HELP PLS 100 POINTS TAKING TEST RN


Suppose you are in a car that is going around a curve. The speedometer reads a constant 30
miles per hour. Which of the following is NOT true?

You and the car are accelerating.

Your speed is constant.

Your velocity is constant.

Your acceleration is constant.

Answer:

This is what I got the teacher hasn’t graded it yet so sorry if it’s not right

Explanation:

The total displacement is -80 m, indicating that the final position is 80 m west of the initial position (pillar). The total distance traveled is 480 m.

To calculate the total displacement and total distance traveled, we need to consider the directions and magnitudes of the displacements for each segment of the run.

Segment 1:

Distance: 200 m

Direction: East (positive x-direction)

Speed: 5.0 m/s

Segment 2:

Distance: 280 m

Direction: West (negative x-direction)

Speed: 4.0 m/s

Total displacement can be calculated by adding the individual displacements:

Displacement = Displacement in Segment 1 + Displacement in Segment 2

In Segment 1, since the distance is covered in the positive x-direction (east), the displacement is positive:

Displacement in Segment 1 = 200 m (positive)

In Segment 2, the distance is covered in the negative x-direction (west), so the displacement is negative:

Displacement in Segment 2 = -280 m (negative)

Now we can calculate the total displacement:

Total Displacement = Displacement in Segment 1 + Displacement in Segment 2

= 200 m + (-280 m)

= -80 m

The total displacement is -80 m, indicating that the final position is 80 m west of the initial position (pillar).

To calculate the total distance traveled, we need to consider the magnitudes of the individual displacements:

Total Distance = Distance in Segment 1 + Distance in Segment 2

= 200 m + 280 m

= 480 m

The total distance traveled is 480 m.

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Answer: b

Explanation:

Ec= (1/2)m × v^2

By the formula, you can see that the bigger the mass, the bigger the Cinetic Energy.

b: b; its mass is smaller

Between ball B and ball C, ball B has LESS potential energy because its mass is smaller.

A potential energy, stored energy that depends upon the relative position of various parts of a system. A spring has more potential energy when it is compressed or stretched.

Potential energy is given by formula.

\(P.E= m*g*h\)

Since, P.E is directly proportional to mass. Thus, the ball having smaller mass will have the less P.E.

Thus, option b is correct.

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This question involves the concepts of current, power, and charge.

a) The power of taser is "2.75 watt".

b) The magnitude of charge flow per second "2.5 x 10⁻³ C/s".

c) Electrons flow per second is "1.56 x 10¹⁶ electrons/s".

The power of the taser can be given by the following formula:

P = IV

where,

Therefore,

P = (2.5 x 10⁻³ A)(1100 V)

P = 2.75 Watt

The charge flow per second is equal to the current passing through taser.

\(\frac{q}{t}=I\)

where,

Therefore,

\(\frac{q}{t}=2.5\ x\ 10^{-3}\ C/s\)

The electron flow per second is given by the following formula:

\(I = \frac{q}{t} = \frac{ne}{t}\\\\\frac{n}{t}=\frac{q}{te}\)

where,

Therefore,

\(\frac{n}{t}=\frac{2.5\ x\ 10^{-3}\ C/s}{1.6\ x\ 10^{-19}\ C}\\\\\frac{n}{t}=1.56\ x\ 10^{16}\ electrons/s\)

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Answer:

Elements in a family have the same

Ans C. number of valence electrons

The spinal column has four organic bends. the sacral, lumbar, cervical, and thoracic curves.

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Answer and Explanation:Option A->The innermost layer of the earth is known as the core. It is divided into inner core and outer core. It comprises of a high concentration of nickel and iron.

The woman will be moving at a speed of 5.2 m/s after the push.

Speed is the rate at which an object or person moves from one place to another. It is measured in distance over time, such as meters per second, miles per hour, or kilometers per hour. Speed is a scalar quantity, meaning it has magnitude but no direction.

