Two friend in France use a pendulum hanging form the world's highest railroad bridge to exchange messages across a river. One friend attaches a letter to the end of the pendulum and releases it so that the pendulum swings across the river to the other friend. Tha brig=dge is 130.0 m above the river. How much time is needed for the letter to make one swing across the river? Assume the river is 16.0 m wide.

Answer:

I get up at 5 in the morning exercise then take a shower then go back to sleep till it's time to eat breakfast and go to school. Then at 7 or 8 o clock pm after i eat dinner at 5 i exercise at 7 then take a shower and then go to bed i do this everyday.

Explanation:

Getting off the couch or out of your seat to start walking, running, bicycling, swimming or other activity may help you lead a healthier and happier life. ... Those activities can include walking briskly, gardening, bicycling slowly or even ballroom dancing.

The integral of 1/(1 + x²) is (1/2)ln|1 + x²| + C where C is the constant of integration.

Integration is a mathematical process of finding the antiderivative of a function. To integrate the given expression 1/(1 + x²), we will use the substitution method.

Let u = 1 + x², du/dx = 2x dx, then dx = du/2x and the integral becomes:

∫1/(1 + x²) dx = ∫1/u * (1/2x) du= (1/2)∫1/u du

The antiderivative of 1/u is ln|u| + C, where C is the constant of integration.

Therefore, the final solution of the integral is (1/2)ln|1 + x²| + C.

Let us work through the steps:

Step 1:Let u = 1 + x² and then differentiate both sides with respect to x to obtain du/dx. du/dx = 2x

Substitute 2x dx = du into the integral ∫1/(1 + x²) dx to get the integral in terms of u:∫1/u * (1/2x) du = (1/2) ∫1/u du

Step 2:Calculate the antiderivative of 1/u, which is ln|u|. Thus, the final solution is (1/2)ln|1 + x²| + C, where C is the constant of integration. The constant C will vary depending on the initial conditions of the problem.

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Answer:

incompressible and expandable

First, calculate the partial pressure of H2 by considering the total pressure:

where,

Ptot = 1.1bar

PH20 = 150Torr

Convert the previous values to atm:

Ptot = 1.1 bar = 1.085 atm

PH20 = 150 Torr = 0.197 atm

Then, for PH2 you obtain:

Next, use the following equation for ideal gases:

where,

V: volume = 55.65mL = 0.05565 L

R: gas constant = 0.082 atm*L/mol*K

T: temperature = 60 + 273 = 333K

P: partial pressure of H2 = 0.888atm

Solve the equation for n and replace the values of the other parameters:

Next, use the atomic weight to determine the mass of H2:

Hence, there are 0.0036 g of H2 collected above the water

A typical shooting star in a meteor shower is caused by a meteor entering Earth's atmosphere.

A shooting star, also known as a meteor, is caused by a small piece of interplanetary debris, called a meteoroid, entering the Earth's atmosphere at high speed. As the meteoroid enters the atmosphere, it rapidly compresses the air in front of it, creating a shock wave that heats up the meteoroid and the surrounding air.

This produces a bright, glowing trail of ionized gas, which we see as a shooting star. Most meteoroids burn up completely in the atmosphere due to the extreme heat generated by friction with the air molecules. However, if a large enough meteoroid survives atmospheric entry and reaches the ground, it is then called a meteorite. Meteor showers occur when the Earth passes through the debris trail left by a comet or asteroid.

Thus, a typical shooting star in a meteor shower is caused by a meteor entering Earth's atmosphere.

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The water-pool mirage commonly seen on roadways is described as: "It is due to light from the sky that is refracted upward to an observer by a layer of hot air" (option a).

The water-pool mirage, also known as the highway mirage, is a visual phenomenon that occurs on hot days when there is a layer of hot air just above the surface of the road. This layer of hot air causes the light from the sky to bend or refract upward, creating the illusion of a shiny surface on the road.

This illusion can be so convincing that it appears as if there is a pool of water on the road, leading some drivers to take evasive action to avoid it. In reality, there is no actual water on the road, but rather an optical illusion caused by the bending of light.

Option a is answer.

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Answer:

The work remains the same

Please mark as brainliest

Answer:

The correct answer is B

steadily along a uniform flow tube of cross section area 20cm². The total pressure is 3x104pa and static pressure is 2.5x104 pa. Calculate the velocity of the fluid.

22 days from now the star Betelgeuse, of the constellation Orion will rise at 11:40 pm

Given that,

Time at which the star rises today = 1:12 am

The stars rise about 4 minutes earlier each night

Minutes earlier it will rise 22 days from now = 4 * 22 = 88 minutes

= 1 Hr 28 Min

The star should rise 1 Hr 28 Min earlier from 1:12 am which is 11:44 pm

But since the time from today to 22 days from now crosses the 12 am mark, the star will be seen twice on the same day. This means that the star seen on 11:44 pm is actually on the 21st day. On 22nd day the star is seen 4 minutes earlier than 11 pm which is 11:40 pm.

