why is steel from old cars not considered a renewwable resource even though it is used to make nwe steel products?

The required angle for the range of the projectile to be maximum is at an angle equal to 45°.

We know the horizontal range of the projectile as,

R = u² sin2θ/g

where,

R is range in metres

u is initial velocity in m/s

g is acceleration due to gravity in m/s²

The range of the projectile will be maximum when the angle is maximum.

So, sin 2θ should be maximum.

Sine angle has a maximum angle at its value equal to 1.

sin 2θ = 1

2θ = 90°

θ = 45°

Thus, the maximum range for a launched projectile is at angle equal to 45°.

The given question does not have any equation given. It is solved according to the basic information given.

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The force that the car move down the slope is 1.4 KN

The force, at right angles to the slope, exerted by the ground on the car​ is 7.7 kN

(a) The force with which the car tends to move down the slope is given by weight times the sine of the slope angle:

F = 8 000 N * sin(20°)

F = 1,366 N

(b) The force exerted by the ground on the car at right angles to the slope is given by weight times the cosine of the slope angle:

F = 8 000 N * cos(20°)

F = 7,679 N

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The visual presentation of the data helps us to understand the information better, because: it provides clearer data which easier for us to identify patterns, trends, and outliers, especially in super large data.

In presenting data from experiments, it is strongly recommended to use visual presentation, such as graphics, diagrams, pictures, etc. The advantages of using visual presentations are as follows:

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Answer:

through the use of a Gold leaf electroscope

At perihelion (closest approach to the Sun), objects move the fastest; at aphelion, they move the slowest. Since the orbits of the planets in the Solar System are almost circular.

As a result, the planet moves more quickly when it is closer to the Sun and less rapidly when it is farther away. As a planet travels around its orbit, its speed is continually changing. A planet moves most quickly when it is closest to the sun, and most slowly when it is further away (farthest). Law 3.

Because we are nearer the Sun at perihelion and more aware of its gravity, the precise speed changes. We are moving a little bit more quickly around the Sun than we were at aphelion because of this. Our overall orbital velocity, which varies with distance from the Sun, is the sum of our tangential and radial velocities.

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The final charge on the first capacitor is 7.20 μC and the final charge on the second capacitor is 12.00 μC.

The initial charge on the first capacitor, 1, can be calculated using the formula:

Q = C * V

where

Q is the charge,

C is the capacitance, and

V is the voltage.

Substituting the values, we get:

Q = 2.40 μF * 8.00 V = 19.2 μC

Let's call the final charge on the first capacitor 1,f and the final charge on the second capacitor 2,f.

Since the two capacitors are now connected in parallel, their equivalent capacitance is C_eq :

C_eq = C1 + C2

C_eq = 2.40 μF + 5.60 μF = 8.00 μF

The final charge on the equivalent capacitance is equal to the initial charge on the first capacitor, so:

Q_eq = Q1,f = 19.2 μC

From this, we can calculate the final charge on each capacitor:

Q1,f = (C1 / C_eq) * Q_eq

Q1,f = (2.40 μF / 8.00 μF) * 19.2 μC = 7.20 μC

Q2,f = (C2 / C_eq) * Q_eq

Q2,f = (5.60 μF / 8.00 μF) * 19.2 μC = 12.00 μC

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Explanation:

work = mgh

work= 80×10×1.25

w= 1000 joules

Answer:

800N

Explanation:

W=mg

where m=mass,g=acceleration due to gravity,W=weight

W=80×10

W=800N

An atomic nucleus emits an alpha particle (the helium nucleus), which causes it to change or "decay" into an other atomic nucleus with a mass number that is decreased by four and an atomic number that is reduced by two.

This process is known as alpha decay or -decay. In essence, alpha particles are helium nuclei that are bonded together by two protons and two neutrons. They are unable to penetrate as deeply as other particles like protons and electrons as a result of their enormous mass and electrical charge.

A positively charged particle similar to the helium-4 nucleus is spontaneously released during alpha decay.

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Therefore, 20 Coulombs of charge is transferred between points C and D of the circuit.

Potential difference, also known as voltage, is a measure of the electric potential energy per unit of charge in an electrical circuit. It is the force that drives the flow of electric charge through a circuit and is commonly expressed in volts (V).

