If the average speed of a drag racing car is 0.05 miles per second, how long would it take the car to complete a 0.25 mile straight track?

Answer:

I think the answer is a because boiling water cleans it

Boiling the water away, leaving the substance behind in the beaker is the way to separate the mixture. The correct option is A.

A mixture is basically a substances comprised of two or many distinct chemical substances which are indeed not linked covalently.

A mixture is the usually physical combination of two or more substances that retain their identities as well as are mixed in the way to form solutions, suspensions, along with colloids.

When two or more distinct substances are physically combined, a mixture is formed that can be distinguished back into its original substances.

When two or more substances combine to form a new substance that cannot be separated back into its original substances, a chemical reaction occurs.

The mixture can be separated by boiling the water away and leaving the substance in the beaker.

Thus, the correct option is A.

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ok? EXPLAIN PLS

Explanation:

A comet with just an orbit last 200 years or less is referred to as a periodic and short-period comet, including Halley. Compared to long-period comet, whose orbits endure for thousands of years.

Correct option is, B.

An astronomical object in interstellar that isn't gravitationally connected to a star, such as an asteroid, comet, or rogue planet, is referred to as an interstellar object.

Comets are frozen remnants of the solar system's origin made of ice, rock, and dust. These can be several miles or tens of miles across, but when they approach it Sun, they heat it up and eject gases or dust into a luminous head that may be as big as a planet.

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Answer:

There is a lot of instruments used for measurement, may I ask which one are you referring to?

Kinetic energy is the energy possessed by a body as a result of its motion. Therefore, the kinetic energy of a 625-kg roller coaster car that is moving with a speed of 18.3 m/s is 104,640.625 J which is closest to option A, i.e., 127,575 J.

It is calculated by multiplying half of the mass of a body with the square of its velocity. The kinetic energy formula can be written as, KE = (1/2)mv2Where,KE is the kinetic energy of the body, m is the mass of the body, v is the velocity of the body. Now, let us apply the above formula to find the kinetic energy of the given roller coaster car whose mass is 625 kg and speed is 18.3 m/s.KE = (1/2)mv2KE = (1/2) x 625 x (18.3)2KE = (1/2) x 625 x 334.89KE = 104,640.625 J.

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Answer:

5N westward, acting on the student

Explanation:

Answer: 5N westward, acting on the student

Explanation:

Answer:

Explanation:

given data

ocv=0.6 V

Vmax= 0.52 v

J₀= 3.9*10⁻⁹

The power output of the solar cell = 627 watts

The efficiency of the solar cell = 4.6%

Given data :

Open circuit voltage ( Ocv ) = 0.60 V

Reverse saturation current density ( Io ) = 3.9 * 10⁻⁹ A/m²

Temperature of cell = 27°C

Cell voltage = 0.52 V

Cell area = 28m²

solar radiation = 485 w/m²

Step 1 : Determine the maximum power ( Pmax )

Pmax = \(\frac{e*v_{max}^{2} }{K*k+e*v_{max} } (I_{sc} + I_{0} )\)  ---- ( 1 )

where :  e = 1.602 * 10⁻¹⁹ ,  Vmax = 0.52 v,  Io = 3.9 * 10⁻⁹,  Isc = 46.51 A/m² ( calculated value ), K = 1.381 * 10⁻²³ , k = 300

Input values into equation ( 1 ) above

Pmax = 22.39 A/m²

Step 2 : Determine the output power ( Pout  )

Pinput = solar irradiation * cell area

                          = 485 * 28  = 13580 watts

Also

Pout =  Pmax * cell area

        = 22.39 * 28 = 627 watts ( power output )

Step 3 : determine the efficiency of the solar cell

efficiency of the solar cell  = Pout / Pin

                                            = 627 / 13580 = 0.046  = 4.6%

Hence we can conclude that The power output of the solar cell = 627 watts and The efficiency of the solar cell = 4.6%

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A moving thing has a tougher time stopping the more momentum it possesses. Because of this, stopping such an item would need more force or more time.

The force changes the object's velocity over the course of a specific period of time, which changes the object's momentum.

During a collision, an object is subjected to a force for a predetermined period of time, which causes a change in momentum. The mass of the item either accelerates or decelerates as a result of the force applied for the predetermined length of time. The object's change in momentum is equal to the impulse it experiences. The formula is F • t = m • v.

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By examining the influence of surface area and material composition on thermal energy transfer in a controlled experiment, we can gain valuable insights into the fundamental factors that affect heat exchange. This knowledge can have practical applications in fields such as engineering, materials science, and energy efficiency.