The man and woman are moving with the same speed before the push, so they must be moving with the same speed after the push. This is because momentum must be conserved. Momentum is equal to the mass times the velocity, so the momentum of the two-stater system before the push is equal to the momentum of the system after the push. We can calculate the momentum before the push by multiplying the total mass (85kg + 66kg = 151 kg) and the velocity (2.3 m/s), and find it to be 344.3 kg*m/s. We can then calculate the velocity of the woman after the push by dividing the momentum by the mass, and find it to be 344.3/66 = 5.2 m/s. Therefore, the woman will be moving at a speed of 5.2 m/s after the push.

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Answer:

Explanation:

Let's look at a mathematical representation of this. The equation for tis is just a souped up version of Newton's 2nd Law:

F - f = ma. It an object is moving at a constant speed, the acceleration of that object is 0. That changes this equation to

F = f which states that the applied Force equals the frictional force, choice a.

The seemingly invincible but very important goal of passing physics, and therefore maintaining a high GPA, motivated Kelly to study extra long hours.

The goal of the Physics primary is to provide the scholar with a broad understanding of the bodily standards of the universe, to help them develop critical thinking and quantitative reasoning skills, to empower them to suppose creatively and critically about medical troubles and experiments, and to provide schooling.

The key to passing a physics examination is to memorize critical equations and their applications. To do so, write down the equation on one facet of a observe card and what it's used for on the other side, then go through the cards and memorize every equation.

Physics allows us to prepare the universe. It deals with basics, and enables us to look the connections among seemly disparate phenomena. Physics gives us powerful gear to help us to explicit our creativity, to peer the sector in new approaches after which to alternate it. Physics is useful.

Invincible is an American adult animated superhero television series, based on the Image Comics series.

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The force constant of the spring is 200.696 N/m & The height the object achieves when the spring releases its energy is 2.5087 m

The spring constant is the force needed to stretch or compress a spring, divided by the compressive or expansive distance. It's used to determine stability or instability in the spring, and therefore the system it's intended for. we know,

F = kx

Therefore,

k = F/x

We also know that the force being exerted on the spring is equal to the mass of the object. Hence, F = mg = 5.13 * 9.8 N = 50.174 N and we know compression due to the mass is 0.25m. Therefore,

K = 50.174/0.25 N/m

K = 200.696 N/m

Therefore, The Spring Constant is 200.696 N/m

On release, the spring potential energy gets converted to kinetic energy. Hence, on release, the height attained by the object is given by:

h = \(1/2 kx^{2}\)

We know that k=200.696 N/m and x=0.25 m. Therefore the height is:

h = \(1/2 (200.696 N/m)(0.25 m)^{2}\)

h = 2.5087 m

Therefore, the force constant of the spring is 200.696 N/m & The height the object achieves when the spring releases its energy is 2.5087 m

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If a  car moving at 30 m / s has 900 kJ of kinetic energy, then the mass of the car would have been 2000 kilograms.

Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total stored energy in the system which is represented by total potential energy.

As for the given problem, we have to find out the mass of the car if the car moving at 30 m/s has 900 kJ of kinetic energy.

Kinetic energy = 1 / 2 m v²

         900000 = 0.5 × m × 30²

                    m = 1000 / 0.5

                        = 2000 kilograms

Thus, If a  car moving at 30 m / s has 900 kJ of kinetic energy, then the mass of the car would have been 2000 kilograms.

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The displacement of a certain object is described by y left parenthesis t right parenthesis equals  5sin(4.3πt)., where t is in seconds. The frequency of the object is is 2.15 Hz.

The frequency of an oscillating object is the number of complete cycles it completes per unit of time. In this case, the displacement of the object is described by the equation y(t) = 5sin(4.3πt).

To find the frequency, we can look at the coefficient of t inside the sine function. In this case, the coefficient is 4.3π.

The general formula to calculate the frequency (f) from the angular frequency (ω) is:

f = ω / (2π)

In this case, the angular frequency (ω) is 4.3π.