The charge transferred can be calculated using the equation:

Q = W / V

Where Q denotes the charge transferred, W states the energy required, and V is the potential difference (30 Volts).

So, Q = 600 J / 30 V = 20 Coulombs.

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Answer:

1 km = .6214 mi

9.3E7 mi / .621 mi/km = 1.50E8 km

S = 1.5 * 10^8 km * 10^3 m / km = 1.5 * 10^11 meters

S = 1.5 * 10^11 meters

The weight of an object on Earth varies inversely as the square of its distance from the center of the Earth. This means that if the distance from the center of the Earth is doubled, the weight of the object will be reduced to one fourth of its original weight.

At sea level, the pilot weighs 175 lbs. If the pilot were to fly at a distance of 8800 kilometers above the Earth, their weight would be reduced to 150 lbs. This is because the distance from the center of the Earth is now 4 times the distance at sea level, which results in their weight being reduced to one fourth of its original value.

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When the TR and TC curves have the same slope, the firm is operating at its profit-maximizing output level, which allows the firm to earn the highest possible economic profit.

In microeconomics, the Total Revenue (TR) and Total Cost (TC) curves are important tools for understanding the behavior of firms in a competitive market. When the TR and TC curves have the same slope, the firm is said to be operating at its profit-maximizing output level. In this scenario, the firm earns the highest possible economic profit, which is the difference between total revenue and total cost.

To understand why the profit-maximizing output occurs when TR and TC curves have the same slope, we need to consider the following:

Marginal revenue (MR) is the additional revenue earned by a firm for selling one more unit of output. MR is equal to the slope of the TR curve.

Marginal cost (MC) is the additional cost incurred by a firm for producing one more unit of output. MC is equal to the slope of the TC curve.

The profit-maximizing output level occurs where MR = MC. At this output level, the additional revenue earned from selling one more unit of output (MR) is equal to the additional cost incurred from producing one more unit of output (MC).

When the TR and TC curves have the same slope, it means that MR = MC. This condition implies that the firm is operating at its profit-maximizing output level. At this output level, the firm earns the highest possible economic profit, which is the difference between total revenue and total cost.

If the slope of the TR curve is greater than the slope of the TC curve, then MR > MC, which means that the firm can increase its profit by producing and selling more output. Conversely, if the slope of the TC curve is greater than the slope of the TR curve, then MR < MC, which means that the firm can increase its profit by producing and selling less output.

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The amplitude and direction of the electric field, E, at any given position can be determined by taking into account a slight positive test charge.

In science, anything that possesses a both path and a magnitude is referred to as a vector. They are typically represented by pointing lines, the height of which denotes the size of the vector. In physics, a vector is a quantity with both direction and magnitude. It is often depicted by such an arrow whose height was proportional to the magnitude of the quantity but whose orientation is identical to that of the quantity. Despite having a size and a direction.

The definition of direction is the course that something follows or the course that must be followed to arrive .

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Newton's second equation of motion, which states that the net force acting on an item is equal to its mass times its acceleration, can be used to compare the acceleration of the two crates.

The only forces acting on both crates are the applied force, f, and the gravitational force, mg, where m is the mass of each container and g is the acceleration brought on by gravity. This is because both crates are resting on a frictionless surface.Crate A will suffer a greater net force and, thus, a greater acceleration than Crate B since the applied force, f, is being applied just to Crate A. Due to its greater mass, crate B's acceleration will be less. The following formula can be used to determine the two crates' acceleration: Where m is the mass of each container, an is equal to f / m.Crate A will move more quickly and Crate B will trail behind because Crate A's acceleration is larger than Crate B's acceleration.

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we can equate the two quantities of heat to find c: m_water * c_water * ΔT = m_material * c * ΔT, c = (m_water * c_water * ΔT) / (m_material * ΔT)

the above expression yields c = 0.20 kcal/kg * C°.

The formula for calculating the specific heat (c) of a material is:

ΔQ = m * c * ΔT

c = ΔQ / (m * ΔT)

ΔT = 100°C - 40°C = 60°C

m_water = 100 gΔQ = m_water * c_water * ΔT = 100 g * 1.00 kcal/kg * ΔT

m_material = 50 g

ΔT = 40°C - 0°C = 40°C

ΔQ = m_material * c * ΔT

So, we can equate the two quantities of heat to find c:

m_water * c_water * ΔT = m_material * c * ΔT

c = (m_water * c_water * ΔT) / (m_material * ΔT)

the above expression yields  temperature c = 0.20 kcal/kg * C°.