A good question about the variables that affect thermal energy transfer in a controlled experiment could be: How does the surface area and material composition of an object influence the rate of thermal energy transfer?

By focusing on the surface area and material composition, we can investigate how these two variables affect the transfer of thermal energy. The surface area of an object determines the amount of area available for heat exchange, potentially affecting the rate of energy transfer. The material composition, on the other hand, can impact factors such as thermal conductivity, specific heat capacity, and emissivity, all of which play a role in how effectively heat is transferred.

To conduct the experiment, you can select objects of different materials and surface areas, such as metal plates or plastic blocks with varying dimensions. By exposing them to a controlled heat source and measuring the temperature change over time, you can analyze how the chosen variables affect thermal energy transfer.

This investigation would provide insights into the fundamental factors that influence heat exchange and can be used to inform practical applications in various fields such as engineering, materials science, and energy efficiency.

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Answer: Option B

Explanation:

A experiment has many factors in it. It has a dependent variable, independent variable, control variable et cetera.

The independent variable as its name signifies is not dependent on any factors and is directly controlled by the experimenter.

The dependent variable is dependent on the change in the independent variable.

The dependent variable is actually the result of the experiment and is not manipulated.

Answer:

Analog and digital signals are the types of signals carrying information. The major difference between both signals is that the analog signals have continuous electrical signals, while digital signals have non-continuous electrical signals.

Explanation:

Analog Signals   were used in many systems to produce signals to carry information.  These signals are continuous in both values and time. The use of analog signals has been declined with the arrival of digital signals. In short, to understand the analog signals –  all signals that are natural or come naturally are analog signals.  Digital Signals , unlike analog signals, digital signals are not continuous, but signals are discrete in value and time. These signals are represented by binary numbers and consist of different voltage values.  Their differences are as follows:

Analog Signals                                      Digital Signals

Continuous signals                               Discrete signals

Represented by sine waves               Represented by square waves

The Human voice, natural sound, analog electronic devices are few examples   Computers, optical drives, and other electronic devices

A Continuous range of values            Discontinuous values

Records sound waves as they are     Converts into a binary waveform.

Only be used in analog devices.        Suited for digital electronics like computers, mobiles, and more.

I think a Digital signal is better.

Answer:

earthworm is classified as an annelid

Answer:

earthworm

Explanation:

Answer:

accelerating

Explanation:

untill an unbalanced force acting on a body, object at rest remain stationery while object on motion continue moving in constant velocity.

no resultant force means no acceleration.

Ice at 0 degrees celsius is mixed with water at 0 degrees celsius in a perfectly insulated calorimeter.what happens depends on the relative masses of ice and water,some of the ice will melt and the final temperature will be 0 degrees Celsius.So the correct options are 1,2 and 3.

The amount of ice that melts depends on the relative masses of ice and water. If there is more ice than water, then all of the ice will melt. If there is more water than ice, then some of the ice will remain. The final temperature will be 0 degrees Celsius regardless of how much ice melts.

Option 4 is incorrect because the water is already at 0 degrees Celsius, so it cannot freeze. Option 3 is incorrect because heat is not being transferred into or out of the system, so the temperature will not change.Therefore correct option are 1, 2 and 3.

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The wavelength of the radiation produced by a microwave oven operating at 2.10 GHz is approximately 14.3 centimeters, which is equivalent to 143 millimeters.

The wavelength of an electromagnetic wave can be calculated using the formula: wavelength = speed of light/frequency. In this case, the frequency is given as 2.10 GHz, which can be converted to hertz by multiplying by 10^9 (since 1 gigahertz = 10^9 hertz). So, the frequency becomes 2.10 × 10^9 Hz. The speed of light in a vacuum is approximately 3.00 × 10^8 meters per second. Using the formula mentioned earlier, we can calculate the wavelength as follows: wavelength = (3.00 × 10^8 m/s) / (2.10 × 10^9 Hz) Simplifying the equation, we find: wavelength ≈ 0.143 meters. To convert this to nanometers, we multiply by 10^9 since 1 meter is equal to 10^9 nanometers: wavelength ≈ 0.143 × 10^9 nanometers. These yields: wavelength ≈ 143 nanometers.

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Answer:

57.885.8 kg   weight of the container

Explanation:

The volume of the balloon * density of water = buoyant force of balloon

 volume of a sphere = 4/3 pi r^3

                                   = 4/3 pi * (1.5)^3 = 14.14 m^3   <===balloon volume

Now,   find the buoyant force on the container ALONE ....

