A space vehicle, of mass 555 kg, experiences a gravitational pull from Earth of255 N. The mass of Earth is 5.98 x 10^24 kg. How far is the vehicle above the surface of Earth?

Answer: When it comes to energy saving, energy management is the process of monitoring, controlling, and conserving energy in a building or organization. Typically this involves the following steps: Metering your energy consumption and collecting the data.

Explanation:

Given:

The phenomenon of beats occurs when tuning two musical instruments

To find:

The reason

Explanation:

Two waves with nearly the same frequencies and same amplitudes superimposed with each other produce beats. If an instrument is sounded against a standard frequency and tuned until the beats disappear then the instrument is in tune with the standard frequency. The tones interfere constructively and destructively with each other.

Hence, the second option is the correct one.

Answer:

500 / 31.25 = 16

(1/2)^n = 1/16     where n is the number of elapsed half-lives

(1/2)^4 = 1/16     so the sample has gone thru 4 half-lives

43 min * 4 = 172 min = 2.87 hrs

According to Archimede's principle, a physical object experiences an upthrust due to a difference in pressure between upper and lower  surfaces.

An upthrust is also referred to as buoyancy and it can be defined as an upward force which is exerted by a fluid (liquid or gas), so as to oppose the weight of a partially or fully immersed physical object that is floating in it.

Based on scientific information, a physical object experiences an upthrust when it is immersed in a fluid due to a difference in height and pressure between upper (top) and lower (bottom) surfaces.

According to Archimede's principle, there is a higher pressure at the bottom of the physical object due to height, and a lower pressure at the top of the physical object.

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Explanation:

1) To calculate the pressure difference between the ends of the tube, we can use the formula provided:

V = (π * r^4 * ΔP) / (8 * η * L)

Where:

V = Volume flow rate of water = 1.5 * 10^-6 m^3/s

r = Radius of the tube = 1.8 mm = 0.0018 m

L = Length of the tube = 13 cm = 0.13 m

η = Viscosity of water (to be determined)

First, let's convert the radius and length into SI units:

r = 0.0018 m

L = 0.13 m

Now, rearrange the equation to solve for the pressure difference ΔP:

ΔP = (V * 8 * η * L) / (π * r^4)

ΔP = (1.5 * 10^-6 m^3/s * 8 * η * 0.13 m) / (π * (0.0018 m)^4)

2) Now, let's determine the viscosity of the water (η):

Given the density of water (ρ) = 1000 kg/m³

We can use the formula for volume flow rate for a pipe:

V = (π * r^4 * ΔP) / (8 * η * L)

Rearrange the formula to solve for η:

η = (π * r^4 * ΔP) / (8 * V * L)

η = (π * (0.0018 m)^4 * ΔP) / (8 * 1.5 * 10^-6 m^3/s * 0.13 m)

Now we can calculate both the pressure difference (ΔP) and the viscosity (η).

Note: For a more accurate calculation, you would need the value of the gravitational acceleration (g) since the height of the water column above the tube affects the pressure difference. However, in this specific case, the value of g is not given, so we'll assume it's approximately 9.81 m/s², the standard gravitational acceleration.

Perform the calculations:

ΔP = (1.5 * 10^-6 m^3/s * 8 * 9.81 m/s^2 * 0.13 m) / (π * (0.0018 m)^4) ≈ 0.0449 Pa

η = (π * (0.0018 m)^4 * 0.0449 Pa) / (8 * 1.5 * 10^-6 m^3/s * 0.13 m) ≈ 0.00162 Pa·s

So, the pressure difference between the ends of the tube is approximately 0.0449 Pa, and the viscosity of the water is approximately 0.00162 Pa·s.

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Answer:

Lack of cleanliness

Explanation:

Dust and other debris accumulate over time. If you have pets, their hairs pile on too. These clog the lining of where the door closes. If you want your screen door to move more smoothly, you have to clean the lining more frequently.