The first container's mass and temperature are multiplied together, and the result is added to the second container's mass and temperature to determine the mixture's water temperature. Finally, divide that outcome by the combined water masses in each container.

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The magnitude of road friction force that is needed to bring her car to a halt in 9.0 s is 1777.78N.

Mass (m) = 1000 kg.

initial speed (u) = 16 m/s.

time (t)= 9.0 Sec.

final speed (v) = 0 m/s.

F = ma

F=m[tex]\times (\frac{v-u}{t})[/tex]

a = [tex]\frac{v-u}{t}[/tex]

force is any action that tends to maintain, change, or distort a body's motion. Isaac Newton's three laws of motion, which are outlined in his Principia Mathematica, are frequently used to illustrate the concept of force. Newton's first law states that until a force is applied to a body, it will remain in either its resting or uniformly moving state in a straight path. According to the second law, when an external force acts on a body, the body accelerates in the force's direction. The amount of matter in the body is inversely proportional to the magnitude of the acceleration and directly related to the strength of the external force.

force (F)=  [tex]1000\times (\frac{0-16}{9})[/tex]=-1777.78N

The opposite force is indicated by the negative sign, which indicates this.

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Ions are generated when protons are gained or lost from the nucleus and are electrically charged. Choice (d)

Ions are charged particles that are created when an atom gains or loses one or more electrons. A charged atom or molecule is known as an ion. It is charged because the atom or molecule's number of protons and electrons is different. An atom becomes a negatively charged ion, or anion, when it gains one or more electrons. On the other hand, when an atom gains one or more electrons, it changes into a negatively charged cation or ion. The difference between the number of protons and electrons makes up an ion's charge.

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On Venus, it has rained nonstop for the past seven years. The rain destroyed thousands of forests, which then multiplied thousand times before being destroyed once more.

Seven years had passed since Venus had last seen rain. Several forests had been trampled by the rain, regrown a thousand times, and then trampled once more. No concrete evidence of past or existing life on Venus has been discovered as of yet.

Venus's severe surface temperatures, which can reach around , and atmospheric pressure that is  times that of Earth make it implausible that water-based life as we know it could exist there. The rocket people had gone to Venus, a planet with rain, to establish a civilization and live out their lives.

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Due to momentum conservation, energy from one marble is transferred into another marble when it collides with another marble.

At repose is the larger marble. The marble with a lower mass bounces off in the other direction following the contact. Moving in the same direction as the smaller stone is the larger one. If only one marble was able to strike the marbles in the line, then only one marble will shoot out the other end.

The initial momentum before the collision and the end momentum after the impact are equal, assuming an elastic collision. Momentum is preserved in a collision, as stated by Newton's third law of motion. That implies that what is put in must come out.

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The radio waves used in television transmissions.

Lower frequency electromagnetic waves than microwaves are radio waves.

Radio waves have wavelengths that range from tens of thousands of metres to 30 centimetres. These are equivalent to frequencies between 3 Hz and 1 GHz (109 Hz).

Straight-line radio-wave communication signals pass through the atmosphere, reflect off of clouds or ionosphere layers, or are transmitted by satellites in space.

They are utilised in remote-controlled toys as well as traditional broadcast radio and television, shortwave radio, navigation and air traffic control, and more.

Particularly, the wavelengths of television waves range from around 50 centimetres to about 10 metres.

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A plant receives 620 kw power at 3000 V from a power source via lines with a 3.0 total resistance.

The watt W is the SI unit of power, and 1 watts equals 1 joule per second (1W=1J/s). Power is the process by which energy is used up since power is an energy transfer. For instance, a 60-W bulb mieux J of energy every second.

Power is a metric for how quickly energy is transformed from one kind to the other. Energy spent over that time can be calculated by integrating, or adding, power over time. Using different units where power is stated as a rate may make the relationship between strength and power more obvious.

According to scientists, energy is the capacity .

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The 61.0 kg mass would need to be placed a distance of x = 0.147 m from the 570 kg mass to experience a net force of zero.