             5.8 * 2.6 * 2.8  * 1027  = 43 364  kg   <=====  buoyant force

Now add the buoyant force of the balloon to find the weight

             43 364  +   14.14 * 1027 = 57885.8   kg

Answer:

\(a = \frac{v_{f} - v_{i}}{t} \\ = \frac{77 - 5}{8} = \frac{72}{8} \\ \boxed{a = 9 \: m. {sec}^{ - 2} }\)

80Sec or 1.33 min time taken by train to cross a bridge with a uniform speed of 36 kmph.

Given data,

length of bridge = 600m

length of train = 200m

Length of bridge + Length of train is the total distance travelled by train to cross the bridge.

So, 600+200 = 800m = 0.8km

Now, applying the formula for time,

\(time =\frac{distance}{speed}\)

\(time = \frac{0.8}{36}\)

time = 0.022hours

time in seconds= 0.022×60×60

time in seconds= 1.33×60

time in seconds= 80seconds

Therefore, 80Sec or 1.33 min time taken by train to cross a bridge with a uniform speed of 36 kmph.

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Answer: 0.8

Explanation:

The efficiency is defined as the ratio of total imput energy that is actually utilized to the end of the device.

So if we have a total transfer of 1500j of energy, and 1200j are used to heat the thing inside the kettle, 300j are not used to the actual function of the kettle.

So the efficiency is n = 1200j/1500j = 0.8

This means that a 80% of the energy imput is actually used to heat the kettle.

Therefore, the potential difference across the resistor drops over time as the capacitor charges up. The time constant of the circuit (R x C) determines the rate at which the capacitor charges and the voltage drop across the resistor decreases. After several time constants, the capacitor is fully charged and the voltage drop across the resistor is zero.

When an initially uncharged capacitor is charged in an RC circuit, the potential difference across the resistor drops over time as the capacitor charges up. In an RC circuit, a capacitor (C) and a resistor (R) are connected in series with a power source (typically a battery).When the switch is first closed, the capacitor is initially uncharged, and there is no voltage drop across it. Instead, the voltage source drives current through the resistor, which drops the full voltage of the source. As the capacitor charges up, however, its voltage rises. As a result, the voltage drop across the resistor decreases over time and the voltage drop across the capacitor increases until it reaches the same voltage as the source. At this point, the capacitor is fully charged and no current flows through the circuit.Therefore, the potential difference across the resistor drops over time as the capacitor charges up. The time constant of the circuit (R x C) determines the rate at which the capacitor charges and the voltage drop across the resistor decreases. After several time constants, the capacitor is fully charged and the voltage drop across the resistor is zero.

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Answer: Velocity = v = 35 m/s

Explanation:

Kinetic energy of an object is defined as the energy possess by an object due to its motion. Kinetic energy K.E of an object is equal to the half of the mass of that object multiplied by square of the object's velocity.

Mathematically,

v = 35 m/s

This question can be solved by using the equations of motion.

a) The initial speed of the arrow is was "9.81 m/s".

b) It took the arrow "1.13 s" to reach a height of 17.5 m.

a)

We will use the second equation of motion to find out the initial speed of the arrow.

\(h= v_it + \frac{1}{2}gt^2\\\)

where,

vi = initial speed = ?

h = height = 35 m

t = time interval = 2 s

g = acceleration due to gravity = 9.81 m/s²

Therefore,

\(35\ m = (v_i)(2\ s)+\frac{1}{2}(9.81\ m/s^2)(2\ s)^2\\\\v_i(2\ s)=19.62\ m\\\\v_i = \frac{19.62\ m}{2\ s}\)

vi =  9.81 m/s

b)

To find the time taken by the arrow to reach 17.5 m, we will use the second equation of motion again.

\(h= v_it + \frac{1}{2}gt^2\\\)

where,

g = acceleration due to gravity = 9.81 m/s²

h = height = 17.5 m

vi = initial speed = 9.81 m/s

t = time = ?

Therefore,

\(17.5 = (9.81)t+\frac{1}{2}(9.81)t^2\\4.905t^2+9.81t-17.5=0\)

solving this quadratic equation using the quadratic formula, we get:

t = -3.13 s (OR) t = 1.13 s

Since time can not have a negative value.

Therefore,

t = 1.13 s

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The attached picture shows the equations of motion in the horizontal and vertical directions.

La energía no se crea ni se destruye solo se transforma

Explanation:

espero y te ayude

A 1200- kg car can round a turn of radius 85.0 m on a flat road if the coefficient of friction between tires and road is 0.50,the maximum speed at which the car can round the turn without skidding is approximately 26.0 m/s (or 26 m/s to two significant figures).

To find the maximum speed at which the car can round the turn without skidding, we can use the concept of centripetal force.

