earliest grade at which it can be taken, and thus option A. First is not correct. The Aspire test is not typically administered to students in the first grade.

Option C. Eleventh and option D. Twelfth are not correct because by these grades, students may have already taken the ACT or SAT, which are the college entrance exams typically taken during the junior and senior years of high school.

Therefore, the correct option is B. Tenth, as this is the grade level at which most students take the Aspire test.

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Answer:

Centripetal force

Explanation:

The object that keeps an object in a circle is called uniform circular motion. In this type of motion, the distance covered by an object is equal to the circumference of the circle. The mathematical form of centripetal force is given by,

From second law of motion,

F = m × a

a is the centripetal acceleration

[tex]F=\dfrac{mv^2}{r}[/tex]

So, the correct option is (a) '' centripetal force''.

Answer:

5488 Joules

Explanation:

Use the formula for the potential energy:

[tex]E_p = mgh = 70kg\cdot 9.8\frac{m}{s^2}\cdot 8m = 5488 J[/tex]

Answer:

 Period = 1.67 seconds

 Frequency = 0.6 Hz

Explanation:

  Number of vibrations in 60 seconds = 36

  Frequency is defined as vibrations per second.

  So, Frequency = 36/60 = 0.6 Hz

  Time period is defines as time taken for 1 vibration,

 So, Time period = 60/36 = 1.67 seconds.

The period of vibration of a simple pendulum is 1.67 s.

The frequency of vibration of a simple pendulum is 0.6 Hz.

The frequency of vibration of a simple pendulum is the number of complete oscillation of the pendulum per second.

F = n/t

where;

F = 36/60

F = 0.6 Hz

The period of vibration is the inverse of frequency of vibration.

T = 1/f

T = 1/0.6

T = 1.67 s

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Answer:

1) Oxygen 2) So The Troposphere is a good place for planes to fly. 3)  [tex]CO_{2}[/tex] 4) It measures how tightly molecules are packed, It pushes molecules in one direction

Explanation:

1) Which gas in Earth’s atmosphere forms ozone?

Oxygen since Ozone is formed when [tex]O_{2} [/tex] receives Ultraviolet in its energetic form[tex] O_{3}[/tex], in a process called photolise.

2) Which characteristics describe the troposphere? Check all that apply.

This layer is the closest to the Earth although it is thicker in the Equator. Most planes fly in there.

So The Troposphere is a good place for planes to fly.

3) Which gas in Earth’s atmosphere has increased over time due to burning fossil fuels?

The outcome burning of fossil fuels is among other gases is the [tex]CO_{2}[/tex]

4) Which phrases describe air density?

Although these are not precise descriptions:

It measures how tightly molecules are packed The more density the more molecules are packed in given volume.

It pushes molecules in one direction, In a column of air the more the altitude the more molecules are pushed into the lower altitude region.

You haven't told us the "wattage" rating of the bulb.  We'll just have to call it ' W ' .

The bulb uses energy at the rate of W watts, or 0.001W kilowatts.

In 12 hours, it uses 0.012W kilowatt-hours of energy.

= = = = =

W watts = W Joules/second

1 hour = 3600 seconds

12 hours = (12 x 3600) seconds

Energy = (W Joule/sec) x (12 x 3600 sec)

Energy =  43,200W Joules

Final answer:

The energy used by a 100W incandescent bulb is 4,320,000 joules

Explanation:

Calculating Energy Use of an Incandescent Bulb

To calculate the energy used by an incandescent bulb left on for 12 hours, we need to know the power rating of the bulb. However, if we take a typical 100W incandescent bulb as an example, we can use the formula for electrical energy (Energy = Power *Time) to find out the energy consumption in watt-hours (Wh) and then convert it to joules (J). The power rating is usually mentioned on the bulb itself.

For a 100W bulb left on for 12 hours:

Energy in watt-hours = Power*Time

Energy in watt-hours = 100 W * 12 h = 1200 wh

Since 1 watt-hour is equal to 3600 joules,

Energy in joules == 4320000 J

Therefore, a 100W incandescent bulb uses 4320000 joules of energy when left on for 12 hours.

The answer is the velocity that is in a straight horizontal line.

The second one as the velocity doesn't change over time.

Answer: option B: Power is the rate at which work is done.

Explanation:

Power can be defined as the amount of work done or amount of energy transferred in a unit time.

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

Its unit is J/s.

SI unit of power is kg⋅m²⋅s⁻³

Hence, the best expression of power out of the given options is rate at which work is done. Option B is correct.

Given that:

                       mass of the ball (m) = 0.5 Kg ,

                    ball strikes the wall (v₁) = 5 m/s ,

rebounds in opposite direction (v₂) = 2 m/s,

                                time duration (t) = 0.01 s,

        Determine the force (F) = ?