We rotate one degree every 4 minutes. We revolve a little more than 1 degree every day around the sun (365 days divided by 360 degrees is 1.014 degrees). So everyday we get to see the star 4 minutes early which is 1 degree.

Therefore, 22 days from now the star Betelgeuse, of the constellation Orion will rise at 11:40 pm

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Answer:

Focal length

Explanation: No need for one...

Focal length  is unnecessary to include when accurately drawing ray diagrams.

The focal length is the distance, in millimeters, between the lens' optical center and the camera sensor, which records light data.

The elements inside the housing of a lens bend and shape light as it enters the front so that it converges into a single point of focus known as the "optical center."

It is crucial to remember that this measurement is made with the camera set to infinity and that lenses are named according to their focal length, which is indicated on the lens' barrel.

Therefore, Focal length  is unnecessary to include when accurately drawing ray diagrams.

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Answer:

0.25

Explanation:

Due to the spin of an electron S, orbital angular momemtum I is not sufficient to explain the behavior of an atom, for the given orbital quantum number l = 1, the possible values of the total angular quantum number j are 3/2 and 1/2.

The allowable combinations of the orbital quantum number l and the spin quantum number s may be used to calculate the possible values of the total angular quantum number j.

Here,

Orbital quantum number l = 1

The total angular momentum quantum number:

j = |l + s| - 1

j = |1 + s| - 1

j = |1 + 1/2| - 1 = 3/2

For,

s = -1/2:

j = |1 - 1/2| - 1 = 1/2

Thus, for the given orbital quantum number l = 1, the possible values of the total angular quantum number j are 3/2 and 1/2.

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The equation for the plane through the point p0=(6,4,5) and normal to the vector b=3i 5j 9k is 3x + 5y + 9z = 83.

To find the equation of the plane through point p0(6, 4, 5) and normal to the vector B = 3i + 5j + 9k, follow these steps:
1: Write the general equation for a plane.
The general equation for a plane is Ax + By + Cz = D, where A, B, and C are the coefficients of the normal vector and D is a constant.
2: Identify the coefficients from the normal vector.
The normal vector B is given by 3i + 5j + 9k, so A = 3, B = 5, and C = 9.
3: Substitute the point p0 into the general equation of the plane.
3(6) + 5(4) + 9(5) = D
18 + 20 + 45 = D
83 = D
4: Write the equation of the plane.
The equation of the plane is 3x + 5y + 9z = 83.

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Explanation:

d= 80km = 8000m

t = 45 min = 45/60 h

= 0.75 h

V= ?

we know that,

V = d /t

or,V= 80 km / 0.75 h

or,V= 106.67×1000m / 3600 s

2. or, V= 29.63 m/s

Respuesta: T2 = 131.04K

Explicación: Dado lo siguiente:

Presión, P1 = 1.5 atm = 1.5 × 760 = 1140 mmHg

Presión, P2 = 1.2 atm = 1.2 × 760 = 912 mmHg

Volumen, V1 = 500cm3 Volumen, V2 = 300cm3

Temperatura, T1 = 273K Temperatura, T2 =?

Usando la fórmula de gas combinada:

P1V1 / T1 = P2V2 / T2

Ingresando nuestros valores:

(1140 × 500) / 273 = (912 × 300) / T2

T2 × (1140 × 500) = 912 × 300 × 273

T2 = 74692800/570000 T2 = 131.04K

The image given, is explained in terms of Newton's 1st law of motion.

Based on Newton's First Law of Motion (Inertia).  An object at rest remains at rest, and an object in motion continues in motion at a steady speed and in a straight path until operated on by an unbalanced force.

Newton's first rule of motion states that if a pan of water were being moved along a track, the water would tend to keep moving ahead. However, the water will appear to splash to the right while it goes to the left. Space is nearly a perfect vacuum, devoid of both gravity and matter. Think about a satellite travelling 17,500 mph around the Earth. If a rock were to be launched from the satellite, it would orbit the earth adjacent to the satellite at a speed of 17,500 mph.

Here, in the given image, it is shown that the sofa is remain in the place unless a person forcefully move it from one place to another.

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Answer:

\(v_c_a_n_o_e=-1.6m/s^{2}\)

Explanation:

You can use the equation of the conservation of momentum. We find that the velocity of the canoe is -1.6m/s².

\(m_1v_1+m_2v_2=0\\(49)(1.5)+(46)(v_c_a_n_o_e)=0\\73.5 + 46v_c_a_n_o_e=0\\46v_c_a_n_o_e = -73.5\\v_c_a_n_o_e = -73.5/46 = -1.6m/s^{2} \\\)

Hello!

