It takes 50 seconds for a wave with a wavelength of 0.2 m to travel past you. What is the frequency of the wave?A.10 HzB.250 HzC.0.02 HzD.0.5 Hz

The Coefficient of linear expansion of the brass =  1.56 * 10 ⁻⁶  

Thermal expansion is the tendency to be counted to trade its form, vicinity, volume, and density in reaction to an exchange in temperature, typically not including phase transitions. Temperature is a monotonic function of the average molecular kinetic electricity of a substance.

Length of metal sheet = 40 cm

broad = 8 cm

Initial Surface area = 40 × 8 = 320 cm²

Final surface area = 320.1  cm²

Change in area ΔA = 320.1  cm² - 320 cm² = 0.1 cm².

change in temperature ΔT = T final -T initial  

                                       ΔT = 100 - 0 = 100

α =  coefficient of linear expansion

β =  coefficient of Surfacial expansion

         ΔA = A initial β  ΔT

          β =   ΔA/A initial  ΔT

          β =  0.1 / 320 *100

          β = 3.125 * 10 ⁻⁶

Relation between α and β :

         α =  β/2

        α = 3.125 * 10 ⁻⁶/2

        α = 1.56 * 10 ⁻⁶   answer.

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Answer:

The answer is 50 watts

Explanation:

The formula of power is work done over elapsed time

P= W/t
P= 550 J / 11 sec

P= 50 watts

Answer:

173.2

Explanation:

The centripetal acceleration of the car moving in a radius of curvature of 200 m with a velocity of 26.8 m/s is 3.591 \(m/s^2\).

The centripetal acceleration is the rate at which a body moves through a circle. Considering that velocity is a vector quantity (that is, it has both a magnitude, speed, and direction). When a body moves in a circle, its direction is constantly changing, which causes a change in velocity and acceleration.

The circle's center is where the acceleration is pointed radially. The square of the body's speed along the curve divided by the distance r from the circle's center to the moving body determines the centripetal acceleration, which has a magnitude equal to ac.

Given information:

The velocity of the car, \(v=26.8 \ m/s\),

The radius of the curvature, \(r=200\ m\).

Calculate the acceleration by the formula given below,

\(\alpha =v^2/r\)

\(\alpha\) is the acceleration,

Substitute the values,

\(\alpha =(26.8)^2/200\)

\(\alpha = 3.591\ m/s^2\)

Therefore, the centripetal acceleration of the car moving in curvature is 3.591 \(m/s^2\)

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Answer: from the vertical, one should aim  86.6°

Explanation:

height of the center of object = 7.0 m - 0.05 m = 6.95 m

now let the bullet hits centre at point A height x meters from the ground

also let t be the time taken for the bullet to hit the object

so distance travelled by the target will be

d = h - x = 6.95 - x

now using the equation of motion

d = 1/2gt²

so 1/2gt² = 6.95 - x

x = 6.95 - 1/2gt² .........let this be equ 1

let angle of fire be ∅

so v(cos∅) × t = 100

our velocity v is 1200 ft/sec = 365.76 m/s

365.76(cos∅) × t = 100 ........equ 2

also vertical position of the bullet after t is

y = y₀ + c(sin∅)t - 1/2gt²

y = 1 + 365.76(sin∅)t - 1/2gt² ----- equ 3

After time t. the vertical position x and y are same, else the bullet wouldn't have strike target at centre, so;

x = y

we substitute

equ 1 = equ 3

6.95 - 1/2gt² = 1 + 365.76(sin∅)t - 1/2gt²

6.95 - 1 = 365.76(sin∅)t - 1/2gt² +  1/2gt²

5.95 = 365.76(sin∅)t

t = 5.96 / 365.76(sin∅)

now input the above equ  into equ 2

365.76(cos∅) ×  5.96/365.76(sin∅) = 100

5.95(cos∅)/sin∅ = 100

tan∅ = 5.95/100 = 0.0595

∅ =  3.40°

therefore from the vertical, one should aim (90° - 3.40°) = 86.6°

The near point of a human eye is about a distance of 25 cm.

The closest distance that an object may be viewed clearly without straining is known as the near point of the eye.

This distance (the shortest at which a distinct image may be seen) is 25 cm for a typical human eye.

The closest point within the accommodation range of the eye at which an object may be positioned while still forming a focused picture on the retina is also referred to as the near point.

In order to focus on an item at the average near point distance, a person with hyperopia must have a near point that is further away than the typical near point for someone of their age.

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The electric conductivity of the wire is 0.05 siemens per meter (S/m).

To calculate the speed of sound in the air, you can use the formula:

Speed of sound = Distance / Time

In this case, the distance is 10 meters and the time is 0.05 seconds:

Speed of sound = 10 m / 0.05 s = 200 m/s

Therefore, the speed of sound in the air is 200 meters per second (m/s).

To calculate the electric current flowing through a wire, you can use Ohm's Law:

Current = Voltage / Resistance

In this case, the voltage is 50 volts and the resistance is 10 ohms:

Current = 50 V / 10 Ω = 5 A

Therefore, the electric current flowing through the wire is 5 amperes (A).