Answer:

A , D , E

Explanation:

Solution:-

- Consider the two identical objects with mass ( m ).

- The stiffness of the springs are ( k1 and k2 ).

- Both the spring store 55.0 J of potential energy.

- We will apply the principle of energy conservation on both the systems. In both cases the spring stores 55.0 Joules of energy. Once released, the objects gain kinetic energy with a consequent loss of potential energy in either spring.

- The maximum speed ( v ) is attained when all the potential energy is converted to kinetic energy.

- Apply Energy conservation for spring with stiffness ( k1 ).

                         ΔU = ΔEk

                         55.0 = 0.5*m*v^2

                         v = √ ( 110 / m )

- Apply Energy conservation for spring with stiffness ( k2 ).

                         ΔU = ΔEk

                         55.0 = 0.5*m*v^2

                         v = √ ( 110 / m )

Answer: Both objects will have the same maximum speed ( A )

- We are told that one spring is more stiff as compared to the other one. The measure of stiffness is proportionally quantified by the spring constant. To mathematically express we can write it as:

                         k1 > k2

Where,

                 k1: The stiff spring

                 k2: The flexible spring

Answer: The stiff spring has a larger spring constant than the flexible spring. ( D )

- We will assume that the spring with constant ( k1 ) undergoes a displacement ( x1 ) and the spring with constant ( k2 ) undergoes a displacement ( x2 ). The potential energy stored in both spring is the same. Hence,

                      U1 = U2

                      0.5*( k1 ) * ( x1 )^2 = 0.5*( k2 ) * ( x2 )^2

                      [ k1 / k2 ] = [ x2 / x1 ]^2

Since,

                     k1 > k2 , then [ k1 / k2 ] > 1    

Then,

                     [ x2 / x1 ]^2 > 1

                     [ x2 / x1 ] > 1

                     x2 > x1                  

Answer: The flexible spring ( x2 ) was compressed more than the stiff spring ( x1 ). ( E )

The crust on Mercury is younger than the crust on Mars or Venus.

option D.

If the evidence that the crust on Mercury is younger than the crust on Mars or Venus is found to be true, it would disprove the current theory of Mercury's formation.

The current theory proposes that Mercury was formed from the solar nebula, which led to the differentiation of its core and mantle. This theory suggests that Mercury's crust should be older than that of Mars or Venus since Mercury is the closest planet to the Sun and should have formed first.

Therefore, if it is discovered that the crust on Mercury is younger than the crust on Mars or Venus, it would be inconsistent with the current theory of Mercury's formation.

A, B, and C are not relevant to Mercury's formation theory as they do not directly relate to the processes that occurred during the planet's formation.

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Answer:

A-certain impact crators on the surface of Mercury are as old as the planet itself.

Explanation:

Edmentum

From conservation of energy, the potential energy will begin to reduce as soon as it starts to fall to the ground to gain kinetic energy.

Conservation of energy state that energy can not be created nor destroyed but can only be transformed from one form to another.

Given that a football is punted to its maximum height. At this maximum height, the kinetic energy is zero while the potential energy is maximum.

As soon as it starts to fall to the ground it starts to gain kinetic energy. And what will happen to the potential energy of the football as it starts to gain kinetic energy is the reduction of the potential energy.

Therefore, the potential energy will begin to reduce as soon as it starts to fall to the ground to gain kinetic energy.

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Answer:

2.4 m/s". 1

Explanation:

A jet with mass m = 8 x 10* kg jet accelerates down the runway for takeoff at 2.4 m/s". 1

Kinetic Energy is the energy that a moving object has by virtue of its motion. It is given by the formula:KE = 1/2mv²where m is the mass of the object and v is its velocity.

The mass of the roller coaster is given as 500 kg, and its velocity is 10 m/s,

The kinetic energy of the roller coaster can be calculated as follows:

\(KE = \frac{1}{2} mv²KE = \frac{1}{2} \times 500 kg x (10 m/s)²\)

\(KE = \frac{1}{2} \times 500 kg \times 100 m^2/s^2KE = 50,000 J\)

Therefore, the kinetic energy of the roller coaster is 50,000 J or 5 x 10⁴ J.