The net gravitational force between two masses can be calculated using Newton's law of gravitation:

F = G(m1 × m2) / r²

where:

F is the force,

G is the gravitational constant (G = 6.67 x 10⁻¹¹ Nm²/kg²),

m1 and m2 are the masses of the two objects,

r is the separation distance between the two objects.

The net gravitational force exerted by the 270 kg and 570 kg masses on a 61.0 kg mass placed midway between the two masses can be calculated as follows:

F1 = G (270 kg × 61.0 kg) / ((0.34 m / 2)²)

F2 = G (570 kg × 61.0 kg) / ((0.34 m / 2)²)

The net force would be equal to the sum of these two forces:

Fnet = F1 + F2

To find the position at which the 61.0 kg mass would experience a net force of zero, we need to find the position at which the force from the 270 kg mass is equal and opposite to the force from the 570 kg mass.

F1 = F2

G (270 kg × 61.0 kg) / (x²) = G (570 kg × 61.0 kg) / ((0.34 m - x)²)

Solving for x, we find that:

x = (0.34 m×(270 kg - 570 kg)) / (270 kg + 570 kg)

So, the 61.0 kg mass would need to be placed a distance of x = 0.147 m from the 570 kg mass to experience a net force of zero.

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The heavier car descends first because its rotational inertia (wheels) account for a greater proportion of its mass.

The roller coaster car's mass is unrelated to speed, so doubling the mass would have no impact on the speed of the vehicle. The car with twice the mass will therefore travel at the same speed from top to bottom.

The momentum of an object in motion is calculated by dividing its mass by its speed. An item has a lot of momentum if its mass or speed is greater than 1. A fast-moving car has more momentum than a slow-moving one because they have the same mass.

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The new voltage across the resistor in terms of [tex]V_r[/tex] is [tex]\frac{\sqrt\frac{5}{4} }{\sqrt2 }[/tex]

When referring to the "pressure" that propels electricity, voltage is utilized. Volts (V) are the unit of voltage. and higher voltages cause an electrical device to receive more electricity. However, because too high voltage could damage their circuitry, electrical devices must operate within a range of voltages. A voltage that is too low, on the other hand, can also be a problem since it inhibits circuits from operating and renders the devices built around them worthless. One needs to understand voltage and how to fix related issues in order to handle electronic equipment correctly and identify the underlying causes of issues when they occur.

fxed magnitude sinusoidal voltage. at 100hz, at 100Hz:

[tex]V_r[/tex]= [tex]\frac{V_in}{2}[/tex]

Using the voltage division formula we find that the transfer function is:

Resistor = R

Inductor = jωL

[tex]\frac{R}{R+j \times\omega L}[/tex]

we then equate the magnitude with [tex]\frac{1}{2}[/tex]

[tex]\frac{R}\sqrt{R^2+ (\omega L)^2}[/tex] = [tex]\frac{1}{2}[/tex]

next step assume R =1 and ωL = 1 above

that means that at 50Hz:

R =1 and ωL = .5

plugging into that formula we get [tex]\sqrt{(5/4)[/tex]  and [tex]\frac{\sqrt\frac{5}{4} }{\sqrt2 }[/tex] because this was in terms of [tex]V_in[/tex] not [tex]V_r[/tex].

so the answer is C.

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Question:

For the circuit shown, the supply Vin is a variable frequency, fixed magnitude sinusoidal voltage. At 100Hz, the voltage drop across the resistor is Vr and it equals the voltage across the inductor. If the frequency of Vin is reduced to 50Hz, what is the new voltage across the resistor in terms of Vr?

a.) square root of (5/8) * Vr

b.) square root of (2/3) * Vr

c.) square root of (8/5) * Vr

d.) square root of (3/2) * Vr

The minimum force or effort required to move the weight upward is 500 lbs.

option C.

The minimum force (applied in the direction of the red arrow) required to move the weight upward is determined by applying the formula for ideal mechanical advantage as shown below.

IMA = load / effort

from the number of pulleys, IMA = 2

Load = 1,000 lbs

The minimum force or effort required to move the weight upward is calculated as;

effort = load / IMA

effort = ( 1,000 lbs ) / 2

effort = 500 lbs

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A. The knowns in this problem are initial velocity, final velocity and acceleration due to gravity on the dolphin.