Substituting the values into the formula:

f = 4.3π / (2π)

The π cancels out, leaving:

f = 4.3 / 2

f = 2.15 Hz

Therefore, the frequency of the object described by the given equation is 2.15 Hz.

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Answer:

A

Explanation:

Amplitude = height of the wave = 1

Wavelength = 3

They are slightly shifted.

The first statement is the correct one.  Don't make me type the whole thing out.

Newton's Second Law of Motion states that the net force acting on an object is directly proportional to its acceleration. The proportionality constant, which is the object's mass, gives the equation ma = f (force equals mass times acceleration). This means that if a force is applied to an object with a certain mass, it will accelerate proportionally to the magnitude of the force.

Applying Newton's Second Law of Motion allows us to determine the force required to move an object of a certain mass a certain distance. We can also use it to calculate the acceleration of an object given its mass and the force acting on it. The second law states that the acceleration of an object is proportional to the force applied to it and inversely proportional to its mass. If the mass of the object remains constant, the acceleration produced is directly proportional to the force applied.

The second law also tells us that if a net force is acting on an object, it will accelerate in the direction of that force. This law can be used to explain the motion of objects in both linear and rotational motion. For example, when a bat hits a ball, the force of the bat on the ball causes it to accelerate, and the ball moves in the direction of that force. In summary, applying Newton's Second Law of Motion is a powerful tool for understanding the motion of objects and how they respond to forces acting on them.

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The voltage across the conductor is 500V.

Ohm's law states that the current through a conductor is directly proportional to the voltage across the conductor.

Here,

Current in the conductor, I = 50A

Resistance of the conductor, R = 10 Ω

According to Ohm's law,

V α I

V = IR

V = 50 x 10

V = 500 V

Hence,

The voltage across the conductor is 500V.

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Answer:

1.53 seconds (2 d.p.)

Explanation:

When a body is projected through the air with initial speed u, at an angle of θ to the horizontal, it will move along a curved path.

Therefore, trigonometry can be used to resolve the body's initial velocity into its vertical and horizontal components:

Because the projectile is modeled as moving only under the influence of gravity, the only acceleration the projectile will experience will be acceleration due to gravity (a = 9.8 m/s²).

Constant Acceleration Equations (SUVAT)

\(\boxed{\begin{array}{c}\begin{aligned}v&=u+at\\\\s&=ut+\dfrac{1}{2}at^2\\\\ s&=\left(\dfrac{u+v}{2}\right)t\\\\v^2&=u^2+2as\\\\s&=vt-\dfrac{1}{2}at^2\end{aligned}\end{array}} \quad \boxed{\begin{minipage}{4.6 cm}$s$ = displacement in m\\\\$u$ = initial velocity in ms$^{-1}$\\\\$v$ = final velocity in ms$^{-1}$\\\\$a$ = acceleration in ms$^{-2}$\\\\$t$ = time in s (seconds)\end{minipage}}\)

When using SUVAT, assume the object is modeled as a particle and that acceleration is constant.

If an object is thrown at 30 m/s from flat ground at an angle of 30° then:

When the object reaches its maximum height, the vertical component of its velocity will momentarily be zero.

Resolving vertically, taking up as positive:

\(\begin{aligned}\textsf{Using}\;\; v &=u+at:\\\\\implies 0 &=30 \sin 30^{\circ}+(-9.8)t\\0 &=15-9.8t\\9.8t &=15\\t &=\dfrac{15}{9.8}\\t&=1.53\;\; \sf s\;(2 \; d.p.)\end{aligned}\)

Therefore, the length of time the object takes to reach the highest point of its flight is 1.53 seconds (2 d.p.).

The fastest rollercoaster in the world is the formula rossa in abu dhabi, united arab emirates, speed of this is 240 km/h (149.1 mph)

The rate at which an object's distance traveled changes is measured by its speed. In terms of measurement, speed is a scalar, meaning it has magnitude but no direction. Speed is the rate at which an object moves over a given distance. a thing that travels at a high rate of speed and covers a lot of distance quickly. A slow-moving object, on the other hand, travels a comparatively short distance in the same amount of time when moving at a low speed. An object with zero speed is completely immobile.