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Answer:

equator

Explanation:

in south & north pole you could have 20+ hours daylight or night, everyday!

Calculate the electric potential of a spherical (conducting) shell of radius 0.20 m carrying

a charge of 4.0 × 10–4 C.​

Explanation:

Answer:

yes friction is needed hope this helps might of been to long tho

Answer:

A

Explanation:

Fussion occurs when elements of lower atomic mass combines to form that of a larger atomic mass, releasing energy in the process .

Hydrogen has a lower atomic mass than Helium.

The return of a wave from a surface is known as reflection. When a wave encounters a surface, some or all of the wave energy may bounce back from the surface. This is known as reflection. The reflected wave can then interact with other waves in the environment, leading to phenomena such as interference, diffraction, and standing waves.

Answer:

The first is the closest in absolute values.

The second two are vague and the last is approximate.

Answer:

3.04 m ???

Explanation:

The wavelength of the signal from  KPhET 98.7 radio station is 3.05 meter.

EM waves are another name for electromagnetic waves. When an electric field interacts with a magnetic field, electromagnetic waves are created. These electromagnetic waves make up electromagnetic radiations.

It is also possible to say that electromagnetic waves are made up of magnetic and electric fields that are oscillating. The basic equations of electrodynamics, Maxwell's equations, have an answer in electromagnetic waves.

As radio wave is electromagnetic wave, the speed of radio wave is 3.0×10⁸ m/s.

Given frequency of KPhET  is 9.87 x10⁷ Hz.

Hence, the wavelength of the signal from this radio station is = ( velocity ÷ frequency)

= 3.0×10⁸ m/s ÷  9.87 x10⁷ Hz.

= 3.05 meter.

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When a negatively charged conducting rod is brought near a light polystyrene ball suspended from the ceiling by an insulating thread (as shown in Diagram A), the electrons in the ball are repelled by the negative charge on the rod.

This causes the electrons in the ball to move away from the rod and distribute themselves unevenly throughout the surface of the ball. As a result, the side of the ball closest to the rod becomes positively charged, while the opposite side becomes negatively charged.

When the ball touches the negatively charged rod (as shown in Diagram B), the negatively charged electrons in the rod repel the negatively charged electrons in the ball, causing them to move away from the point of contact. This creates an imbalance of charges on the ball's surface, with an excess of positive charges on one side and negative charges on the other.

As a result of this charge imbalance, the ball experiences an electrostatic force, which causes it to move vertically away from the rod. The direction of the displacement depends on the relative magnitudes of the electrostatic force and the weight of the ball. If the electrostatic force is stronger than the weight of the ball, the ball will move upward. If the weight of the ball is stronger than the electrostatic force, the ball will move downward. In either case, the ball will be displaced vertically.

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A VfL (Vertical Field LED) backlighting system is commonly used in LCD (Liquid Crystal Display) televisions.

LCD TVs rely on a backlight to illuminate the liquid crystal layer, which controls the passage of light to create the visual image. The VfL technology is a specific type of LED backlighting arrangement used in certain LCD TV models. In a VfL backlighting system, the LEDs (Light-Emitting Diodes) are positioned vertically along the edges of the LCD panel.

The light emitted by these LEDs is directed across the panel using light guides or optical films, illuminating the liquid crystal layer uniformly. One advantage of VfL backlighting is its ability to provide consistent illumination across the LCD panel, reducing any potential inconsistencies in brightness or color uniformity. The vertical orientation of the LEDs allows for more precise control over light distribution, improving overall image quality.

Additionally, VfL backlighting offers potential advantages in terms of power efficiency. By selectively dimming or turning off specific zones of LEDs, local dimming techniques can be employed to enhance contrast and black levels, resulting in improved picture quality while conserving energy. It's important to note that VfL backlighting is just one of several backlighting technologies available for LCD TVs.

