How are the classical laws of conservation of energy and conservation of mass modified by modern relativity

The forces that act on the ball as it is held motionless is the weight and the normal reaction.

We now that force is a vector quantity. This implies that force has magnitude and it also has direction. The direction of the force is what makes it possible for us to resolve a force into its components in the vertical and the horizontal planes.

In this case, when we hold the ball motionless, the forces that act on the ball are the weight of the ball and the normal reaction on the ball. The weight acts downwards while the normal reaction acts upwards.

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I dont see the question to this

Answer:

The correct answer would be B

Explanation:

I took the test and we use wind and turbines to create a renewable energy source.

Answer:

A. In a closed system, the potential energy at the bottom is equal to the kinetic energy at the top.

Explanation:

According to the law of conservation of energy, energy is neither created nor destroyed but transformed from one form to another.

Based on the premise of the law of conservation of energy, both kinetic energy and potential energy are equal at the top and bottom in the system.

This way energy is conserved.

Given:

The initial height of the ball, h=1.6 m

The initial speed of the ball, u=14 m/s

To find:

a) The time of flight of the ball.

b) The range of the ball.

Explanation:

As the ball is thrown horizontally, the ball will have no vertical component of the initial velocity. The velocity of the ball is completely horizontal.

Thus the vertical component of the initial velocity of the ball is u_y=0 m/s.

The horizontal component of the initial velocity of the ball is u_x=u=14 m/s.

a)

From the equation of motion,

Where g is the acceleration due to gravity and t is the time of flight of the ball.

On substituting the known values,

b)

The range of the ball is given by,

On substituting the known values,

Final answer:

a) The time of flight of the ball is 0.57 s

b) The range of the ball is 7.98 m

Answer:

B) 4 m/s²

Explanation:

\( \boxed{ \sf{ F= m \times a}}\)

Here,

Substituting the respective values for F and m:

==> 220 = 55 × a

==> 220 = 55 × a

dividing the equation by 55:

==> 4 = a

Therefore, an object of 55 kg when pulled across a frictionless surface by a force of 220 N accelerates at 4 (m/s)/s

The minimum and maximum braking distances needed to ensure that all vehicles traveling at the posted speed limit can stop before reaching the intersection are as follows:

- For small cars: Minimum ≈ 1773.028 m, Maximum ≈ 1568.850 m

- For large trucks: Minimum ≈ 3285.760 m, Maximum ≈ 2409.595 m

To calculate the minimum and maximum braking distances, we can use the equations of motion for a decelerating vehicle.

The equation for the braking distance of a vehicle is given by:

d = (v^2) / (2 * μ * g)

where d is the braking distance, v is the initial velocity of the vehicle, μ is the coefficient of friction between the tires and the road, and g is the acceleration due to gravity.

Let's calculate the minimum and maximum braking distances separately for small cars and large trucks.

For small cars with a mass of 563 kg:

- Minimum braking distance:

  v = 8989 km/h = (8989 * 1000) / 3600 m/s = 2496.944 m/s

  μ_min = 0.536

  d_min = (v^2) / (2 * μ_min * g) = (2496.944^2) / (2 * 0.536 * 9.8) ≈ 1773.028 m

  Maximum braking distance:

  μ_max = 0.599

  \(d_max = (v^2) / (2 * μ_max * g) = (2496.944^2) / (2 * 0.599 * 9.8) ≈ 1568.850 m\)

For large trucks with a mass of 3951395 kg:

- Minimum braking distance:

  v = 8989 km/h = 2496.944 m/s (same as for small cars)

  μ_min = 0.350

 \(d_min = (v^2) / (2 * μ_min * g) = (2496.944^2) / (2 * 0.350 * 9.8) ≈ 3285.760 m\)

  Maximum braking distance:

  μ_max = 0.480

 \(d_max = (v^2) / (2 * μ_max * g) = (2496.944^2) / (2 * 0.480 * 9.8) ≈ 2409.595 m\)

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Answer:

well u better check the quality of the attachment, first.

all I can see is printer, house, red car and cyan blue bar sadly

Answer:

volume :: is the level at which something is heard or the amount of space that something takes up.

Density :: is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume.

Answer:

The density, of a substance is its mass per unit volume. The symbol most often used for density is ρ, although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: {\displaystyle \rho ={\frac {m}{V}}} where ρ is the density, m is the mass, and V is the volume

Answer:

A. 14553 J

Explanation:

GPE (Gravitational Potential Energy) = mgh

m = 55

g = 9.8 m/s²

h = 27

GPE = 55(9.8)(27) = 14553 J

The magnitude of current flowing through the conductance is:
(a) 0.2 A.

(b) 100 A.

(c) 10 e^(-2t) A.

(d) 0.5 sin(5t) A.

