Four students each conduct a different experiment. Which student experiment represents an endothermic chemical reaction? Student 1 Student 2 Student 3 Student 4 The student mixes barium hydroxide (powder) with ammonium chloride (powder), and the temperature drops below freezing The student dilutes baking soda and vinegar, heats it on a hot plate, and then cools it. The student touches the surface of the substance with a stirring rod, and it crystallizes immediately. The student pours hydrogen peroxide into a bottle and then adds detergent. The student then adds yeast. The substance begins to foam up, and the bottle feels warm. The student combines calcium oxide and water to generate heat. The heat is used to boil an egg​

The speed of the person when the parachute is deployed in ft/s is calculated to be 135.6 ft/s.

The forces influencing the mass m skydiver at any particular time are:

i) Fg = mg j

ii) FR = -k v

As demonstrated in the following diagram provided in the attachment, we have taken a reference with its origin at the point the movement starts and the positive y axis along the direction of the movement (vertically down).

Writing down Newton's equation, we have:

ΣFi = FR + Fg = m a

Considering that the movement occurs on the y-axis, dropping the vector notation and replacing it with the modular values of FR and Fg, with the signs in accordance with the elected reference frame, we have:

m a = m dv/dt = m g - k v ----(1)

Before the parachute is deployed, ρ₁ m = 0.15 s⁻¹. The velocity in this regime is labeled v₁.

After the parachute is deployed, ρ₂ m = 1.3 s⁻¹. The velocity in this regime is labeled v₂.

Let's solve equation (1) in the first regime. The following is the complete solution for the velocity as a function of time:

v(t) = v 1h(t) + v 1p(t)

This is the result of adding the homogeneous equation's solution to one specific in-homogeneous equation's solution. Given, k = ρ₁ m and arranging equation (1), we have:

dv₁/dt + ρ₁ v₁ = g

The homogeneous equation takes the following form:

dv₁/dt + ρ₁ v₁ = 0

The solution is then written:

v 1h = C e^(ρ₁ t), where C is an arbitrary constant.

The inhomogeneous equation has the following specific solution:

v 1p = g/ρ₁

This can be checked by direct substitution. Let's enforce the initial condition v₁(0) = 0 (the man starts the fall without initial velocity) to determine the constant C:

C = g/ρ₁ ⇒ v(t) = g/ρ₁ [1 - e^(ρ₁ t)]

The second initial condition is y(0) = 0 and is only necessary to determine the position as a function of time. Substituting, we get:

v₁ (7) = 135.6 ft/s

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A collision will occur when two skaters, each weighing 50 kg, are moving parallel to one another on ice and are 3.0 metres apart.

The speed at which the skaters were moving before colliding and the type of collision determine how it will turn out (e.g. elastic or inelastic) The whole kinetic energy of the two skaters is conserved in an elastic collision, which means that the total energy before and after the impact are equal.

In this scenario, the speed of the skaters after the collision will differ from their speed prior to the impact, but their overall kinetic energy won't change. Some of the system's kinetic energy is changed into other energy during an inelastic collision.

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Correct Question:

What happened when two skaters, each of mass 50 kg, slide on ice toward each other along parallel paths separated by 3.0 meters.

A short roadway by which vehicles may leave a major highway.

List and define the following two sections of an exit ramp: The Deceleration Lane —— provides the motorist with the necessary time and space to adapt his or her vehicle’s speed to the slower posted ramp speed without interfering with the flow of traffic on the expressway. The Exit Ramp —— permits vehicles to enter an adjacent highway.

Southbound traffic to the expressway’s terminus was forced onto the exit ramp. It now has a southbound exit ramp as well as a northbound entry ramp. There are toll gates on both the southbound departure ramp and the northbound entry ramp. To the left is the exit ramp.

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Answer:

In projectile motion, the velocity along the x-axis is constant.

Explanation:

In case of projectile motion the vertical component of particle's velocity changes continuously because of the force acting in vertical direction which is its own weight.

But in the horizontal direction as there is no force acting on the object; therefore its horizontal velocity remains constant.

The speed of the command module after the separation can be calculated using the conservation of momentum which is 3920km/h.

