when you go out to your car one cold winter morning you discover a 0.80- cm thick layer of ice on the windshield, which has an area of 1.2 m2 . if the temperature of the ice is -7.0 ∘c , and its density is 917 kg/m3 , find the heat required to melt all the ice.

Answer:

they are machined with shape characteristics which maximize the fatigue life of a metal.

Explanation:

they are highly polished to provide the surface characteristics which enable the best fatigue life.

To test a Zener diode with a digital multimeter, follow these steps:

1. Turn off the power supply to the circuit.

2. Set your multimeter to the diode test mode. This is usually represented by a diode symbol on the multimeter dial.

3. Connect the black probe of the multimeter to the cathode end of the Zener diode and the red probe to the anode end of the diode.

4. Check the voltage reading on the multimeter. If the voltage reading is zero, the Zener diode is not conducting and is faulty. If the voltage reading is close to the Zener voltage rating, the Zener diode is good.

5. Reverse the probes and repeat the test. The voltage reading should be close to zero volts. If the voltage reading is still close to the Zener voltage rating, the Zener diode is faulty.

Note: Be sure to consult the datasheet of the Zener diode you are testing to ensure that you are using the correct voltage rating.

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Answer:

f

Explanation:

The mass ratio which would be required to launch a single rocket into space in the most possible efficient way is that the ratio of rocket mass to fuel mass be; 1: 14.

According to the task content, it follows that the best single rockets made by humans have an initial to final mass ratio of about 15.

In essence, it follows that if the total mass initially was 15 mass units, the final mass would be 1 mass unit.

Consequently, 14 mass units must have burned as fuel in the rocket.

On this note, it follows that the mass ratio which would be required to launch a single rocket into space is; 15: 1 and this means there are 14 mass units of fuel for the 1 mass unit of actual rocket.

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The evidence that  would be used to support the claim that the squirrels are two separate species is that when placed together in pairs for study, no pair of Abert's squirrel and Kaibab squirrel result in offspring which is therefore denoted as option D.

This is referred to as a group of organisms that can reproduce with one another in nature and produce fertile offspring.

In this scenario we were told that Abert's squirrel and Kaibab squirrel may be separate species and the evidence which will support that is that no pair of Abert's squirrel and Kaibab squirrel result in offspring.

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Answer:light

Explanation:

The net flux Φ and the net charge q enclosed by the four Gaussian surfaces are summarized as follows:

Surface S1: The net flux Φ is positive and the net charge q enclosed is positive.

Surface S2: The net flux Φ is negative and the net charge q enclosed is negative.

Surface S3: The net flux Φ is zero and the net charge q enclosed is zero.

Surface S4: The net flux Φ is positive and the net charge q enclosed is positive.

The introduction of an enormous charge Q up close to surface S4 will change the pattern of the field lines, but it will not change the net flux through the four Gaussian surfaces since the enclosed charge remains the same.

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Answer:

The work required to stop a car of 1300 kg moving at a speed of 54 km/h is 8.1 kJ. This is calculated by multiplying the car's mass (1300 kg) by its speed (54 km/h) and then by the acceleration due to gravity (9.8 m/s2). Here is a Brainly link that can provide you with more information on calculating the work needed to stop a vehicle: https://brainly.com/question/3134150.

Answer:

1 mi = 5280 ft  * 12 in/ft = 63360 in

A convenient conversion factor (to remember) is 1 m = 39.37 in

63360 in / (39.37 in / m) = 1609.3 m

26 mi + 285 m = 26 * 1609.3 + 385 = 42,228 m

The length of a marathon run of 26 miles 385 yards is approximately 42,195 meters.

To convert the length of the marathon from miles and yards to meters, we need to first convert the miles to meters and then convert the yards to meters.

1 mile is equal to 1609.34 meters. Therefore, 26 miles is equal to 26 * 1609.34 = 42195.84 meters.

1 yard is equal to 0.9144 meters. Therefore, 385 yards is equal to 385 * 0.9144 = 351.1376 meters.

Adding the length in meters for both miles and yards gives us a total of 42195.84 + 351.1376 = 42547.9776 meters.

Rounded to three significant figures, the length of a marathon run of 26 miles 385 yards is approximately 42,196 meters.

