a boat has a velocity of 8.0 m/s, east. it is crossing a river that is 20.0 m wide. the current in the river flows south at 5.0 m/s. how long will it take the boat to cross the river? how far downstream does it land from its starting point?

Answer:d

Explanation:tsssss

Answer:

Explanation

Give the initial velocity of am object as v =(4m/s)xi+(3m/s)yj

From the expression;

Vy = 3m/s

Vx = 4m/s

At the maximum height, the velocity of the body is zero i.e Vy = 0m/s

The velocity of the projectile as it reaches its highest point will be:

v = (4m/s)xi + 0

v = √4²+0²

v = √16

v = 4m/s

Hence he velocity of the projectile when it reaches its highest point is 4m/s

SinФ = w/l

SinФ = 4.33 / 5.0

Ф = arcsin 4.33/5.0

Ф = 59.99 degrees

Round to 60 degrees

Initially the energy was kinetic energy and in some proportion sound energy. After you stop pushing yourself yo slow down; this means that the kinetic energy is being converted in another kind of energy; the conversion occurring is kinetic energy converting to heat and sound energy, that's why the wheels heat up (get hot) and you hear the sound. All the energy you had eventually transform in those types and you stop.

To sterilise a 50.0-g glass infant bottle, we must increase its heat from 22.0 to 95.0 degrees Celsius, or 3066 J of heat is transferred.

Heat is the result of the movement of kinetic energy within a material or an item, or from form of energy to a material or an object. Electromagnetic energy can be transported using three different mechanisms: radiation, conduction, and convection. Conduction of heat through solids, convection of liquids and gases, and electromagnetic radiation (radiation).

When a substance is subjected to a material-specific phase-change temperature, the material immediately undergoes a phase shift from a solid to a liquid. sources include solar energy, heat pumps, deep geothermal heat pumps, nat gas, lpg (LP), oil, coal, and wood.

50.0 g (0.84 J/g C) of heat was transported (95 C - 22 C)

= 3066 J of heat transferred

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Answer:

Sun, Moon, Earth

Explanation:

A solar eclipse occurs when the moon comes in-between the sun and the earth with all the three bodies in alignment. Thus, the moon prevents the rays of the sun to get to the earth and in its stead, cast a shadow of itself on the earth. The casting of the moon's shadow on the earth creates a region of total darkness (umbra) for certain parts of the earth while some other regions at the periphery of the moon's shadow only experience partial darkness (penumbra).

Hence, beginning with the sun, the correct order of the three bodies during a solar eclipse would be the Sun, the Moon, and then the Earth.

Answer:

Answer:- Volume of the balloon is 5.78 L.

Solution:- There are 0.24 moles of hydrogen gas in a balloon at 35 degree C and 1.05 atm pressure. It asks to calculate the volume of the balloon.

This problem is based on ideal gas law equation:

P = 1.05 atm, n = 0.24 mole, T = 35 + 273 = 308 K

R =

V = ?

The equation could be rearranged for the volume as:

Let's plug in the values and do the calculations to get the volume of the balloon:

V = 5.78 L

So, the volume of the gas balloon is 5.78 L.

Answer:Fossil fuels are formed from the remains of plants and animals that lived millions of years ago. The amount of fossil fuels found in an area is influenced by several tectonic factors, including:

Depositional environment: The type of depositional environment where organic material was deposited affects the type and quantity of fossil fuels that are formed. For example, organic material deposited in marine environments may form oil, while organic material deposited in peat bogs or swamps may form coal.

Tectonic setting: Tectonic activity, such as plate movements, can affect the accumulation and preservation of organic material. For example, areas with active tectonic activity may have more uplift and erosion, which can result in the destruction of organic material before it can be buried and preserved.

Sedimentary basin characteristics: The size, depth, and shape of a sedimentary basin can also affect the amount of fossil fuels that are formed. For example, large, deep basins with thick layers of sedimentary rock may have a greater potential for oil and gas formation compared to smaller, shallower basins.

Source rock properties: The properties of the source rock, such as its organic content, mineral composition, and permeability, also influence the amount and type of fossil fuels that are formed. Rocks with higher organic content and better permeability are more likely to generate and retain larger amounts of fossil fuels.