(e) 0 A.

To determine the magnitude of the current flowing through a conductance, we need to use Ohm's Law, which states that the current (I) flowing through a conductor is equal to the voltage (V) across it divided by its conductance (G).

Ohm's Law equation: I = V / G

Given the voltage across the conductance in each case, we can calculate the current magnitude using the given conductance values.

(a) Voltage = 2 mV, Conductance = 10 mS (10 ms)

I = (2 mV) / (10 mS)

I = 0.2 A

The magnitude of the current flowing through the conductance is 0.2 A.

(b) Voltage = -1 V, Conductance = 10 mS (10 ms)

I = (-1 V) / (10 mS)

I = -100 A

The magnitude of the current flowing through the conductance is 100 A.

(c) Voltage = 100 e^(-2t) V, Conductance = 10 mS (10 ms)

I = (100 e^(-2t)) / (10 mS)

I = 10 e^(-2t) A

The magnitude of the current flowing through the conductance is 10 e^(-2t) A.

(d) Voltage = 5 sin(5t) V, Conductance = 10 mS (10 ms)

I = (5 sin(5t)) / (10 mS)

I = 0.5 sin(5t) A

The magnitude of the current flowing through the conductance is 0.5 sin(5t) A.

(e) Voltage = 0 V, Conductance = 10 mS (10 ms)

I = (0 V) / (10 mS)

I = 0 A

The magnitude of the current flowing through the conductance is 0 A.

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Answer:

because the car needs gas so why wouldnt it stop working

Explanation:

It takes approximately 5.52 seconds for the ball to reach the ground when thrown straight downward from a height of 150 meters with an initial speed of 10 m/s.

The initial speed of the ball is given as 10 m/s. The ball is thrown straight downward from the top of a tall building.

To calculate the time it takes for the ball to reach the ground, we can use the equation for the motion of an object in free fall:

h = (1/2)gt^2 where h is the height, g is the acceleration due to gravity (approximately 9.8 m/s^2), and t is the time.

In this case, the initial height is not provided, so we cannot directly calculate the time it takes for the ball to reach the ground. However, we can use the fact that the ball is thrown downward to make an assumption about the initial height.

Since the ball is thrown downward, it is safe to assume that the initial height is positive. Let's assume the initial height is 150 meters.

Substituting the values into the equation, we have:
150 = (1/2)(9.8)t^2

To solve for t, we can rearrange the equation:
t^2 = (2 * 150) / 9.8
t^2 = 300 / 9.8
t^2 = 30.61

Taking the square root of both sides, we find:
t = √30.61
t = 5.52

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Answer:

it is a the answer is a btw

Explanation:

The statements true in regards to heat is 3. Heat is a form of energy, can be reflected by a mirror, and cannot pass through a vacuum.

Heat is a form of energy. Heat is the transfer of thermal energy from one object to another. Thermal energy is the energy of motion of the particles in an object. Heat can be reflected by a mirror. Heat is a form of electromagnetic radiation, and electromagnetic radiation can be reflected by mirrors.

Heat cannot pass through a vacuum. Heat is a form of electromagnetic radiation, and electromagnetic radiation cannot pass through a vacuum. Heat is not an electromagnetic radiation. It is a form of energy that is transferred from one object to another because of a difference in temperature.

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Complete question:

Which of the following statements are true regarding heat?

(a) Heat is a form of energy

(b) Heat can be reflected by mirror

(c) Heat is an electromagnetic radiation

(d) Heat can pass through vacuum

Select the correct answer from the codes given below :

1. 1, 2 and 3

2. 2, 3 and 4

3. 1, 2 and 4

4. 1, 3 and 4

Answer:

25 feet

Explanation:

Car brakes must stop a car moving at 20m/h within 25 feet

According to standard guidelines, the required stopping distance for a car traveling at 20 miles per hour must be within approximately 20 feet.

It's important to note that this estimate assumes ideal road and weather conditions, as well as a properly functioning braking system.

Actual stopping distances can vary depending on factors such as vehicle condition, road conditions (e.g., wet or icy surfaces), tire grip, driver reaction time, and other variables.

The required stopping distance for a car traveling at 20 miles per hour must be within approximately 20 feet.

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To find the resistor with the largest resistance, let's use Ohm's law formula V = IR. where V is the voltage, I is the current, and R is the resistance. The resistor A has the largest resistance. The correct answer is resistor A.

We are given that two resistors, A and B, are connected in series to a 9 V battery. Also, the first resistor, A, has a voltage of 6 V across it. This means that the voltage across resistor B is 9 V - 6 V = 3 V.

Now, let's find the resistance of resistor A using Ohm's law:

R = V / I

where V = 6 V and I is the same as the current flowing through resistor B since they are connected in series. Let's assume the current is I.