The maximum centripetal force that can be provided by the friction force between the tires and the road is given by:

Friction force = Centripetal force

The friction force can be calculated using the equation:

Friction force = coefficient of friction × Normal force

The normal force is the force exerted by the surface perpendicular to it, which is equal to the weight of the car (mg) in this case:

Normal force = mass ×gravity

The centripetal force is given by:

Centripetal force = mass × (velocity^2 / radius)

Setting the friction force equal to the centripetal force, we can solve for the maximum velocity:

coefficient of friction × Normal force = mass × (velocity^2 / radius)

Plugging in the values:

0.50 × (mass × gravity) = mass × (velocity^2 / radius)

Simplifying:

0.50 × mass × gravity = mass × (velocity^2 / radius)

Canceling out the mass:

0.50 × gravity = velocity^2 / radius

Solving for velocity:

velocity^2 = 0.50 × gravity × radius

velocity = sqrt(0.50 × gravity * radius)

Plugging in the values:

velocity = sqrt(0.50 ×9.8 m/s^2 ×85.0 m)

Calculating:

velocity ≈ 26.0 m/s

Therefore, the maximum speed at which the car can round the turn without skidding is approximately 26.0 m/s (or 26 m/s to two significant figures).

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The speed of object A at the end of the ramp is approximately 25.39 m/s.

Part (a) The two objects, A (solid cylinder) and B (hollow cylinder), will reach the bottom of the ramp at the same time.

The time it takes for an object to reach the bottom of a ramp depends on its mass distribution and shape, not on whether it is solid or hollow.

In the absence of any other information, we can assume that both objects have similar mass distributions and roll without slipping, resulting in them reaching the bottom of the ramp simultaneously.

Therefore, the answer is 3) They will reach the bottom at the same time.

Part (b) To calculate the speed of object A at the end of the ramp, we can use the principle of conservation of energy.

The potential energy at the beginning of the ramp is converted into kinetic energy at the bottom of the ramp.

The potential energy (PE) at the beginning of the ramp is given by:

PE = m * g * h

where m is the mass of object A, g is the acceleration due to gravity, and h is the height of the beginning of the ramp.

Mass of object A (m) = 340 g = 0.34 kg

Radius of object A (r) = 31 cm = 0.31 m

Height of the beginning of the ramp (h) = 41 cm = 0.41 m

Acceleration due to gravity (g) = 9.8 m/s²

The potential energy at the beginning of the ramp is:

PE = 0.34 kg * 9.8 m/s² * 0.41 m

PE ≈ 1.375 J

At the bottom of the ramp, the potential energy is fully converted into kinetic energy:

KE = 1/2 * I * ω²

where I is the moment of inertia of the object and ω is the angular velocity.

For a solid cylinder, the moment of inertia is given by:

I = (1/2) * m * r²

Substituting the given values:

I = (1/2) * 0.34 kg * (0.31 m)²

I ≈ 0.0169 kg·m²

Since the object rolls without slipping, the linear speed (v) can be related to the angular velocity (ω) by the equation:

v = ω * r

Solving for ω:

ω = v / r

The linear speed at the end of the ramp is equal to the radius times the angular velocity.

Substituting the values:

v = (1.375 J / 0.0169 kg·m²) * 0.31 m

v ≈ 25.39 m/s

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Answer:

The spring constant is approximately 2.84 N/m

Explanation:

The height of the building, h = 828 m

The mass of the billionaire that has an office on the top floor, m = 120 kg

Gravitational potential energy, P.E. = m·g·h

Where;

g = The acceleration due to gravity ≈ 9.81 m/s²

The gravitational potential energy of the billionaire at the top floor is therefore;

P.E. of billionaire at top floor = 120 kg × 9.81 m/s² × 828 m  = 974,721.6 J

The elastic potential energy of the spring, \(P.E._{spring}\) is given as follows;

\(P.E._{spring} = \dfrac{1}{2} \cdot k \cdot h^2\)

Where;

k = The spring constant of the spring in N/m

h = The extension of the spring = The height of the building = 828 m

Given that the energy of the spring is conserved, we have;

\(P.E._{spring}\) = P.E. of billionaire = 974,721.6 J

Plugging in the values gives;

\(P.E._{spring} = 974,721.6 \ J = \dfrac{1}{2} \times k \times (828 \ m)^2\)

Therefore;

2*974,721.6/(828^2)

\(k = \dfrac{2 \times 974,721.6 \ J}{(828 \ m)^2} \approx 2.84 \ N/m\)

The spring constant, k ≈ 2.84 N/m.

Answer:

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