48. Calculate reflection coefficient for a downward P-wave reflected at the interface between two layers. Upper layer 1 has density = 2800 kg/m³ and P-wave velocity = 3.0 km/s, and Lower layer 2 has density = 2600 kg/m³ and P-wave velocity = 2.8 km/s.
ANSWER_________

Answer:

The color

Explanation:

The color lets you see things more brightly because of what's in it that incandescent lightbulbs don't have.

Answer:

LED lightbulbs don't give off a lot of heat unlike incandescent lightbulbs. LED are also efficient in the consumption of energy.  Incandescent lightbulbs use alot of power to produce the amount of light an LED lightbulb produces.

As the temperature of a sample of water approaches 0 K, particles of water slow down and form a solid. Option B

This process is known as solidifying or hardening, and it happens when the temperature of a substance is brought down to the point where the warm thermal energy of the particles isn't sufficient to keep them in a fluid state.

At this point, the particles start to bond together to create a crystalline strong, which is what we commonly allude to as ice.

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Answer: 1.72J

Just figured this out a while ago

Answer:

B) 15 m/s

Explanation:

Since most of the answer choices are in m/s, you can try dividing 60 meters/4 seconds in order to get the seconds on the bottom to become 1 second.

You want to find how many meters the object can travel in 1 second, rather than 4 seconds.

Now you can see that for every 1 second of time, the object can travel 15 meters. This corresponds to answer choice B) 15 m/s.

The last option, D, is incorrect because we are not dealing with hours as our unit of time. We are dealing with seconds.

Answer:

b) 15 m/s

hope it help you

Answer:

RESISTANCE=(4+8+12)Ohms

=24 ohms

V=IR

24= I ×24

I= 24/24

I= 1 A

CURRENT IS 1 A

Answer:

resistanceeeeeeeeeeeeeeeeeee

The intensity on a screen 20 ft from the light will be 0.125-foot candles.

Distance is a numerical representation of the length between two objects or locations.

The intensity I of light varies inversely as the square of the distance D from the source;

I∝(1/D²)

The ratio of the intensity of the two cases;

\(\rm \frac{I_1}{I_2} =(\frac{D_2}{D_1} )^2\\\\ \rm \frac{2}{I_2} =(\frac{20}{5} )^2\\\\ \frac{2}{I_2} =4^2 \\\\ I_2= \frac{2}{16} \\\\ I_2= 0.125 \ foot-candles\)

Hence, the intensity on a screen 20 ft from the light will be 0.125 foot-candles

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Answer:

\(5.7 g/cm^{3}\)

Explanation:

ρ = 8.0 g/\(1.4 cm^{3}\) = \(5.7 g/cm^{3}\)

\(\qquad\qquad\huge\underline{{\sf Answer}}\)

According to first law of reflection, we know that :

Angle made by the incident ray and normal [ i.e angle of incidence ] is always equal to Angle made by the reflected ray and normal [ i.e Angle of reflection ]

Therefore, we can say that the missing angle (angle of reflection) has the same value as the angle of incidence which is equal to 45°

Please read the statement through to understand the procedure ~

It will take an additional 7.33 minutes for the cake to cool from 200 degrees F to 90 degrees F after the initial 10 minutes of cooling.

To calculate how much longer it will take for the cake to cool to 90 degrees F, we need to first determine the rate at which the cake is cooling. We can do this by calculating the temperature difference between the cake and the room and dividing it by the time it takes for that temperature difference to occur.
In this case, the temperature difference between the cake and the room is 280 degrees F (350-70=280) when the cake is removed from the oven. After 10 minutes, the temperature difference is 130 degrees F (200-70=130). Therefore, the cake is cooling at a rate of 15 degrees F per minute (280-130=150 degrees F in 10 minutes; 150/10=15).
To determine how much longer it will take for the cake to cool to 90 degrees F, we need to calculate the time it takes for the temperature to drop from 200 degrees F to 90 degrees F. This is a temperature difference of 110 degrees F (200-90=110), so it will take approximately 7.33 minutes (110/15=7.33) for the cake to cool from 200 degrees F to 90 degrees F.