Therefore,

Ra = 6 V / I

Now, let's find the resistance of resistor B using Ohm's law:

R = V / I

where V = 3 V and I is the current flowing through both resistors in series.

Therefore,

Rb = 3 V / I

We are to find which resistor has the largest resistance.

This means we should compare Ra and Rb.

Ra = 6 V / I

Rb = 3 V / I

To compare the two resistances, we can simplify them as follows:

Ra = 6 / I

Rb = 3 / I

We can see that Ra is twice the value of Rb.

Therefore, resistor A has the largest resistance. Answer: Resistor A

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Answer: 20 minutes

Explanation:

Given the following :

Average speed of train = 120km/hr

Distance = 40km.

The time take by the train moving at an average speed of 120km/hr to cover a distance of 40km due is ;

Recall:

Speed = distance / time

Therefore,

Time taken = distance covered / speed

Time taken = 40km / 120km/hr

Time taken = 1/ 3 hr

Therefore, 1/3 rd of an hour equals

1/3 × 60 = 20 minutes.

Time taken) 20 minutes

Time taken by tain to cover distance is 20 minutes as:

Distance= 40 km

Speed= 120 km/h

Time= distance/speed

= 40/120

= 1/3 hour

= 20 min

or  =0.33 hrs

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A river 100 m wide flows due south at 1 m/s, a boat that goes 1 m/s relative to the water .The resultant distance will be 141m.

Option A is correct.

The sum of an object's individual vector velocities is its final velocity. The scalar product of an object's mass and its acceleration vector is equal to the sum of its vector forces.

Considering that the boat travels in a river that flows 1 m/s due south at a speed of 1 m/s due east.

The positive x and y axes should be represented by the north and east, respectively.

After that, we can convert the boat's resulting velocity into a vector.

Vr = i - j ( 1 m/s on x axis and -1m/s on y axis)

The time required to travel 100m from west to east at a speed of 1m/s is;

Time t = distance/speed = 100m/1m/s = 100s

Distance = velocity × time = (i - j) × 100 = 100i - 100j

Distance = 100i - 100j (in vector form)

Magnitude of the Resultant distance can be given as:

dr = √(dx ²+ dy²)

dr = √(100² + 100²)

dr = √(20000)

dr = 141.42m

dr = 141m

The relative velocity refers to how one observer would perceive another moving object within their own frame. The velocity of an object when there are multiple influences on its motion in a fixed reference frame is known as the resultant velocity.

At the point when an item, say, a boat, goes at a specific speed, and the medium through which it voyages, say, a stream, has its own speed, we can track down the resultant speed of the item by adding the two speeds. We find the boat's resulting velocity vector in this example.

Incomplete question:

A river 100 m wide flows 1 m/s due south. A boat that travels 1 m/s relative to the water is pointed due east as it crosses from the west bank. Relative to its starting point, the boat travels

A) 141 m.

B) 100 m.

C) 200 m.

D) more than 200 m.

E) nowhere

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a)

i. The force exerted on the piston by the air in the freezer is 240 N.

ii. The work done on the piston by the air as it pushes the piston 0.021 m into the cylinder is 5.04 J.

b) The change in the internal energy of the cylinder is 3486 J.

a)  

i. To calculate the force exerted on the piston by the air in the freezer, we can use the formula:

Force = Pressure * Area

Given:

Pressure (P) = 1.0 × \(10^5\) Pa

Area (A) = 2.4 ×\(10^(^-^3^) m^2\)

Substituting these values into the formula, we have:

Force = (1.0 × 10^5 Pa) * (2.4 ×\(10^(^-^3^) m^2)\)

      = 240 N

ii. To calculate the work done on the piston by the air in the freezer as the air pushes the piston, we can use the formula:

Work = Force * Distance

Given:

Force = 240 N

Distance (d) = 0.021 m

Substituting these values into the formula, we have:

Work = (240 N) * (0.021 m)

     = 5.04 J

b) To calculate the change in the internal energy of the cylinder, we can use the formula:

ΔU = mcΔT

Given:

Initial temperature (T1) = 21°C = 21 + 273 = 294 K

Final temperature (T2) = -18°C = -18 + 273 = 255 K

Thermal capacity (c) = 89 J/°C

Substituting these values into the formula, we have:

ΔU = (89 J/°C) * (294 K - 255 K)

   = 3486 J

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Answer:

Longitudinal waves

Explanation:

With sound waves, the energy travels along in the same direction as the particles vibrate. This type of wave is known as a longitudinal wave , so named because the energy travels along the direction of vibration of the particles.