B. The calculated height the dolphin rises is not reasonable.

C. The time the dolphin stays in the air is calculated to be 1.48 s.

A. The initial velocity of the dolphin is given as vi = 14.5 m/s

The final velocity of the dolphin is zero.

As the dolphin jumps upwards, the gravity acting is considered negative

So, g = -9.8 m/s²

B. According to kinematics, we know the equation,

v² - u² = 2 a s

The height raised by the body of the dolphin is,

s = (v² - u²)/2a = -14.5²/(2× -9.8) = 10.73 m

The answer does not seem reasonable as it is approximately equal to three-storeyed building.

C. The time dolphin stays in the air is given by the equation,

v = u + a t

Here, a = -g

v - u = -g t

t = -(v - u)/g = -(0-14.5)/9.8 = 14.5/9.8 = 1.48 s.

The given question is incomplete. The complete question is 'A dolphin in an aquatic show jumps straight up out of the water at a velocity of 14.5 m/s.(a) List the knowns in this problem. (b) How high does his body rise above the water? To solve this part, first note that the final velocity is now a known, and identify its value. Then, identify the unknown and discuss how you chose the appropriate equation to solve for it. After choosing the equation, show your steps in solving for the unknown, checking units, and discuss whether the answer is reasonable. (c) How long a time is the dolphin in the air? Neglect any effects resulting from his size or orientation.'

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Considering the Gay-Lussac's law, the gas exerts at a pressure of 3.3 atmospheres at a temperature of 275 K.

Gay-Lussac's law states that the pressure of a gas is directly proportional to its temperature when the volume is constant. This is because as the temperature increases, the gas molecules move faster and therefore the number of collisions against the walls increases, that is, the pressure increases.

Mathematically, Gay-Lussac's law states that the ratio between pressure and temperature always has the same value:

P÷T= k

where:

Being 1 an initial state and 2 a final state, it is fulfilled:

P₁÷T₁= P₂÷T₂

In this case, you know:

Replacing in Gay-Lussac's law:

3.54 atm ÷295 K= P₂ ÷275 K

Solving:

(3.54 atm ÷295 K)× 275 K= P₂

3.3 atm= P₂

The final pressure is 3.3 atm.

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The toy car doesn't continue to move in a straight line at the same speed because there are several factors that cause it to slow down and eventually come to a stop.

Some of these factors are:

Friction: The friction between the floor and the tires of the toy car slows down the motion of the car. As the car rolls, the friction acts in the opposite direction to its motion and reduces its speed.

Air resistance: The air resistance also slows down the motion of the toy car. The faster the car moves, the greater the air resistance, which acts in the opposite direction to its motion.

Inertia: The tendency of an object to continue moving at the same velocity unless acted upon by an external force also plays a role in stopping the toy car. As the car slows down due to friction and air resistance, it gradually comes to a stop.

Imperfections in the floor: Unevenness in the floor, small bumps, or other imperfections can also cause the car to slow down and eventually stop.

All of these factors combined result in the toy car slowing down and eventually coming to a stop, rather than continuing to move in a straight line at the same speed.

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The mirror is a Concave mirror, the radius of curvature = 48.4 cm and the magnification is 2.25.

The field of physics known as optics is concerned with the behaviour and characteristics of light, including how it interacts with matter and how to build instruments that can either use or detect it.

Since the image is upright and larger than the object, we need a concave mirror.

We know image height, h/object height, h = -image distance, d'/object distance, d

h'/h = -d'/d

Using the real is a positive convention,

h'= + 48.1cm, h = + 21.3cm and d = + 13.2 cm.

48.1 cm/ 21.3 cm = -d'/+ 13.2cm

2 = -d'/12

d' = -29 cm

Using the mirror formula 1/d + 1/d' = 2/r where r = radius of curvature of the mirror

1/+13.2 + 1/-29 = 2/r

15.8 / 382.8 = 2 / r

r = ( 382.8 x  2 ) / 15.8

r = 48.4 cm

Magnification = image height, h'/object height,h

Magnification  = 48.1 / 21.3 = 2.25

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The answers include the following:

This is referred to as any source of potential damage, harm or adverse health effects on something or someone.

In the diagram given, we can see a car coming from behind and one in front which wants to enter the lane which makes them potential hazards as collision may occur which is why overspeeding shouldn't be encouraged to reduce the effect of anything happens.

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