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The possible hypothesis "different masses of objects fall to the ground at different rates" is a tenable hypothesis.

Thus, A reasonable explanation for an observation is a hypothesis. Every experiment begins with the formulation of a hypothesis. The experiment would now either support or refute the theory that has been proposed.

Remember that an experiment requires both an independent and a dependent variable. The dependent variable is the one that changes when the independent variable changes, but the independent variable is the one that we must keep manipulating.

In this situation, "different masses of objects fall to the ground at different rates" is a tenable hypothesis.

Thus, The possible hypothesis "different masses of objects fall to the ground at different rates" is a tenable hypothesis.

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Answer:

The speed is 1.35 m/s

Explanation:

(m1+m2) vi= m1+m2v2

(50+1.5) (3.5)=50 (5+v2) +1.5 v2

180.25= 250+ 51.5 v2

180.25- 250+ 51.5 v2

-69.75= 51.5 v2

v2= -1.35 m

a) the stress on the column392400 N/m²

b) the strain on the column is approximately 7.85 × 10⁻⁹.

(a) To find the stress within the column, we can use the formula:

Stress = Force / Cross-sectional area

Since Force = mass × acceleration due to gravity (F = m × g), we have:

Stress = (mass × g) / Cross-sectional area

Given mass = 32000 kg, g = 9.81 m/s² (approx.), and Cross-sectional area = 0.80 m², we get:

Stress = (32000 kg × 9.81 m/s²) / 0.80 m² ≈ 392400 N/m²

(b) To find the strain on the column, we use the formula:

Strain = Stress / Elastic modulus

Given Stress = 392400 N/m² and Elastic modulus for marble = 5.0 × 10¹⁰ N/m², we get:

Strain = 392400 N/m² / (5.0 × 10¹⁰ N/m²) ≈ 7.85 × 10⁻⁹

So the strain on the column is approximately 7.85 × 10⁻⁹.

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The maximum height travelled by the ball before returning to the ground is 8.62 m.

The maximum height travelled by the ball before returning to the ground is calculated by applying the following kinematic equation as shown below.

H = (u²sin²θ) / 2g

where;

H = (26² (sin 30)²) / (2 x 9.8)

H = 8.62 m

Thus, the maximum height travelled by a projectile depends on the initial velocity and angle of projection.

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The mass of the object would be approximately 18.8 kg in horizontal position.

We know that the net force acting on an object is equal to its mass times its acceleration, i.e., F = ma. In this problem, we are given the net force as a function of the object's position. We can use this information to find the acceleration of the object as a function of its position, and then use the kinematic equation relating displacement, initial velocity, acceleration, and time to find the mass of the object.

That the net force is given by F = 5x N, where x is the horizontal position of the object in meters. Since the force is constant with respect to position, we can use the equation F = ma to find the acceleration a as a function of x:

5x = ma

a = 5x/m

Now, we can use the kinematic equation relating displacement, initial velocity, acceleration, and time:

x = 1/2 at² + v₀t

where v₀ is the initial velocity of the object. We know that the object starts at rest, so v₀ = 0. We also know that after moving 6.0 m, the object has a speed of 4.0 m/s. We can use these values to solve for the time t it takes for the object to move 6.0 m:

6.0 m = 1/2 (5x/m) t²

t² = 2(6.0 m) m / (5x/m)

t = √(2(6.0 m) / (5/m)) = 1.94 s

Now, we can use the kinematic equation again to find the mass of the object:

x = 1/2 at²

6.0 m = 1/2 (5x/m) (1.94 s)²

m = 5x (1.94 s)² / (2*6.0 m)

m = 5(6.0 m) (1.94 s)² / (2*6.0 m)

m = 5(1.94 s)²/2

m = 18.8 kg

Therefore, the mass of the object is approximately 18.8 kg.

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The effect of weather and climate on the picture is erosion. The 3 potential solutions to the erosion are Planting of a cover crop, Build Terraces, and Create diversions to Help Drainage.

Erosion is defined as the washing away of the topmost portion of the soil which can occur due to natural causes or through the activities of man.

The natural causes of erosion is related to changes in weather and climate through rain, rivers, floods, lakes, and the ocean.