We can begin by using the Work-Energy theorem. The initial energy is the kinetic energy of the combined mass of the bullet and suspended object, while the final energy is the GPE of the combined objects.

In equations:
\(E_i = \frac{1}{2}mv^2\\\\E_f = mgh\)

m = combined mass of the bullet and suspended object (0.5 kg)
v = velocity of block system after struck (? m/s)
g = acceleration due to gravity (10 m/s²)

h = final height of combined objects (1.8 m)

Set the two equal (Conservation of Energy) and solve for velocity.\(\frac{1}{2}mv^2 = mgh \\\\\frac{1}{2}v^2 = gh \\\\v^2 = 2gh \\\\v = \sqrt{2gh}\\\\v = \sqrt{2(10)(1.8)} = 6 \frac{m}{s}\)

Now, we can use the conservation of linear momentum to solve.

Recall that:
\(p_i = p_f\)

For an inelastic collision (objects stick together):

\(m_1v_1 + m_2v_2 = (m_1 + m_2) v_f\)

Let m1 represent the bullet and m2 represent the suspended object.

Initially, the suspended object has no velocity, so v2 = 0. Therefore:

\(m_1v_1 = (m_1 + m_2)v_f\\\\v_1 = \frac{(m_1 +m_2)v_f}{m_1}\\\\v_1 = \frac{(0.5)(6)}{0.05} = \boxed{60 \frac{m}{s}}\)

Answer:

Fossil fuels store energy from the sun as

Explanation:

Answer:

Rate of Reaction of B is more.

Explanation:

Rate of reaction  refer to the speed at which product are formed.

A is completed in 57 seconds and reaction B is completed in 48 seconds

therefore reaction b speed is more. Therefore rate of Reaction of B is more.

Answer:

Active stretching.

Explanation:

Think about it.

A 1200-kg car moving on a horizontal surface has speed when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.2 m.   Spring stiffness constant of the spring k = 138440 N/m .

Given mass of car =1200

speed of the car is 85 km/h = 23.63 m/s

K.E = 1/2 mv²

using spring energy formula

KE spring = 1/2kx²

using conservation of energy

1/2 mv² =  1/2kx²

k= mv²/x²

k= 1200×23.63²/2.2²

therefore k = 138440 newtons/meter

In contrast to velocity, which describes the speed and direction of an object's movement, speed is the rate of movement along a path. Alternatively, velocity is a vector while speed is a scalar quantity. It takes both magnitude and direction to define velocity, a physical vector quantity. The rate of movement in a specific direction is known as velocity. An object's velocity encompasses both its speed and its direction of motion. An object's speed is defined as the rate at which its location changes. The acceleration is determined by the velocity change rate of the object.

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A battery is an electrochemical device that generates electricity from a chemical reaction. It typically consists of two electrodes, an anode and a cathode, separated by an electrolyte, which is a solution or medium that conducts ions.

The chemical reaction between the electrodes and the electrolyte generates a flow of electrons, which can be harnessed to power electrical devices.The flow of electrons generated by the chemical reaction in a battery is a one-way process and cannot be reversed. When the battery is connected to a circuit, the electrons flow from the anode to the cathode, producing an electrical current.

However, the reverse flow of electrons, from the cathode to the anode, cannot be achieved by simply reversing the direction of the current. This is because the chemical reaction that generates the flow of electrons is not reversible.Different types of batteries use different chemical reactions to generate electricity. For example, alkaline batteries use zinc as the anode and manganese dioxide as the cathode, while lead-acid batteries use lead as the anode and cathode and sulfuric acid as the electrolyte.

Lithium-ion batteries, which are commonly used in portable electronic devices, use lithium ions as the charge carriers and graphite as the anode.In conclusion, a battery is an electrochemical device that generates electricity from a chemical reaction and cannot be run in reverse. The chemical reaction is a one-way process that generates a flow of electrons from the anode to the cathode, producing an electrical current that can be used to power electrical devices.

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Given,

The initial frequency of the heartbeat, f₁=1.45 Hz

The increased heartbeat, f₂=1.55 Hz

The frequency of the heartbeat can be described as the number of occurence of the heartbeat per second. That is every second, the heart beats 1.45 times.

(a)

Thus for a minute, the number of the heartbeats is,

Thus 87 beats occur for a minute.

(b)The increase in the frequency of the heartbeat implies the increase in the number of the heartbeat for every second. And hence the beats in a minute increase when the frequency of the heartbeat increases.

(c)

The number of the beats per minute after the increase of the frequency is,

Thus after the increase in the frequency, 93 beats occur in a minute.