Since the motor is four times the mass of the command module, the total momentum of the system before the separation is

4×4000 km/h. After the separation, the motor has a momentum of 80 km/h and the command module has a momentum equal to the total initial momentum minus the momentum of the motor. Therefore, the speed of the command module is

4×4000 km/h - 80 km/h = 3,920 km/h.

Thus, the speed of the command module after the separation is 3,920 km/h.

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7.53* 10²⁰ is the answer. Keq is an equation's representation of the equilibrium constant. If Keq is more than 1, this indicates that the product concentrations are higher than the reactant concentrations.

If Keq is less than 1, the reactant and product concentrations are out of balance. also see free energy and chemical equilibrium. The ratio of the molar concentrations of the reactants to those of the products, each concentration term raised to a power equal to the stoichiometric coefficient in the balanced chemical reaction, can be used to calculate the equilibrium constant. ΔG° = ΔH° - TΔS°

ΔG° = (-98.2 × 1000 J) - [(273 + 25) K] × (70.1 J/K)

= -119100 J

ΔG° = -RT ln(K) = [-8.314 J / (mol K)]

= -119100 J × [(273 + 25) K] ln(K)

= 48.07 K

= e48 07 K

= 7.53* 10²⁰

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The equation TC + or - WCA = TH is correct among the given equations. The option A is correct.

These given equations are regarding the magnetic compass errors.

Now, let us see the full form of the given above equation.

First Letter

T = concerning TRUE North (use plotter and latitude)

M = Regarding MAGNETIC North (True North +/- Deviation)

C = refers to the COMPASS North (Magnetic North +/- Compass card deviation) system

Second Letter

C = Plotted COURSE on the map (no wind correction applied)

H = Aircraft's HEADING after applying wind correction (Course +/- Wind Correction Angle)

Normal Order

TC = True course

VAR = Variation

MC = Magnetic course

WCA = Wind correction angle

MH = Magnetic heading

DEV = Deviation

CH = Compass heading

So, the above correct equation means that, True Course + or - Wind correction angle = True heading

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Because of shorter wavelength, Blue light would release electrons with more kinetic energy. Yellow light would generate more electrons.

Blue and yellow light must have different intensities for the yellow light to emit electrons with more kinetic energy.

The yellow light must be more intense than the blue light since both lasers send the same amount of energy to the metal surface. The yellow light must therefore produce more electrons.

The expelled electrons must have a higher kinetic energy since the wavelength of blue light is shorter.

It is demonstrated by the photoelectric effect that light can behave like a particle. When photons are shone on a metal surface, electrons are expelled from the surface of the metal, which causes the photoelectric effect.

When compared to green light, the higher energy blue light ejects electrons with more kinetic energy.

No electrons are released by light below a specific frequency. In contrast, light exceeding that threshold frequency can emit electrons even at modest intensities. Electron ejection speed appears to be frequency dependent, with an increase in frequency resulting in an increase in speed.

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a. The water level on a beach wall can be modeled by the equation d(t)=6+4cos(π/6.t - π/3). The graph of this equation represents the water level variation over time, with t being the number of hours after midnight.

b. The graph is a sinusoidal wave with a maximum height of 10 meters and minimum height of 2 meters.

c. The earliest time at which the water is at its highest is 12:00 p.m. at which point d(t) = 10. The average rate of change of the depth of the water with respect to time between 3 a.m. and 9 a.m. is zero, as the water level is at its minimum during this time period. d. The rate of change of the water level with respect to time at any point t is given by the derivative of the function d(t), which is -4π/6 sin(π/6.t - π/3).

e. The magnitude of this rate of change reaches its maximum value of 4π/6 = 2.094 m/hr at times t = (3nπ + π/3)/(π/6), where n is an integer. The equation maximum value of the magnitude of the rate of change is 2.094 m/hr, and the water level is changing fastest at these times.

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The ancient Greek sporting festival known as the Olympic Games was recreated in the late 19th century.

Prior to the 1970s, the Games were only officially open to athletes with amateur status; however, in the 1980s, many events were made available to athletes with professional status.

The Games are currently accessible to everyone, including the best professional basketball players and football players (soccer). Several of the sports that are now a part of the Summer Games schedule, which at times has featured competitions in as many as 32 sports, were part of the ancient Olympic Games.

The Winter Games were approved for winter sports in 1924. The Olympic Games are now regarded as the top sporting event in the globe.