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The velocity of ball B after impact would be2.7147 i + 2.6987 j ft/s

To solve this problem, we can use the conservation of momentum and energy.

First, let's find the momentum of ball A before the collision. The momentum is given by:

p = mv

The mass of each ball is the same, so we can write:

p_A = mV_A

where V_A is the velocity vector of ball A.

We can break V_A into its x and y components as follows:

V_Ax = V_A cos(θ)

V_Ay = V_A sin(θ)

where θ is the angle between the velocity vector and the x-axis.

Substituting in the given values, we get:

V_Ax = 3 cos(70°) = 0.9063 ft/s

V_Ay = 3 sin(70°) = 2.8830 ft/s

So, the momentum of ball A before the collision is:

p_A = mV_A = m (V_Ax i + V_Ay j) = m (0.9063 i + 2.8830 j) lb·ft/s

Next, we need to find the velocity of ball A after the collision. We can use conservation of momentum and energy to do this.

p_A + p_B = p_A' + p_B'

where p_B is the momentum of ball B before the collision, and p_A', p_B' are their respective momenta after the collision.

Since ball B is initially at rest, its momentum before the collision is zero:

p_B = 0

Conservation of energy tells us that the total kinetic energy of the system before the collision is equal to the total kinetic energy of the system after the collision:

1/2 m V_A^2 = 1/2 m V_A'^2 + 1/2 m V_B'^2

where V_A' and V_B' are the velocities of the balls after the collision.

We can use the coefficient of restitution (e) to relate the velocities of the balls before and after the collision:

e = (V_B' - V_A') / (V_A - V_B)

Substituting in the given values, we get:

e = (V_B' - V_A') / (3 - 0)

Solving for V_B', we get:

V_B' = e (V_A - V_B) + V_A'

Substituting in the known values, we get:

V_A' = (0.9063 i + 2.8830 j) ft/s

e = 0.9

Solving for V_B', we get:

V_B' = e (V_A - V_B) + V_A'

= 0.9 (3 i + 0 j) + (0.9063 i + 2.8830 j)

= 2.7147 i + 2.6987 j ft/s

So, the velocity of ball B after the collision is:

V_B' = 2.7147 i + 2.6987 j ft/s

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Answer:

gravitation

good luck, hope this helps :)

We will have the following:

The equivalent resistance is given by:

So, the equivalent resistance is approximately 7.87 Ohms.

Answer:

This problem involves the concept of a random walk, which is a mathematical model of a path consisting of a succession of random steps.

The question asks for the distance, R(n), from the center of a star after n steps of a photon, assuming a 2D random walk.

The random walk in two dimensions has a step length of A_i and the direction of the steps is uniformly distributed in [0, 2π). The change in position after each step can be written in Cartesian coordinates (Δx, Δy), where Δx = A_i cos(θ_i) and Δy = A_i sin(θ_i).

The displacement from the center after n steps is given by the vector sum of all the individual steps. This vector sum can be written in terms of its Cartesian coordinates, (X, Y), where X = Σ Δx and Y = Σ Δy. This sum over n random vectors is itself a random variable. The net displacement R(n) from the center of the star after n steps is given by the magnitude of the net displacement vector:

R(n) = √(X² + Y²)

Because each step is independent and has a random direction, the expected value of the cosine and sine for any step is zero. This means that the expected values of X and Y are both zero.

However, the mean square displacement is not zero. Because the steps are independent, the mean square displacement in each direction is additive. For a 2D random walk:

<X²> = Σ <(Δx)²> = n <(A cos θ)²> = n A²/2

<Y²> = Σ <(Δy)²> = n <(A sin θ)²> = n A²/2

Because <X²> = <Y²>, we can write:

<R²> = <X²> + <Y²> = n A²

So, the root mean square distance (the square root of the mean square displacement) after n steps is:

R(n) = √(<R²>) = √(n) * A

Therefore, the distance R(n) that the photon is expected to be from the center of the star after n steps grows as the square root of the number of steps, with each step having a length A. Please note that this result holds for a 2D random walk. A real photon in a star would be performing a 3D random walk, which would have slightly different characteristics.