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The force required to keep the block moving at a constant velocity to the right is equal to the force of kinetic friction. In this case, the force required is 31.36 N.

To calculate the force required to keep the block moving at a constant velocity to the right, we need to consider the forces acting on the block.

1. First, let's find the gravitational force acting on the block. The formula for gravitational force is F_gravity = m * g, where m is the mass of the block and g is the acceleration due to gravity (approximately 9.8 m/s^2).
  Plugging in the values, we get F_gravity = 4 kg * 9.8 m/s^2 = 39.2 N.

2. Next, let's determine the force of kinetic friction acting on the block. The formula for kinetic friction is F_friction = μ * N, where μ is the coefficient of kinetic friction and N is the normal force. The normal force is equal to the gravitational force acting on the block, which we calculated earlier as 39.2 N.
  Plugging in the coefficient of kinetic friction, μ = 0.8, we get F_friction = 0.8 * 39.2 N = 31.36 N.

3. Since the block is moving at a constant velocity, we know that the net force acting on the block is zero. Therefore, the force required to keep the block moving at a constant velocity to the right is equal to the force of kinetic friction.
  In this case, the force required is 31.36 N.


1. Gravitational force (F_gravity) is calculated using the formula F_gravity = m * g, where m is the mass of the block and g is the acceleration due to gravity (approximately 9.8 m/s^2). In this case, F_gravity = 4 kg * 9.8 m/s^2 = 39.2 N.

2. Kinetic friction force (F_friction) is determined using the formula F_friction = μ * N, where μ is the coefficient of kinetic friction and N is the normal force. The normal force is equal to the gravitational force acting on the block, which we calculated earlier as 39.2 N. Plugging in the coefficient of kinetic friction, μ = 0.8, we get F_friction = 0.8 * 39.2 N = 31.36 N.

3. Since the block is moving at a constant velocity, the net force acting on the block is zero.

Therefore, the force required to keep the block moving at a constant velocity to the right is equal to the force of kinetic friction. In this case, the force required is 31.36 N.

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Answer:

d = 375 m

Explanation:

The speed of sound is constant in any medium, therefore we can use the uniform motion relationships

          v = x / t

          x = v t

In this case it indicates that the time since the sound is emitted and received is t = 0.50 s, in this time the sound traveled a round trip distance

           x = 2d

          2d = v t

          d = v t/2

let's calculate

          d = 1500 0.5 / 2

          d = 375 m

Answer:

C

Explanation:

You don't want to buy a 1000 dollar credit card.

The features are useful, like the little sync feature to automatically pay is awesome.

The plan of use for the card is important

the card aesthetic doesn't affect the card in any way, just your personal preference

The correct order of increasing impedance is:

C. PZT, gel, skin, matching layer

Impedance is a measure of the opposition to the flow of sound waves in a medium. It depends on the density and speed of sound in the material. In the given options, the order of increasing impedance can be determined by considering the properties of the materials involved.

PZT (lead zirconate titanate) has a higher impedance than gel, skin, and the matching layer. PZT is a piezoelectric material commonly used in ultrasound transducers and has a higher density and speed of sound, leading to higher impedance.

Gel has a lower impedance compared to PZT but higher impedance than skin and the matching layer. Gel is used as a coupling medium between the transducer and the skin to enhance acoustic coupling and minimize impedance mismatch.

Skin has a lower impedance than both gel and the matching layer. It is the outermost layer and acts as an interface between the transducer and the biological tissue.

The matching layer has the lowest impedance among the given options. It is designed to match the impedance of the PZT to the impedance of the tissue being imaged, facilitating efficient sound transmission.

Therefore, the correct order is C.

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The cooling rate of the object is 0.054.