We know that from Newton's II law,

                                F = m. a  Newtons  

                                  (velocity acting in opposite direction, so a = ( (v₁ + v₂)/t

                                   = m × (v₁ + v₂)/t

                                   = 0.5 × (5 + 2)/0.01

                                  = 350 N

The force acting up on the ball is 350 N

Alright well the Answer to your question is A). Screw

Hope this helps have a nice day : )

If u want i can explain why

Answer:

answer is screw my good fellow

Explanation:

A primary succession does not include any invasive species. This is true statement.

When a new piece of land is produced or is first exposed, primary succession occurs. This may occur, for instance, when lava solidifies and forms new rocks or when a glacier recedes and reveals bare rocks. In the initial succession, organisms have to start over. First, lichens may cling to rocks, followed by a few small plants capable of surviving without much soil. The term "pioneer species" refers to these.

More and larger plants start to colonize the region as a result of the decomposition of those plants, which gradually helps to create soil. Once sufficient soil has accumulated and sufficient nutrients are accessible, a climax community, such as a forest, is created. In the event that the site is disturbed after this, secondary succession takes place.

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Given that:

 Energy of bulb  (Work ) = 30 J,

 Time (t) = 3 sec

The power consumption =  ?

 We know that, Power can be defined as rate of doing work

              Power (P) = Work(Energy supplied) ÷ time

                               = 30 ÷ 3

                              = 10 Watts

The power consumption is 10 W.

To read and understand electrical blueprints, you need to be familiar with the various electric symbols used in the drawings.

Hence, the correct option is D.

These symbols represent different electrical components and devices, such as switches, outlets, lights, transformers, and more. Understanding these symbols is crucial for interpreting the layout and design of electrical systems in buildings and structures.

While having a background in electrical engineering (A) or knowledge of building construction (B) can certainly be helpful in interpreting electrical blueprints, the most critical aspect is understanding the meaning and representation of electric symbols (D) as they directly convey information about the electrical components and connections in a given system. Knowing how to sketch a plan view (C) is useful but is not specifically essential for reading electrical blueprints.

Therefore, To read and understand electrical blueprints, you need to be familiar with the various electric symbols used in the drawings.

Hence, the correct option is D.

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Final answer:

In order to encourage the star athlete to be more inclusive and supportive, start by acknowledging their talent and having a gentle conversation about their behavior. Emphasize the importance of teamwork and suggest activities to foster inclusivity.

Explanation:

To encourage the star athlete on your sports team to be more inclusive and supportive of all the players, you could have a dialogue with them. Start by acknowledging their talent and achievements and express your admiration for their skills. Then, gently bring up the issue of their behavior towards other players and explain how it affects team dynamics.

Next, emphasize the importance of teamwork and how their support can uplift and motivate other players. Share examples of successful teams that have thrived because of a positive and inclusive team culture. Encourage them to recognize and appreciate the strengths of their teammates.

Suggest activities or team-building exercises that can help foster inclusivity and encourage interactions among all team members. Additionally, remind them of the power of their influence as a star athlete and how they can set an example for others by embracing a supportive and inclusive attitude.

Answer:

3.99 kg

Explanation:

The period of a harmonic oscillator is given by:

[tex]T=2 \pi \sqrt{\frac{m}{k}}[/tex]

where

m is the mass attached to the spring

k is the spring constant

In this problem, we know:

k = 712 N/m

T = 0.47 s

Therefore, we can re-arrange the equation to find the mass that should be attached to the oscillator:

[tex]m=\frac{k T^2}{(2 \pi)^2}=\frac{(712 N/m)(0.47 s)^2}{(2 \pi)^2}=3.99 kg[/tex]

A mass of 3.97 kg should be attached.

The student asks what mass should be attached to a spring for a horizontal spring oscillator to oscillate with a period of 0.47 seconds, given the spring constant is 712 N/m and there is no friction. To find the mass, we use the formula for the period T of a simple harmonic oscillator: T = 2π√(m/k), where m is the mass in kilograms and k is the spring constant in newtons per meter. Rearranging the formula to solve for m gives us m = (T/(2π))2 × k.

Plugging in the given values:

Calculate (0.47 / (2π))2 = 0.005577... (rounded to nine decimal places).

Multiply this by the spring constant 712 N/m gives us 0.005577 × 712 = 3.970544 kg.

Therefore, the mass that should be attached to the spring is approximately 3.97 kg.

According to the experiments done and currently verified, in vacuum (this means there is not air or any fluid), all objects in free fall experience the same acceleration, which is the acceleration of gravity.  

Now, in this case we are on Earth, so the gravity value is [tex]9.8\frac{m}{s^{2}}[/tex]  

Note the objects experience the acceleration of gravity regardless of their mass.