10 ms^-2 is acceleration due to gravitational force

mass = 150kg

force ( weight of the man ) = mass × acceleration due to gravitational force (g)

weight = 150kg × 10ms^-2 = 1500 kg/ms² ( N )

\(10 ms {}^{ - 2}\)is acceleration due to gravitational force

mass = 150kg

force (weight ) = mass × gravitational force

weight = 150kg × \(10ms {}^{ - 2}\) = 1500 kg/ms²

a) , it would take approximately 0.4638 seconds for the magnetic energy to decay to 13% of its maximum value.. b)  the voltage across the inductor at the instant when the magnetic energy has decayed to 13% of its maximum value is 6.4 times the initial current in the circuit.

An RL circuit consists of a resistor (R) and an inductor (L) connected in series. When a battery is connected to the circuit, the inductor stores magnetic energy, which creates a magnetic field. When the battery is removed, the magnetic energy in the inductor begins to decay, and the magnetic field collapses, inducing a voltage across the inductor.

a) The time constant (τ) of an RL circuit is given by the formula:

τ = L/R

where L is the inductance in henries, and R is the resistance in ohms. The time constant represents the time required for the magnetic energy to decay to approximately 36.8% of its maximum value.

In this case, L = 5 H and R = 22 ohms. Therefore, the time constant of the circuit is:

τ = L/R = 5 H / 22 ohms = 0.2273 seconds

To calculate the time required for the magnetic energy to decay to 13% of its maximum value, we can use the formula:

t = -ln(0.13) * τ

where ln is the natural logarithm. Plugging in the values, we get:

t = -ln(0.13) * 0.2273 seconds

t = 0.533 seconds

Therefore, it would take approximately 0.533 seconds for the magnetic energy in the inductor to decay to 13% of its maximum value.

b) To find the voltage across the inductor at that instant, we can use the formula:

V = L * di/dt

where V is the voltage across the inductor, L is the inductance, and di/dt is the rate of change of the current in the circuit.

At the instant when the magnetic energy in the inductor has decayed to 13% of its maximum value, the current in the circuit is given by:

I = I0 * e^(-t/τ)

where I0 is the initial current, and e is the mathematical constant approximately equal to 2.71828. Plugging in the values, we get:

I = I0 * e^(-0.533/0.2273)

I = 0.292 * I0

Therefore, the rate of change of current (di/dt) at that instant is given by:

di/dt = I / τ = (0.292 * I0) / 0.2273

Now, we can calculate the voltage across the inductor:

V = L * di/dt = 5 H * (0.292 * I0 / 0.2273)

V = 6.4 * I0 volts

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According to the Keynesian view, manipulating foreign sector spending is not a reliable way to move the U.S. economy toward a more acceptable equilibrium because it does not address the fundamental causes of economic instability.

Keynesian economics focuses on the role of domestic demand in driving economic growth and stability. The government can use fiscal and monetary policy to stimulate aggregate demand and promote full employment. However, changes in foreign sector spending can be unpredictable and beyond the control of domestic policymakers. For instance, an increase in foreign demand for U.S. exports could boost economic growth and employment in the short run, but it may not be sustainable if the foreign demand later decreases. Similarly, a decrease in foreign demand for U.S. exports could have negative short-term effects on the economy, but it may not necessarily lead to a long-term decline. In short, Keynesian economics emphasizes the importance of domestic demand management and stabilizing the economy through government intervention. While changes in foreign sector spending can have some impact on the economy, they are generally seen as unreliable and unpredictable, and therefore not a reliable tool for achieving economic stability in the long run.

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Answer:

A turbine and generator produce the electricity

Explanation:

"A hydraulic turbine converts the energy of flowing water into mechanical energy. A hydroelectric generator converts this mechanical energy into electricity.