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Answer:

a) Electric resistance: The basic dimensions of electric resistance are resistance (R) which has the dimension of [mass] x [length]^2 / [time]^3.

b) Universal Gas Constant: The basic dimensions of the Universal Gas constant (R) are [energy]/[temperature x amount of substance]. These dimensions can be expressed as [mass] x [length]^2 / [time]^2 / [temperature] x [amount of substance].

Explanation:

Answer:

Force(Romeo moving) = 5,000 N

Explanation:

Given:

Mass of horse = 900 kg

Acceleration = 20 km/hr

Find:

Force(Romeo moving)

Computation:

Acceleration = 20 km/hr

Acceleration in m/s = 20 / 3.6 = 5.555556 m/s²

Force = m x a

Force(Romeo moving) = 900 x 5.555556

Force(Romeo moving) = 5,000 N

Answer:

As a result, if the field lines are close together (that is, the field line density is greater), this indicates that the magnitude of the field is large at that point. If the field lines are far apart at the cross-section, this indicates the magnitude of the field is small. (Figure) shows the idea.

Explanation:

Answer:

in your mind yes but the bread is smaller than the earth thus it wouldnt turn the earth into a sandwich.

Answer:

The magnetic field at point P midway between the two wires is zero. This is because the magnetic fields produced by the two wires are equal in magnitude but opposite in direction, so they cancel each other out at point P.

Explanation:

Answer:

4 m/s

Explanation:

you moved 140 meters in 35 seconds

v = 140 / 35 = 4 m/s

Answer:

See Explanation

Explanation:

m1(v1) + m2(v2)

Opposite turns the plus to subtraction.

80(8) - 120(4.0)

60 - 480 = 160 kg m/s to the right

An 80-kg football player travels to the right at 8 m/s and a 120-kg player on the opposite team travels to the left at 4.0 m/s. The total momentum is 160 kg m/s.

Momentum is a fundamental concept in physics that describes the amount of motion an object has. It is defined as the product of an object's mass and its velocity. Mathematically, momentum (p) is given by:

p = m × v

where p is the momentum, m is the object's mass, and v is its velocity.

The units of momentum are kilogram-meters per second (kg m/s) in the SI system of units. The direction of momentum is the same as the direction of the object's velocity.

Momentum is a conserved quantity, meaning that the total momentum of an isolated system (a system that does not interact with its surroundings) remains constant. This is known as the law of conservation of momentum, and it has many practical applications in physics and engineering. For example, it can be used to analyze collisions between objects, such as in sports or automobile accidents.

Here in the Question,

To find the total momentum of the two players, we first need to calculate the individual momentum of each player, and then add them up.

The momentum (p) of an object is given by the product of its mass (m) and velocity (v):

p = m × v

For the first player with a mass of 80 kg and a velocity of 8 m/s, the momentum is:

p1 = 80 kg × 8 m/s = 640 kg m/s

For the second player with a mass of 120 kg and a velocity of -4.0 m/s (negative because he is traveling in the opposite direction), the momentum is:

p2 = 120 kg × (-4.0 m/s) = -480 kg m/s

The negative sign in front of the momentum for the second player indicates that his momentum is in the opposite direction of the first player.

To find the total momentum, we add the individual momenta:

total momentum = p1 + p2

= 640 kg m/s - 480 kg m/s

= 160 kg m/s

Therefore, the total momentum of the two players is 160 kg m/s.

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​

Answer:

a) 0.60 kg cart has final velocity 3.0 m/s [E]

0.80 kg cart has final velocity 4.0 m/s [W]

b) 0.12 m

Explanation:

Take east to be positive.

a) Momentum is conserved.

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

(0.60) (-5.0) + (0.80) (2.0) = (0.60) v₁ + (0.80) v₂

-1.4 = 0.6 v₁ + 0.8 v₂

Kinetic energy is conserved in elastic collisions.