The three potential solutions to the problem of erosion include the following:

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Answer:

sorry

Explanation:

pls search on google

Use the dot product identity,

\(\vec x \cdot \vec y = \|\vec x\| \|\vec y\| \cos(\theta)\)

where \(\theta\) is the measure of the angle between the two vectors \(\vec x,\vec y\). Note that

\(\vec x \cdot \vec x = \|\vec\| \|\vec x\| \cos(0) = \|\vec x\|^2\)

Applying the identity to \(\vec x = \vec y = \vec A + \vec B\) and using the distributive and commutative properties of the dot product, we get

\((\vec A + \vec B) \cdot (\vec A + \vec B) = (\vec A \cdot \vec A) + 2 (\vec A \cdot \vec B) + (\vec B \cdot \vec B)\)

which is equivalent to

\(\|\vec A + \vec B\|^2 = \|\vec A\|^2 + 2\|\vec A\|\|\vec B\| \cos(\theta) + \|\vec B\|^2\)

Now, we're given \(\|\vec A\| = 13.9\), \(\|\vec B\| = 5.9\), and \(\theta=53^\circ\), so that

\(\|\vec A + \vec B\| = \sqrt{13.9^2 + 2\cdot13.9\cdot5.9\cos(53^\circ) + 5.9^2} \approx \boxed{18.1}\)

A neutral atom in the gas phase needs a certain amount of energy to have its electron removed before it may become ionized. This atom might be ionized by electromagnetic radiation with a maximum wavelength of \(8.06 \times 10^{-7} m\)

Using the formula \(\lambda = \frac{hc}{E}\), where h is Planck's constant \((6.62 \times 10^{-34} J s^{-1} )\) c is the speed of light \((2.998 \times 108 \frac{m}{s})\) And is the wavelength of the electromagnetic radiation, one may determine the largest wavelength of electromagnetic radiation that could ionize this atom.

We can determine the largest wavelength that can produce the ionization energy by rearranging the equation. Microwaves have the longest wavelength and the lowest frequency of the electromagnetic waves mentioned.

\(\lambda = \frac{hc}{E} = (6.62 \times 10^{-34} Js^{-1} ) \times (2.998 \times 10^{8} m/s) / (6.24 \times 10^{-19} J) = 8.06 \times 10^{-7} m\)

Therefore, The longest wavelength of electromagnetic energy that may ionize this atom is, hence, \(8.06 \times 10^{-7} m.\)

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She can use the information of redshift of a celestial body is to find the age and distance of the object.

'Red shift' is a critical idea for astronomers. The frequency of the light is increased, so the light is observed as moving towards the red side of the range.

Tabitha knows the redshift value of a particular celestial object. She uses this information to observe the consequence of the redshift.

Thus, the red shift value is used to determine the age and distance of the object.

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Answer:

A (the age and distance of the object)

Explanation:

125 J the kinetic energy possessed by a bullet of mass 10 Kg moving at a velocity of 25m/s.

Kinetic energy, which may be seen in the motion of an object, particle, or group of particles, is the electricity of motion. Any moving item uses kinetic energy, such as a person who walks, a baseball being thrown, a piece of food falling from a table, or a charged particle inside an electric field.

The capacity to perform work is unquestionably the most important characteristic of kinetic energy. Force acting on to an object while it is moving is referred to as work. Energy and work are convertible because of their tight relationship.

The kinetic energy of a body is

K.E. = 1/2 mv²

K.E. = 1/2 ×10 ×25

K.E. = 125 J

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Ender is a fictional character from the science fiction novel "Ender's Game" by Orson Scott Card. In the story, Ender is unable to return to Earth after completing his training as a military commander because he unknowingly destroyed an entire alien race, the Formics, whom he believed were a threat to humanity.

Ender's actions in the final battle were deemed necessary by the military leaders, but they also caused Ender great emotional and psychological distress. To protect him from public backlash and potential legal consequences, he was sent away from Earth to live in a colony on another planet. Additionally, the events of the story take place in the distant future where space travel and colonization of other planets have become commonplace, making it easier for people to live away from Earth.

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a) The scale would show an apparent weight of 961.0N  ; b) Scale would show an apparent weight of 435.8N.