Answer:

\( s = ut + \frac{1}{2} a {t}^{2} \\ u = 0 \\ a = 4.2 \: m {sec}^{ - 2} \\ t = 10sec \\ s = 0 + \frac{1}{2} (4.2) {10}^{2} \\ = 1.2 \times 100 \\\boxed{ s = 120 \: m}\)

The speed of the ball released is 7.75 m/s.

The speed of the can be determined from the principle of conservation of energy as shown  below;

supplied energy of the dispenser = kinetic energy of the ball

Power x time = kinetic energy of the ball

10 x 15 = ¹/₂ x 5 x v²

150 = 2.5v²

v² = 150/2.5

v² = 60

v = √60

v = 7.75 m/s

Thus, the speed of the ball released is 7.75 m/s.

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When the original resistor is replaced with 3 times more resistive material, the resistance of the circuit increases by factor of 3 and  the current flowing in the cirucit decreases by a factor 3.

Ohm's law states that, the current flowing in a conductor is directly proportional to the potential across the conductor.

V = IR

where;

When the resistance increases, the current flowing in the circuit decreases.

When the original resistor is replaced with 3 times more resistive material, the resistance of the circuit increases by factor of 3 and  the current flowing in the cirucit decreases by a factor 3.

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Perspiration dries on a person's skin. The correct answer is option B.

Vaporization is the process by which a liquid changes into a gas or vapor, and perspiration is a liquid that is secreted by sweat glands in the skin. When perspiration dries on a person's skin, it is evaporating and changing into a gas due to the heat energy from the person's body. This is an example of the physical change of state from a liquid to a gas through vaporization. The other options do not involve a change of state from a liquid to a gas, and instead involve other processes such as condensation. Hence option B  is the correct answer .

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To take advantage of the symmetry of the situation when using Gauss's law to find the electric field from a line charge, you should choose a Gaussian surface that is also symmetrical.

In the case of a line charge, the most appropriate choice is a cylindrical Gaussian surface centered on the line charge. The Gaussian surface should be a cylinder with its axis aligned with the line charge and its length extending along the line charge. This choice allows us to exploit the cylindrical symmetry of the system.

By choosing a cylindrical Gaussian surface, the electric field will have a constant magnitude and be directed radially outward or inward at every point on the surface. This allows us to simplify the integration and perform it over a constant electric field. Thus, to find the electric field a distance r from a line charge using Gauss's law, the integration should be performed over a cylindrical Gaussian surface centered on the line charge with its axis aligned with the line charge.

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An animal might use more than one type of clue to find its way due to change in the way one mechanism used to work.

Different animals have different senses heightened, that lets them use different mechanisms to navigate. Some of the mechanism include remembering landmarks, solar navigation, star navigation, magnetoreception, olfaction, gravity receptors etc.

For example, a bird using landmark to navigate will find it hard to navigate in the same way again if the landmark has been changed. So it has to depend on other senses such as olfaction or magnetoreception to navigate.

Therefore, an animal might use more than one type of clue to find its way due to change in the way one mechanism used to work.

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To calculate the power factor of the LRC circuit, we need to determine the ratio of the resistance to the impedance. The correct option is A) 0.96.

The impedance of the circuit (Z) is given by the formula \(Z = \sqrt{(R^2 + (Xl - Xc)^2)\), where R is the resistance, Xl is the reactance due to inductance, and Xc is the reactance due to capacitance.

Substituting these values into the formula, we have\(Z = \sqrt{((28 k \Omega)^2 + (9.0 k \Omega - 17 k \Omega)^2).\)

Once we have the impedance, we can calculate the power factor (PF) by taking the ratio of the resistance to the impedance: \(PF = R / Z\).

To evaluate the expression for the power factor, we first need to calculate the impedance (Z) using the given values:

\(Z = \sqrt{((28 k\Omega)^2 + (9.0 k\Omega - 17 k\Omega)^2)\)

Simplifying the expression within the square root:

\(Z = \sqrt{((784 k\Omega^2) + (64 k\Omega^2))\\Z = 29.14 k\Omega\)

Next, we can calculate the power factor (PF) by dividing the resistance (R) by the impedance (Z):

\(PF = R / Z\\ = 28 k\Omega / 29.14 k\Omega\\PF = 0.96\)

Therefore, the power factor of the LRC circuit is approximately 0.96. Comparing this result to the answer choices, we can see that the correct option is A) 0.96.

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A plane mirror always forms a virtual image because of the following reasons:

1. When light rays from an object fall on a plane mirror, they get reflected from the mirror. After reflection, they never meet at any point in real but they appear to meet at some point.

2. The image formed by a plane mirror cannot be obtained on a screen.

3. Plane mirrors never focus light into a single converging point.

Answer:

wool

Explanation:

Wool comes from sheep.  Rayon, candles (the paraffin type) and petrochemicals all come from petroleum.