½ m₁u₁² + ½ m₂u₂² = ½ m₁v₁² + ½ m₂v₂²

m₁u₁² + m₂u₂² = m₁v₁² + m₂v₂²

(0.60) (-5.0)² + (0.80) (2.0)² = (0.60) v₁² + (0.80) v₂²

18.2 = 0.6 v₁² + 0.8 v₂²

Solve the system of equations.

-1.4 = 0.6 v₁ + 0.8 v₂

-1.4 − 0.6 v₁ = 0.8 v₂

-1.75 − 0.75 v₁ = v₂

18.2 = 0.6 v₁² + 0.8 (-1.75 − 0.75 v₁)²

18.2 = 0.6 v₁² + 0.8 (3.0625 +2.625 v₁ + 0.5625 v₁²)

182 = 6 v₁² + 8 (3.0625 + 2.625 v₁ + 0.5625 v₁²)

182 = 6 v₁² + 24.5 + 21 v₁ + 4.5 v₁²

0 = 10.5 v₁² + 21 v₁ − 157.5

0 = v₁² + 2 v₁ − 15

0 = (v₁ − 3) (v₁ + 5)

v₁ = 3 or -5

Since u₁ = -5.0 m/s, v₁ must be 3.0 m/s.

Solving for v₂:

v₂ = -0.75 v₁ − 1.75

v₂ = -4.0 m/s

b) The compression of the spring is a maximum when the carts have the same velocity.

Momentum is conserved.

m₁u₁ + m₂u₂ = (m₁ + m₂) v

(0.60) (-5.0) + (0.80) (2.0) = (0.60 + 0.80) v

-1.4 = 1.4 v

v = -1.0

Energy is conserved.

½ m₁u₁² + ½ m₂u₂² = ½ (m₁ + m₂) v² + ½ kx²

m₁u₁² + m₂u₂² = (m₁ + m₂) v² + kx²

(0.60) (-5.0)² + (0.80) (2.0)² = (0.60 + 0.80) (-1.0)² + (1200) x²

18.2 = 1.4 + 1200 x²

16.8 = 1200 x²

x² = 0.014

x = 0.12

Answer:

:)

Explanation:

The moon is about 384,400 km away from the Earth.

We can use trigonometry to calculate the distance from the Earth to the Moon, given its diameter and the angle it subtends when viewed from the Earth's surface.

Let's first calculate the distance between the observer on the Earth's surface and the point directly below the center of the Moon. This distance is equal to the radius of the Earth, which is approximately 6,371 km.

Next, we can use the angle subtended by the Moon to calculate the distance from the observer to the Moon. We can use the formula:

distance = radius / tan(angle)

where distance is the distance from the observer to the Moon, radius is the radius of the Earth, and angle is the angle subtended by the Moon.

Converting the Moon's diameter to meters, we have:

diameter = 3.47 x 10⁶ m

The radius of the Moon is half of its diameter, so:

radius = diameter / 2 = 1.735 x 10⁶ m

Converting the angle subtended by the Moon to radians, we have:

angle = 0.00904 rad

Plugging in these values, we get:

distance = 6,371 km / tan(0.00904 rad) = 384,400 km

Therefore, the distance from the Earth to the Moon is approximately 384,400 km.

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Given :

Initial velocity, u = 12.5 m/s.

Height of camera, h = 64.3 m.

Acceleration due to gravity, g = 9.8 m/s².

To Find :

How long does it take the camera to reach the ground.

Solution :

By equation of motion :

\(h = ut+\dfrac{gt^2}{2}\)

Putting all given values, we get :

\(12.5t+\dfrac{9.8t^2}{2}=64.3\\\\4.9t^2+12.5t=64.3\)

t = 2.56  and t = −5.116.

Since, time cannot be negative.

t = 2.56 s.

Therefore, time taken is 2.56 s.

Hence, this is the required solution.

The new electrostatic force when the charges are 0.05 meters apart will be 4F.

Hence, the correct option is C.

The electrostatic force between two point charges is inversely proportional to the square of the distance between them. This relationship is described by Coulomb's Law:

F = k * (|q1 * q2|) / \(r^{2}\)

Where:

F is the electrostatic force.

k is the electrostatic constant, approximately equal to \(8.988 * 10^9 N m^2/C^2.\)

|q1 * q2| is the product of the magnitudes of the two charges.

r is the distance between the charges.