Rate at which velocity of any object changes with time is called acceleration and it is vector quantity.

a. When the elevator starts to accelerate upwards at 3.0m/s², apparent weight of the person on scale will be:

Apparent weight = (mass of the person) x (acceleration due to gravity + acceleration of the elevator)

= 75kg x (9.81m/s² + 3.0m/s²)

= 75kg x 12.81m/s²

Apparent weight = 961.0N

Therefore, scale would show an apparent weight of 961.0N.

b. When the elevator starts to accelerate downwards at 4.0m/s², apparent weight of the person on the scale will be:

Apparent weight = (mass of the person) x (acceleration due to gravity - acceleration of the elevator)

= 75kg x (9.81m/s² - 4.0m/s²)

= 75kg x 5.81m/s²

Apparent weight = 435.8N

Therefore, scale would show an apparent weight of 435.8N.

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The specific heat capacity of the liquid is 2.51 x 10³ J/kg⁰C.

The specific heat capacity of the liquid is calculated as follows;

Q = mcΔФ

where;

c = Q/mΔФ

c = (65 x 120)/(0.78 x 3.99)

c = 2.51 x 10³ J/kg⁰C

The complete question is below:

An electrical resistor immersed in a liquid produces 65.0 W of electrical energy for 120 s. The mass of the liquid is 0.780 kg and its temperature increases from 18.55°C to 22.54°C. a) Find the average specific heat capacity of the liquid in this temperature range.

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The magnetic force on the wire, is 2.5 N.

The practical concern of this is that the magnetic force on the wire can cause motor effect.

The magnetic force at the given section of the wire, is calculated by applying the following equation.

F = BIL sinθ

where;

F = (5 x 10⁻⁵ x 1000 x 100) x sin(30)

F = 2.5 N

The practical concern of this is that the magnetic force on the wire can cause motor effect because it can interact with other magnetic field.

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The trip took approximately 11.74 hours.

​Given that the distance is 630 miles and the average speed is 53.6 mi/h, we can substitute these values into the formula. Using a calculator or performing the division, we find: Time≈11.74 hours. Time≈11.74hours
Therefore, the trip took approximately 11.74 hours.

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Answer:

The second law of thermodynamics states in an isolated system, the entropy (the amount of thermal energy that cannot be converted into mechanical work, also known as the amount of disorder) always increases, therefore, an isolated system always require an external input (new sources) of energy for there to be orderliness or for the available energy of the system to remain constant or increase

Explanation:

The statement "Hallow copies are sufficient for handling objects with only scalar member variables" is false.

What are scalar variables?

In computer programming, a scalar variable is a variable that contains only one value at a time. In other words, it is a variable that can hold a single number, character, or boolean value. The opposite of a scalar variable is an array or a data structure that can hold multiple values at once.

What are Hallow copies?

When a copy of an object is made in C++, there are two ways to do so: deep copy and shallow copy. Shallow copies are sometimes known as "hallow copies."Shallow copies are a type of copying in which only the pointer variables are copied, not the data items to which they point. A shallow copy of an object pointer simply copies the memory address of the original object. As a result, both the original object and the copy point to the same memory address. Therefore, the statement "Hallow copies are sufficient for handling objects with only scalar member variables" is false. Even if the object only contains scalar member variables, a shallow copy can cause issues. If two or more copies of an object are pointing to the same memory location, modifying one of them will result in the others being modified as well. As a result, a deep copy should be used to ensure that each copy of the object is distinct and independent of the others.

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The general equation of simple harmonic motion is

y = a cos (? t )or y = a sin (? t )

but here y = a cos (? t )...because at t=0 amplitude is maximum

Here amplitude 'a '= 0.01 m

m = 0.3 kg

x = 0.02 m

Force constant k is given by,

k = mg / x = 0.3 x 9.8/ 0.02 = 147 N/m

The time period of oscillation is given by ,

T = 2 ? ?( m / k )

? = 2 ? / T = ? ( 147 / 0.3 )

? = 22.1

then y = (0.01m) cos (22.1 t )

In physics, a force is a power that can change the motion of an item. A force can purpose an object with mass to alternate its pace. Pressure also can be described intuitively as a push or a pull. A force has both value and path, making it a vector quantity.

A pressure is a push or a pull and it affects our each day lives because without force, people might not be capable of open and near stuff or lift up our arms or legs.

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