Migration pathways: Once fossil fuels are formed, they must migrate through the surrounding rock to accumulate in economically viable amounts. The presence of faults, fractures, and other permeable structures can facilitate the migration and accumulation of fossil fuels in a particular area.

In summary, the amount of fossil fuels found in an area is affected by a combination of geological and tectonic factors that influence the formation, preservation, and accumulation of organic material over millions of years.

Explanation:

The frequency of this microwave is 9.375 x 10^9 Hz

The frequency of a certain microwave having a wavelength of 0.032m will be 9.375 x 10^9 Hz.

Let:

Using the relation between frequency and wavelength:

                                    v = f.λ

                                    c = f(0.032m)

                  3 x 10^8m/s = f(0.032m)

                                     f = 3 x 10^8/0.032

                                    f = 9.375 x 10^9 Hz

Electromagnetic Waves always travel at the speed of light. Electromagnetic Waves possess both electric and magnetic fields aligned perpendicularly to each other.

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Answer:

In substances such as iron, cobalt, and nickel, most of the electrons spin in the same direction. This makes the atoms in these substances strongly magnetic—but they are not yet magnets. To become magnetized, another strongly magnetic substance must enter the magnetic field of an existing magnet.

The equation for finding the net torque on a dipole is given by τ = p × E, where τ represents the torque, p is the dipole moment, and E is the electric field.

A dipole exhibits a torque because it consists of two opposite charges separated by a distance, and when placed in an electric field, these charges experience forces in opposite directions, causing a rotational effect or torque. The torque tends to align the dipole moment with the direction of the electric field, and the strength of the torque depends on the magnitude of the dipole moment and the electric field, as well as the angle between them.

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Impulse: Force x time

Force = 150 N

Time = 0.013s

I = 150 N x 0.013 s = 1.95 kgm/s

The activity of the sample after 5 hours is 2.5 * 10^9 dps or 2.5 * 10^9 Bq

The activity of a radioactive sample refers to the rate at which its nuclei decay, and it is typically measured in units of disintegrations per second (dps) or becquerels (Bq).

To determine the activity of the sample after 5 hours, we need to consider the concept of half-life. The half-life of a radioactive substance is the time it takes for half of the nuclei in a sample to decay.

Given that the half-life of the nuclei in the sample is 2.5 hours, we can calculate the number of half-lives that occur within the 5-hour period.

Number of half-lives = (Time elapsed) / (Half-life)

Number of half-lives = 5 hours / 2.5 hours = 2

This means that within the 5-hour period, two half-lives have occurred.

Since each half-life reduces the number of nuclei by half, after one half-life, the number of nuclei remaining is (1/2) * (10^10) = 5 * 10^9 nuclei.

After two half-lives, the number of nuclei remaining is (1/2) * (5 * 10^9) = 2.5 * 10^9 nuclei.

The activity of the sample is directly proportional to the number of remaining nuclei.

Therefore, After 5 hours, the sample has an activity of 2.5 * 109 dps or 2.5 * 109 Bq.

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The horizontal distance from the point directly below C to where the skier lands is 54.2 m.

Applying conservation of energy and conservation of momentum principles.

First, let's find the initial potential energy of the skier at point A:

PE1 = mgh1

= (80 kg)(9.81 m/s^2)(h1)

Next, let's find the final kinetic energy of the skier at point C:

KE2 = (1/2)mv2^2

= (1/2)(80 kg)(42 m/s)^2

Since there is no friction,

PE1 = KE2 + PE3

where PE3 is the potential energy of the skier at point C:

PE3 = mgh3 = (80 kg)(9.81 m/s^2)(10 m)

Substituting the values, we get:

(80 kg)(9.81 m/s^2)(h1) = (1/2)(80 kg)(42 m/s)^2 + (80 kg)(9.81 m/s^2)(10 m)

to determin h1,

h1 = (1/2)(42 m/s)^2/9.81 m/s^2 + 10 m

h1 = 144.8 m

Therefore, the height of the hill is 144.8 m.