Therefore, The ancient Greek sporting festival known as the Olympic Games was recreated in the late 19th century.

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The capacitance of 370 uF refers to the electrical storage capacity of a capacitor.

Capacitance is a measure of a capacitor's ability to store electrical charge. It is defined as the ratio of the amount of electrical charge stored on a capacitor to the potential difference (voltage) across its plates. The unit of capacitance is the Farad (F), but in practice, capacitors are often rated in microfarads (uF), which is one millionth of a Farad.

In this case, a capacitance of 370 uF means that the capacitor can store a total charge of 370 microcoulombs (uC) when the potential difference across its plates is 1 Volt. The capacitance value determines the amount of charge that a capacitor can store and, in turn, affects the behavior of circuits in which the capacitor is used.

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The block is submerged in water in this instance, so normal force won't apply. The remaining forces will continue to impact the block.

Contact with a solid surface will always result in a normal or reaction force. The block is submerged in water in this instance, so normal force won't apply. The remaining forces will continue to affect the block: - Pressure force coming from the block's four sides ( which will sum up to 0) buoyancy force moving upward weight force acting downward.

When an object enters water, two forces are at work on it: buoyancy, an upward force, and gravity, a downward force. The force of gravity pulling an object downward is measured by the object's weight. The buoyant force is present regardless of whether the object is floating or submerged in the fluid, and its strength is determined by the amount of fluid that the object displaces.

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The Acceleration is a=3.37 m/[tex]s^2[/tex], the time required to travel the 160 m is t=3.86s, the distance moved from rest to the time the train had a speed of 35 m/s.m is  d=182m

The measurement of distance is the separation between two objects or points, and it can be quantitative or occasionally qualitative. In physics, the term "distance" can refer to a physical length or, in common parlance, to an estimate based on other considerations (e.g. "two counties over").

[tex]V_{f} =[/tex]48m/s

d=160m

apply the equation

[tex]V_{f} ^2=V_{f} ^2+2as\\[/tex]

[tex]48^2=35^2+2a\times160[/tex]

2304=1225+320a

1079=320a

a=3.37 m/[tex]s^2[/tex]

b)  [tex]V_{i} =[/tex]35m/s

[tex]V_{f} =[/tex]48m/s

a=3.37 m/[tex]s^2[/tex]

Apply the equation [tex]V_{f} =V_{i} +at[/tex]

48=35+3.37 x t

t=3.86s

c) -   [tex]V_{i} =[/tex]0m/s

[tex]V_{f} =[/tex]35m/s

a=3.37 m/[tex]s^2[/tex]

Apply the equation [tex]V_{f} =V_{i} +at[/tex]

35=0+3.37 x t

t=10.4s

d)-   [tex]V_{i} =[/tex]0m/s

[tex]V_{f} =[/tex]35m/s

a=3.37 m/[tex]s^2[/tex]

Apply the equation [tex]V_{f} ^2=V_{f} ^2+2as\\[/tex]

[tex]35^2=0+2\times3.37\times d\\[/tex]

1225=63.74d

d=182m

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Explanation:

When a surface is submerged in a fluid, the resultant pressure force on the body acts perpendicular to the surface in all directions. This is known as hydrostatic pressure. The pressure at a particular point in a fluid is the same in all directions and is directly proportional to the fluid's density and the depth of the point below the surface of the fluid. As the depth increases, the pressure also increases. The pressure at any point in a fluid is exerted in all directions, so it is a scalar quantity.

This pressure is defined as the force exerted per unit area, and it is determined by the weight of the fluid above the point of interest. The pressure at a point in the fluid is the same in all directions, so it is called an isotropic property of fluid

Scientist’s work is supported by this observation. The correct answer is : d. Aristotle

Which scientist’s work is supported by this observation?

Aristotle's work in physics is supported by this observation, as he proposed that heavier objects fall faster than lighter objects. Since both the large and small branches take the same amount of time to fall to the ground, it indicates that the weight of the branches does not affect the time it takes for them to fall. This supports Aristotle's theory that the speed of falling objects is independent of their weight. Aristotle proposed that objects fall at a constant speed regardless of their weight. This is due to the fact that the force of gravity is constant and it accelerates all objects at the same rate.

This is why both the large and small branches take the same amount of time to fall to the ground.