Let's consider the given scenario. When the charges are initially placed 0.1 meters apart, the electrostatic force is F. Now, when the charges are moved to a distance of 0.05 meters apart, we can calculate the new electrostatic force using the information provided.

According to Coulomb's Law, if we decrease the distance between the charges by a factor of 2, the force between them will increase by a factor of \(2^{2}\) = 4.

Therefore, the new electrostatic force when the charges are 0.05 meters apart will be 4F.

The correct answer is option C) 4F and attracting.

Hence, the correct option is C.

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Distortion at the highest levels of magnification is decreased by (b). the use of immersion oil is correct option.

The fact that magnification does not appear as a variable in any of these equations is significant because specimen resolution is solely determined by numerical aperture and illumination light wavelength. The wavelength of light plays a significant role in the resolution of a microscope, as we have already explained (and can be seen in the calculations).

Therefore, it is preferable to utilize lower magnification objectives with a modest numerical aperture in specimens where resolution is less important and magnifications can be reduced in order to produce images with a greater working distance and greater depth of field.

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Answer:

its the sun bc the sun radiates energy powering these and all electricity makes the earth move

Explanation:

its simply science

It will take about 12 days for the trekkers predict to walk from phakding to Everest base camp.

This is referred to as a form of movement which consists of walking for several days or several weeks and being entirely or partially self-sufficient.

The standard Everest Base Camp Trek is 130km round trip and is usually divided into 12 days which includes time and space for acclimatization to the region and then we have 8 days to get to Everest Base Camp and 4 days to get back which is therefore the reason why ythe predicted days will be 12 and is the correct choice.

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The angular acceleration of the wheel is 3,367.28 rad/s².

The angular acceleration of the wheel is calculated by applying the first kinematic equation as shown below.

ωf² = ωi² + 2αθ

where;

The given parameters include the following;

The angular acceleration of the wheel is calculated as follows;

ωf² = 0 + 2αθ

ωf² = 2αθ

α = ωf² / 2θ

α =  ( 460² ) / ( 2 x 31.42 )

α = 3,367.28 rad/s²

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Answer:

The correct option is energy levels

Explanation:

Rutherford's model of an atom suggests that an atom has a tiny positively charged central mass (now called the nucleus) which is surrounded by electrons (negatively charged) in a cloud-like manner.

Bohr's model went a bit further than the Rutherford's model in describing an atom by suggesting that the electrons which surrounds in the nucleus travel in fixed circular orbits. This description by Bohr was able to describe the energy levels of orbitals which assumes that smallest orbitals have the lowest energy while the largest orbitals have the highest energy.

Answer:

energy levels

hope this helped!

Explanation:

(a) 39 V

(b) 7.8 V

(a) Neglecting the internal resistance of the battery, the voltage drop (V) across the battery is found from Ohm's law as follows;

V = IR                -------------------------(i)

Where;

I = current through the battery

R = total resistance of the circuit.

From the question;

I = 0.75A

R = 52.0Ω

Substitute the values of I and R into equation (i)

=> V = 0.75 x 52.0

=> V = 39Volts

Therefore, the voltage drop across the battery is 39 Volts

(b) Since the set of lanterns is connected in series, then the same current flows through each of the lanterns. Also, since the lanterns are identical, the resistance (\(R_{L}\)) of each of them is given by the total resistance (R = 52.0Ω) divided by the number of lanterns. i.e

\(R_{L}\) = \(\frac{52.0}{5}\)

\(R_{L}\) = 10.4Ω          [Each lantern has a resistance of 10.4Ω]

The current flowing through them is the same as the current (I = 0.75A) flowing the circuit.

Therefore, using Ohm's law, the voltage drop (\(V_L\))across each load (lantern) is

\(V_L\) = I x \(R_{L}\)

\(V_L\) = 0.75 x 10.4

\(V_L\) = 7.8Volts

Therefore, the voltage drop across each load is 7.8 Volts