Since there is no external force acting on the skier in the horizontal direction, the horizontal momentum is conserved:

mvi = mvx

vx = v2cos(25°)

Substituting the values, we get:

vi = (42 m/s)cos(25°)

vi = 37.9 m/s

Therefore, the initial horizontal velocity of the skier at point C is 37.9 m/s.

to determine time of flight:

h = (1/2)gt^2

t = √(2h/g)

t = √(2(10 m)/(9.81 m/s^2))

t = 1.43 s

applying the horizontal velocity and the time of flight to find the horizontal distance traveled:

d = vixt

d = (37.9 m/s)(1.43 s)

d = 54.2 m

The horizontal distance from the point directly below C to where the skier lands is 54.2 m.

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Answer:

To solve this problem, we can use the conservation of energy and the conservation of momentum. We can assume that there is no friction or air resistance, so the total mechanical energy of the skier is conserved throughout the motion.

Let's denote the initial height of the hill as h1, the height of point C above the ground as h2, the horizontal distance from point A to the point directly below C as x, and the angle of the skier's velocity vector with respect to the horizontal as θ.

First, we can calculate the speed of the skier at the bottom of the hill, point B, using conservation of energy:

mgh1 = (1/2)mvB^2 where m is the mass of the skier and vB is the speed of the skier at point B.

Solving for vB, we get:

vB = sqrt(2gh1)

Next, we can calculate the velocity of the skier at point C using conservation of energy:

mgh1 = (1/2)mvB^2 + (1/2)mvC^2

where vC is the speed of the skier at point C.

Solving for vC, we get:

vC = sqrt(2gh1 + vB^2)

We can also express the velocity vector at point C in terms of its x and y components:

vCx = vCcos(θ)

vCy = vCsin(θ)

Using conservation of momentum, we can find the horizontal distance x from the point directly below C to where the skier lands:

mvCx(h2/(-vCy)) = mvCx(t) + (1/2)gt^2

where t is the time taken for the skier to reach the ground and we have used the fact that the vertical displacement from point C to the ground is h2. We can solve for t by substituting vCy = vC*sin(θ) and solving the quadratic equation:

(1/2)gt^2 + vC*sin(θ)*t - h2 = 0

Solving for t, we get:

t = (-vCsin(θ) + sqrt(vC^2sin(θ)^2 + 2gh2))/g

Finally, we can substitute this expression for t into the equation for x to get:

x = vCx*t

Substituting the expressions for vCx, t, and vC, we get:

x = (vC^2sin(θ)cos(θ) - sqrt(vC^4sin(θ)^2cos(θ)^2 + 2gh2vC^2sin(θ)^2))/(g*sin(θ))

Plugging in the given values, we get:

x ≈ 184.5 meters

Therefore, the horizontal distance from the point directly below C to where the skier lands is approximately 184.5 meters.

Answer:

F = 50 N

Explanation:

First we find Acceleration.

Initial Velocity(u) = 20 m/s

Final Velocity(v) = 0 m/s

Time(t) = 0.2 s

Acceleration(a) = (v - u) / t

a = (20 - 0) / 0.2

=> a = 20/0.2

=> a = 100 m/s^2

Now we know F = ma,

Mass(m) = 0.5 kg

=> F = (0.5)(100)

=> F = 50 N

Answer:

A

Explanation:

because the first law of thermodynamics is heat brings energy, but don't get confused with C, because bicyle pumps is the thing itself getting warm, though its not providing any energy unlike the stove, which uses it energy to heat something.

hope this helps :)

Answer:

200N

Explanation:

mass = 20 kg

acceleration = 10 m/s^2

Force = mass * acceleration

         = 20 *10

         = 200 N

Answer:

3 moles

Explanation:

Ratio of O2 to CO2 = 2 : 1 = 6 : 3

Answer:

need more context

Explanation:

Answer:

EL QUE TENGA MÁS MASA Y MÁS ALTURA.

Explanation:

In electrical engineering, nodal analysis is an approach for circuit analysis that entails applying KCL (Kirchhoff's Current Law) to each node in the circuit. This involves selecting a reference node and then identifying the voltage at each of the other nodes with respect to this reference.