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Answer:

Why can no one eve give a correct answer

the real answer is Galileo

Explanation:

Only normal acceleration occurs in a uniform circular motion, and it moves in the direction of the center. Tangential acceleration is equal to zero.

A particular kind of motion in which an object moves in a circle at a fixed speed is known as uniform circular motion. Any point on a propeller, for instance, that is rotating at a consistent speed is doing uniform circular motion.

Two properties let us recognize a particle moving uniformly in circles: It travels in a circle with a radius of r and moves at a constant speed v. The particle's acceleration is then radially pointed toward the center of the circular path and has a magnitude of v2/r.

The weight of the toy is: m = 1 k g

The circle's diameter is r = 1.5 meters.

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The maximum possible magnitude of the electrostatic force between those two parts is calculated to be 7.19 × 10¹⁵ N.

The electrostatic force expression is as follows:

F = k Q q/r²

where,

Q, q are charges

k is Coulomb's constant

r is the separation between charges

In this problem, Q = q = 5.9/2 = 2.95 C

Separation is given as 3.3 mm = 3.3 × 10⁻³ m

The value of k is 9 × 10⁹ N m²/C².

After plugging the values into the equation above, we have,

F = k Q q/r² = (9 × 10⁹ ×2.95 × 2.95)/(3.3 × 10⁻³)² = (78.33× 10⁹)/(10.89 × 10⁻⁶) = 7.19 × 10¹⁵ N

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The magnitude of the acceleration of the ball during the collision was 1200m/s^2

The magnitude of acceleration of the ball during the collision can be calculated using the following equation:

a = Δv / Δt

Where Δv is the change in velocity and Δt is the change in time.

In this case, Δv = 26 m/s - 23 m/s = 3 m/s and Δt = 2.5 ms = 0.0025 s.

Substituting these values, we get:

a = 3 m/s / 0.0025 s = 1200 m/s^2

So, the magnitude of the acceleration of the ball during the collision was 1200m/s^2.

The magnitude of acceleration is a scalar quantity that represents the rate of change of velocity of an object, usually measured in meters per second squared (m/s^2).

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In the ancient world, the geocentric Ptolemaic theory served as the standard for cosmology. According to this theory, the Earth was at the centre of the cosmos and that every other celestial body rotated around it.

However, Galileo Galilei's telescopic findings made with his recently developed telescope presented multiple problems with this idea.

1. Venus' phases. Galileo noted that Venus cycled through phases resembling those of the Moon, which could only be true if Venus rotated around the Sun and not the Earth.

2. Galileo discovered that Jupiter has four moons that orbit the planet, which disproved the notion that all celestial bodies revolve around the Earth.

3. Galileo noticed that the Moon had mountains and craters, which called into question the notion that it was a perfect sphere that remained unchanged across time.

4. The Sunspots: Galileo discovered that the Sun's spots evolved through time, altering in size and shape, which cast doubt on the notion that the Sun was a perfect, immutable celestial body.

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Depending on the substance, current and voltage have different relationships. You see, an object conducts current when a specific voltage is applied between two locations on it.

What is the connection between voltage (V) and current (I)?

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To solve the given differential equation with the given initial condition, you can use the Euler's method with two steps and four steps.

The solution for two steps is y(1) = 5.25 and for four steps it is y(1) = 5.3125. The magnitude of the error in the two Euler approximations can be calculated using the formula:

Error = |Exact Solution - Approximate Solution|.

The exact solution for the given differential equation and initial condition is y(1) = 5.3125. Therefore, the magnitude of the error in the two Euler approximations is 0.0625.

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The distance the car would travel before coming to a rest is 14.37m.

Four main categories of frictional forces are listed below: -Dry Friction: Dry friction describes how static friction and kinetic friction interact. In other words, it opposes the sliding motion of a moving solid over a stationary solid. As the name implies, fluid friction is the friction of a viscous fluid. The force that opposes the motion of a rolling solid, such as a ball rolling or a set of wheels, is known as rolling friction. Sliding Friction: This type of friction, also known as kinetic friction, is produced when two rolling bodies move in tandem.

Given, μ = 25

g = 9.8m/s²

u = 65 m/s

v = 0m/s

The frictional force,

fμ = -μmg = ma

a = -μg = - 15 × 9.8 = - 147 m/s²

From the 3rd equation of motion,

2as = v² - u²

-2 × 147 × s = 0² - 65 × 65

s = 14.37m

On a dry day, the distance would reduce as friction is more on dry day.