Nevertheless, on Earth we have air, hence air resistance, so the afirmation "Free fall is a situation in which the only force acting upon an object is gravity" is not completely  true on Earth, unless the following condition is fulfiled:

If the air resistance is too small that we can approximate it to zero in the calculations, then in free fall the objects will accelerate downwards at [tex]9.8\frac{m}{s^{2}}[/tex] and hit the ground at approximately the same time.  

Two waves interfere when they run into each other.

The barrier reflects waves that run straight into it. It acts as a wave source and sends wave pulses back up the page towards the incoming waves.

Imagine a loose string tied to a wall. Someone sends two consecutive pulses along the string towards the wall. The first pulse gets reflected right away. It will travel backward towards the person holding the string. Along its way, it will run into the second pulse. The two pulses will interfere. The wall will make the reflected pulse out of phase with the second one. They will end up creating a destructive interference.

So is the case with the water waves running into the barrier. The barrier will send incoming waves back toward where they came from. Reflected waves interfere with incoming ones.

The impulse of the material point is equal to the product of mass and its velocity.

      The unit of measurement of the imouls is:

                                         [P] = [m] * [v] = kg * m / s.

Answer:

kg·m/s

Explanation:

The momentum of a body is calculated according to the following formula.

momentum = mass * velocity

Since the SI unit unit for mass is kilogram and the SI unit for velocity is metres/second then the multiplication of both will, algebraically give kg·m/s

The answer will be letter B.

Answer:

b

Explanation:

the box moves toward gina

Hi there,

the following injuries that include instability of the knee with pain and swelling is ACL Tear.

The ACL tear is common especially in sports like football one wrong move and you fall and tear your ACL

Hope this helped :)

Have a great day

Answer:

a = -.51 m/s²

coefficient of friction = .05

fk= 12.25 N

Explanation:

mass = 20 + 5kg

weight = 25kg ·9.8 = 245 N

There are many ways to do this I am sure but I did this:

1.  found a by using vf²=vi²-2aΔx. accel is - because it is slowing down.

started at 4.5 m/s, final = 0 and Δx=20....a=-.51 m/s²

2.  the force acting on the object is the friction force which has to equal the mass(accel).

-fk (going to left on free body diagram) = ma

-mu·n = ma

-mu·245N = 25 (-.51)

mu=.05

fk= .05(245N) = 12.25 N

The kinematics and Newton's second law allow to find the results for the questions of the movement of the child and the skateboard are:

  a) the deceleration is a = 0.51 m / s²

  b) The friction force is: fr = 12.75 N

  c) The friction coefficient is equal to: μ = 0.052

Given parameters

To find

    a) Acceleration.

    b) The friction force.

    c) The coefficient of friction.

a) Kinematics studies the movement of bodies, finding relationships between their position, speed and acceleration.

Since the child ends up at rest, his final velocity is zero (v = 0), let's use the relation.

       v² = v₀² - 2 a x

       0 = v₀² - 2ax

       a = [tex]\frac{v_o^2}{2x}[/tex]  

       a = [tex]\frac{4.5^2 }{2 \ 20}[/tex]

       a = 0.51 m / s²

b) Newton's second law states that the net force is proportional to the product of the mass and the acceleration of the body.

A free-body diagram in a diagram of the forces without the details of the body, in the attached we can see the free-body diagram of the system.

Let's write Newton's second law, since the boy and the scooter do not separate, we use the total mass.

y-axis

     N-W = 0

     N = W

     N = (M + m) g

     N = (20 +5) 9.8

     N = 245 N

x-axis

     fr = [tex]m_{total} \ a[/tex]  

     Fr = (20+ 5) 0.51

     fr = 12.75 N

c) Friction force is a macroscopic force of the interactions between the two surfaces and has the formula.

       fr = μ N

       μ = [tex]\frac{fr}{N}[/tex]

       μ = 12.75 / 245

       μ = 0.052

In conclusion, using kinematics and Newton's second law we can find the results for the questions of the movement of the boy and the skateboard are:

  a) The deceleration is a = 0.51 m / s²

  b) The friction force is: fr = 12.75 N

  c) The friction coefficient is equal to: μ = 0.052

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A. Formula: F=ma or F/m=a

10,000N/1,267kg≈7.9m/[tex]s^{2}[/tex]

B. Formula: a=[tex]\frac{V-V_{0} }{t}[/tex] and s=d/t

speed= 394.6/15

s=26.3m/s

a=[tex]\frac{26.3-0}{15}[/tex]

a=1.75m/[tex]s^{2}[/tex]

C. 7.9-1.75=difference of 6.15m/[tex]s^{2}[/tex]

D. The force that most likely caused this difference is friction forces

Answer:

Part a)

[tex]a = 7.89 m/s^2[/tex]

Part b)

[tex]a = 3.51 m/s^2[/tex]

Part c)

[tex]\Deltra a = 4.38 m/s^2[/tex]

Part d)

This difference in acceleration  is due to some frictional force on the surface.