Node voltage analysis is another name for nodal analysis. The nodal analysis for the circuit diagram shown below is as follows:

For Node A, starting with the KCL equation,

I1 + I3 = I2For Node B,I2 = I4 + I5

Taking the reference node as Node C, so,

V1 = 10V + V3

For Node C,

I3 + I4 = I5 + I6

Using the values from the above equations, the nodal analysis equation can be written as:

For Node A,

I1 + I3 - I2 = 0

For Node B,

-I4 - I5 + I2 = 0

For Node C,

I3 + I4 - I5 - I6 = 0

Node voltages can be determined by solving these equations. In order to solve the nodal analysis equations, use matrices which are a mathematical representation of a system of equations. In order to determine the node voltage, the KCL equation for each node must be formed.

The current entering the node is equal to the sum of the currents leaving the node. Solving the matrix equation, the voltage at Node A is calculated as follows:

V_1=V_3-

\frac{V_2}{2}=

\frac{10+5V_2+20}{3}-

\frac{V_2}{2}=

\frac{80-7V_2}{6}

Therefore, the voltage \(V_1\) in the given circuit is \(\frac{80-7V_2}{6}\).

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In a parallel resistor circuit, the current through one resistor is not always the same as the current in the other resistors in the circuit. The correct answer is: d.

In a parallel resistor circuit, the current is split between the different branches of the circuit. The total current in the circuit is equal to the sum of the currents in each branch. Each resistor in a parallel circuit has a different resistance, which determines how much current flows through it. The resistor with the lowest resistance will have the highest current flowing through it, while the resistor with the highest resistance will have the lowest current flowing through it. Therefore, option d is correct.

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Answer:

a)    7.34 meters

b)    2.446 seconds

Explanation:

Part a)

First take note.

Initial velocity = 12

Initial horizontal velocity = 0

Initial vertical velocity = 12

If something is launched straight up in the air, it is launched at angle of 90 degrees.

\(h_{max} =\frac{v_{0y} ^{2} }{2g}\)

This equation defines the maximum height of a projectile above its launch position.

\(h_{max}\) = maximum height

\(v_{0y} ^{2}\) = initial velocity in the y direction

\(g\) = gravity

We are given

\(v_{0y} ^{2}=12\)

\(g=9.81\)

Lets solve for \(h_{max}\).

\(h_{max} =\frac{12 ^{2} }{2*9.81}\)

\(h_{max} =\frac{144 }{2*9.81}\)

\(h_{max} =\frac{144 }{19.62}\)

\(h_{max} = 7.34\) meters

Part b)

\(T_{tot} =\frac{2(v_{0}*sinx) }{g}\)

Note x = angle

This is the time of flight for a projectile both launched and impacting on a flat horizontal surface.

We are given.

\(v_{0}=12\)

\(x=90\)

\(g=9.81\)

Lets solve for \(T_{tot}\).

\(T_{tot} =\frac{2(12*sin90) }{9.81}\)

\(T_{tot} =\frac{2(12*1) }{9.81}\)

\(T_{tot} =\frac{2(12) }{9.81}\)

\(T_{tot} =\frac{24 }{9.81}\)

\(T_{tot} =2.446\) seconds

Answer:

26.5m/s²

Explanation:

Given parameters:

Tangential velocity of the object  = 23m/s

Radius of track = 20m

Unknown:

Acceleration = ?

Solution:

The acceleration of the body is its centripetal acceleration. It is given by;

  a  = \(\frac{v^{2} }{r}\)  

v is the tangential velocity

r is the

          a  = \(\frac{23^{2} }{20}\)   = 26.5m/s²

Answer:

chemical energy, Energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; such reactions are called exothermic

Explanation:

hope it will help you

Answer:

Psychology is the scientific study of mental processes and behavior.

Explanation:

God Bless :)

Answer:

The elevator moves up with an acceleration of  3.5 m/s²

Explanation:

Given:

m = 15 kg   (not 150!! :))

Tmax = 200 N

g = 9.8 m/s²

____________

a - ?

The elevator moves up with an acceleration a:

Tmax =  m·(g + a)

g + a = Tmax / m

a = Tmax / m  -  g

a = 200 / 15 - 9.8 ≈   3.5 m/s²