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As the charge at the center of the cube, the flux through each surface is same.

What is Charge ?

In the context of electricity, a "charge" refers to a basic unit of electrical energy that is stored in a body due to its electric potential. Electric charges can be either positive or negative and are associated with the properties of matter that allow it to participate in electrical interactions. When two objects with differing charges come into close proximity, an electric field is generated that can cause a flow of charge, which is known as an electric current.

As the charge at the centre of the cube, the flux through each surface is same.

Using Gauss's law

[tex]$6\phi = \frac{Q}{\epsilon_0} \Rightarrow \phi = \frac{Q}{6\epsilon_0}[/tex]

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Digital circuits fail because the signal is lost somewhere between the circuit input and output stages.

A subfield of electronics called digital electronics is focused with the study of digital signals and the creation of digital signal-using or -generating systems. Boolean logic and discrete signal electronics are terms used to describe electronics, gadgets, and equipment.

Any circuit with a signal that must fit into one of two distinct levels is said to be digital. Each level is represented by one of two states (for instance, on/off, 0/1, true/false). Digital circuits create logic gates using transistors to perform Boolean logic.

In digital electronics, there are primarily two types of digital logic circuits. Sequential logic circuits and combinational logic circuits are what they are.

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Yes, a planet moving in a circular orbit around the Sun with constant speed represents an illustration of the principle of inertia.

According to the principle of inertia, an object in motion will continue to move in a straight line at a constant speed unless acted upon by an external force. In the case of a planet in orbit around the Sun, the planet's inertia causes it to move in a straight line, but the gravitational force from the Sun acts as an external force, continuously pulling the planet back toward the Sun and causing it to follow a circular path. In this way, the planet's constant speed in a circular orbit around the Sun is a demonstration of the principle of inertia.

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The spinning tube of air created by winds moving in opposite directions to tip upwards and become vertical because of the updraft of wind in a supercell. Hence, option (A) is correct.

As a deep, continuously revolving updraft known as a mesocyclone, a supercell is a type of thunderstorm. This causes these storms to occasionally be called spinning thunderstorms.

Supercells, which are the least frequent and have the potential to be the most severe of the four types of thunderstorms (supercell, squall line, multi-cell, and single-cell), are the least common overall.

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The magnitude of the torque exerted by the diver on the diving board is 1295 lb-ft.

The magnitude of the torque the diver exerts on the diving board can be calculated using the equation:

Torque(τ) = Force(F) x distance from the axis

Where the axis is the end of the diving board.

The force the diver exerts on the diving board is equal to his weight, which is 185 lb. The distance from the pivot is 7 ft.

So, the magnitude of the torque the diver exerts on the diving board is:

Torque(τ) = 185 lb x 7 ft = 1295 lb-ft

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If a cordless phone operates at a frequency of 9.00× 1 0 8s –1. 0.33 meters is the wavelength of this radiation.

The wavelength of a wave can be calculated using the formula:

λ = c / f

Where λ is the wavelength, c is the speed of light, and f is the frequency of the wave.

Given the frequency of the cordless phone as 9.00 x 108 s-1, the speed of light as 3 x 108 m/s, and using the formula above, the wavelength can be calculated as:

λ = c / f = 3 x 108 m/s / 9 x 108 s-1 = (3 / 9) x 10^8 m

λ = 0.33 x 10^8 m = 0.33 m

So, the wavelength of the radiation from the cordless phone is approximately 0.33 meters.

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Answer:

A. True

B. ?

C. True

D. False

E. False It is complete opposite

F. ?

The winding of the relay coil has very low resistance, due to the high requirement of electric current.

Relay coil is an automatic switch that open & close the circuit & it is based on the magnetic effect of electric current. The relay coil works as an electromagnet. When the current is supplied through it, it attracts the connecter and circuit becomes closed in other way. The attraction force is a magnetic force which is formulated as F = BILSinθ.

So Magnet force is directly proportional to the electric current(I). By Ohm's law I = V/R, we can see that less the resistance more will be the current for a constant voltage. And more the current more will be the magnetic force for efficient work of the electromagnet.

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