Part e)

[tex]F_f = 5552.8 N[/tex]

Explanation:

Part a)

As we know by newton's II law

[tex]F = ma[/tex]

here we know that

[tex]m = 1267 kg[/tex]

[tex]F = 10,000 N[/tex]

Now we have

[tex]a = \frac{F}{m}[/tex]

[tex]a = \frac{10,000}{1267}[/tex]

[tex]a = 7.89 m/s^2[/tex]

Part b)

distance covered by the car

[tex]d = 394.6 m[/tex]

t = 15 s

now by kinematics we have

[tex]d = \frac{1}{2}at^2[/tex]

[tex]394.6 = \frac{1}{2}a(15^2)[/tex]

[tex]a = 3.51 m/s^2[/tex]

Part c)

Difference of acceleration is given as

[tex]\Delta a = a_{expected} - a_{real}[/tex]

[tex]\Delta a = 7.89 - 3.51 [/tex]

[tex]\Deltra a = 4.38 m/s^2[/tex]

Part d)

This difference in acceleration  is due to some frictional force on the surface.

Part e)

Now for magnitude of force is given as

[tex]F - F_f = ma[/tex]

[tex]10,000 - F_f = ma[/tex]

[tex]10,000 - F_f = 1267\times 3.51[/tex]

[tex]F_f = 5552.8 N[/tex]

Well, if there were no air resistance, then a helicopter couldn't fly.  But let's do the physics and the Math anyway:

The way gravity works, the speed of a falling object increases at the rate of 9.8 m/s every second.

So, after falling for 12 seconds, its speed is (12 x 9.8) = 117.6 m/s .

After 12 seconds of her jump from th helicopter, her velocity would be 117.6 m/s.

The second and third equations of motion are -

S = ut + 1/2 at²

v² - u² = 2aS

Given is a skydiver who jumps from a helicopter hovering at high altitude.

We can write -

[a] = 9.8 m/s²

[t] = 12 s

[u] = 0 m/s

Using the second equation of motion, we get -

S = ut + 1/2 at²

S = 1/2 at²

putting values -

S = 1/2 x 9.8 x 12 x 12

S = 705.6 m

Using the third equation of motion, we get -

v² - u² = 2aS

v² = 2aS

putting values -

v² = 2 x 9.8 x 705.6

v² = 13829.7

v = 117.6 m/s

Therefore, after the 12 seconds of her jump from the helicopter, her velocity would be 117.6 m/s.

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A.) Light waves can travel through a vacuum.

The answer is A, light waves eliminate

Nicolaus Copernicus

Nicolaus Copernicus  is the scientist who put forward a model which placed sun instead earth as the center of the universe

Answer:  The correct answer is "The food cooks inside the foil".

Explanation:

In conduction , there is no actual movement of matter. Heat flows from the hotter body to the colder body but when the two bodies are placed in contact with each other.

In convection, there is a physical movement of matter.

Radiation is the emission of the energy. Heat travels through a vacuum in the radiation.

In the given problem, Devon places sliced potatoes in a package of aluminum foil. He puts a metal grate over a campfire and sets the package on the grate.  

When he removes the foil package, the grate and foil are hot, and the food is cooked. Here, the heat is transferred from the campfire to the metal grate to the aluminium fire and then to the food. The metal grate and the aluminium foil are in contact with each other. Here, the conduction takes place.

Therefore, the scenario, "The food cooks inside the foil" represents the conduction from the given option.

Answer:

the food makes contact with the foil wich represents conduction so the answer is  A, hope this helps ( ;w;)

Explanation:

Answer:

The type of current described by the given statements is D.C. (or direct Current).

Explanation:

There are two different types of currents. They are Alternating Current (AC) and Direct current (DC) . Alternating current varies alternately, as the name suggests. DC is used for devices that need low voltage, like the chargers of a mobile phone. Domestic power supply is  AC .

The type of current described by these statements is direct current (DC).

The type of current described by these statements is direct current (DC). Direct current flows in one direction from the negative terminal to the positive terminal. It is commonly created by batteries. However, it is generally not found in U.S. electrical outlets, which typically provide alternating current (AC). Alternating current changes direction periodically.

Direct current (DC) is an electric current that flows consistently in one direction. In a DC circuit, electrons move from the negative terminal to the positive terminal of a voltage source, such as a battery. DC is used in many electronic devices while alternating current (AC) periodically changes direction and is typically used for power distribution.

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Given that:

time (t) = 20 s ,

        S = ?

We know that S = ut + 1/2 at²     meters

                       since free fall, a = g = 9.81 m/s² ; u =0 ;

                        S = 0 + 1/2 × 9.81 × 20²

                        S= 1962 m