Let's find the cooling rate (k) of an object using the given information. Ts = 10 °CTo = 110 °CT1 = 35 °Ct2 = 25 minutes. Now, the given formula is T = Ts + (To - Ts) e ^ -kt. Here, we know that the temperature drops from 110°C to 35°C, which is 75°C in 25 minutes. Now, we will substitute the values in the formula as follows:35 = 10 + (110 - 10) e ^ (-k × 25) => (35 - 10) / 100 = e ^ (-k × 25) => 25 / 100 = k × 25 => k = 0.054. Therefore, the cooling rate of the object is 0.054. Hence, option A is correct.

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Explanation:

A)

Using Law of conservation of momentum

m1v1 = m2v2

85 kg  * 2.7 m/s  =  340 kg * v2

v2= .68 m/s

B)

 Less

C)    85  * 2.7 = 410 * v2

       v2 = .56 m/s

The log's speed is 0.67 m/s relative to the shore. If the log's mass increases, its speed will decrease. In the case of a 410kg log, its speed will be 0.56 m/s.

This is a problem related to conservation of momentum. Initially, both the lumberjack and the log are at rest, therefore, the total momentum is zero. When the lumberjack moves, he imparts momentum to the log in the opposite direction. To find this speed, we use the equation of conservation of momentum, which is m1v1 = -m2v2. The lumberjack has a mass of 85kg, and the log has a mass of 340kg, with the lumberjack moving at 2.7 m/s. Therefore, we find that the speed of the log (v2) is 0.67 m/s.

For part B, if the mass of the log is greater, its speed relative to the shore will be less than the speed found in part A. A larger mass requires more force to move at the same speed.

For part 3, if we replace the mass of the log with 410kg and solve for the speed, v2 = (85kg * 2.7m/s) / -410kg, we find that the speed is approximately 0.56 m/s, which verifies the conclusion in part B that a larger mass log moves at a slower speed.

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Answer:

5  seconds

Explanation:

Rock A is thrown horizontally off a cliff with a velocity of 15 m/s. The rock lands 75m from the base of the cliff, According to the above information the time spend by the rock will be "5 s".

To find the time given values are:

Initial horizontal velocity, u = 15 m/s

Horizontal Length, R = 75 m

The range of a projectile can be defined as the distance horizontally that projectile which travels with the time and then it is launched for the time and also it comes back down to the same height to the height of where it is launched. According to a projectile motion, there will be no horizontal acceleration at work.

The range of projectile will be:

R=υt

t = R /υ

By substituting the values,

t = 75 /15

t = 5 sec

Rock A is thrown horizontally off a cliff with a velocity of 15 m/s. The rock lands 75m from the base of the cliff, According to the above information the time spend by the rock will be "5 s".

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Explanation:

Hi, there!!

Energy is defined as the capacity or ability to do work. It's SI unit is Joule.

here,

Joule = (kg×m×m)/(s×s)

= kg×m^2/s^2.

Therefore, the derived unit is kg.m^2 by s^2.

Hope it helps...

The volume of the air that we have from the question is 829 L

The ideal gas equation, also known as the ideal gas law, is a fundamental equation in thermodynamics that describes the relationship between the pressure (P), volume (V), temperature (T), and number of moles (n) of an ideal gas.

We know that;

PV = nRT

P = pressure

V = volume

n = Number pf moles

R = gas constant

T = Temperature

Then;

Number of moles of the air = 1000 g/29 g/mol

= 34.5 moles

Then;

V = nRT/P

V = 34.5 * 0.082 * 293/1

V = 829 L

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Answer:

tôi đoán lagf  pjhAWN ỨNG HÓA HỌC

Explanation:

A student ties a lead cube to an oval-shaped block to prevent it from floating and immerses it in water density as part of a study to identify the sort of wood it is composed of.

The term "density" (also known as "volumetric mass density" or "specific mass") refers to a substance's mass per unit of volume. Although the Latin letter D may also be used, the sign most frequently used for density is (the lower case Greek letter rho).

According to legend, Archimedes shouted "Eureka!" as he rushed through the Sicilian streets. ("I've discovered it!") He had figured out what density was. Everyone has spent a significant amount of time in water during their life. The second thing Archimedes noticed was that he felt lighter floating.

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