To calculate the electric conductivity of the wire, you can use the formula:

Electric conductivity = 1 / Resistance * (Cross-sectional area / Length)

In this case, the resistance is 10 ohms, the length is 10 meters, and the cross-sectional area is 0.5 square meters:

Electric conductivity = 1 / 10 Ω * (0.5 m^2 / 10 m) = 0.05 S/m

Therefore, the electric conductivity of the wire is 0.05 siemens per meter (S/m).

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Answer:

In a material, the magnetic behavior depends on the alignment of magnetic moments of the atoms. Magnetic moments are generated by the motion of the electrons in the atoms. When the magnetic moments of atoms in a material are aligned in a specific pattern, it creates a magnetic field which results in the material being magnetic.

In many materials, the magnetic behavior arises due to the alignment of magnetic domains, which are regions of atoms with magnetic moments aligned in the same direction. When many domains with aligned magnetic moments are present in a material, the material becomes magnetic.

The magnetic behavior of a material depends on the number of electrons and the arrangement of those electrons in the atoms. In particular, for an atom to have a magnetic moment, it must have unpaired electrons, meaning electrons that are not paired with another electron with the opposite spin. When these unpaired electrons in the atoms are aligned, they generate a magnetic moment. If all electrons are paired, there will not be a net magnetic moment, so the material will not be magnetic.

So, in summary, the magnetic behavior of a material is determined by the alignment of magnetic moments of atoms. When the magnetic moments of many atoms in a material align in the same direction, it creates a magnetic field, leading to a material being magnetic. This alignment is usually present in magnetic domains consisting of atoms with unpaired electrons.

The heaviest liquid is mercury. In order to equalize the air pressure, it only climbs 76 cm. Water will rise to a 13.6 because it is 13.6 times lighter than mercury. By a factor of 13.6, mercury is 13.6 times denser than water.

Therefore, the barometer's height would be 13.6 times higher if water were employed in place of mercury. Since water expands when it freezes, the glass tube would be broken.

Because of its high density, mercury is frequently employed in barometers, allowing for a column height that is appropriate for measuring atmospheric pressure. For example, a mercury barometer would need to be 13.6 times taller than a water barometer to measure the same change in pressure.

This is the primary justification for using mercury in thermometers. Mercury will provide accurate readings in comparison to water since it lacks the condensation property that water possesses. Mercury can be used to measure both negative and positive temperatures, whereas water cannot be used to measure either.

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Answer:

(a) 441 W (b) 0.59 hP

Explanation:

Given that,

Mass of a woman, m = 60 kg

Height of a staircase, h = 15 m

Time, t = 20 s

(a) We need to find the power she expend. Work done per unit time is called power. It is given by :

\(P=\dfrac{W}{t}\\\\P=\dfrac{mgh}{t}\\\\P=\dfrac{60\times 9.8\times 15}{20}\\\\P=441\ W\)

( b) Since, 1 hP = 745.7 W

P = 0.59 hP

The amount of force applied to the 7kg object that caused it to accelerate at 8m/s² is 56 newtons.

A force is simply a push or a pull of an object resulting from the object's interaction with another object.

From newton's second law;

Force = mass × acceleration

Given the data in the question;

Plug the given values into the formula to determine the applied force.

Force = mass × acceleration

Force = 7kg × 8m/s²

Force = 56kgm/s²

Force = 56 N

Therefore, the applied force is 56 newtons.

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Answer:

beuhhhhhhhghhhhhhhhhhh

The output light frequency of material used before doubling will be 0.056 Hz.

The term frequency refers to the number of repetitions that there will be for a certain unit of time. Frequency is usually measured in hertz (Hz). The hertz is going to tell us the number of frequencies per second, which would then be a cycle per second.

The frequency can be calculated by counting the number of occurrences within a time interval and dividing by the time that elapsed in that period. So the calculation will be:

                                                  1 Hz=\(\frac{1}{s}\)

A term that is related to the frequency and that is reciprocal to it is the period, which refers to the duration of time of a cycle in an event that is going to be repeated.

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Answer:

Explanation:

95.0 km/hr = 26.39 m/s

65 km/hr = 18.06 m/s

Circumference of a tire is 0.9π m

77 revolutions is a distance of

77(0.9π) = 69.3π m

v² = u² + 2as

a = (v² - u²) / 2s

a = (18.06² - 26.39²) / (2(69.3π))

a = -0.85 m/s²

s = (v² - u²) / 2a

s = (0² - 26.39²) / 2(-0.85)

s = 409 m

The frequency of the wave is 0.625 waves per second, calculated by dividing the number of waves (10) by the time (16.0 seconds).

To determine the frequency of a wave, you need to divide the number of waves (in this case, 10) by the time it takes for those waves to pass a certain point (in this case, a dock) within 16.0 seconds.

Frequency is usually measured in Hertz (Hz), which represents the number of cycles or events per second. So, to find the frequency, we calculate 10 waves / 16.0 seconds = 0.625 waves per second or 0.625 Hz.

This means that every second, 0.625 waves pass by the dock, giving you the frequency of the wave.

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Answer: The planet Mars is terrestrial.

Terrestrial planets are made of rock, earth, or a solid substance. Your other options, Jupiter, Saturn, and Uranus, are all made up of a mixture of gases.

Hope this helps!

The answer is Mars.

Terrestrial planets are Earth-like planets made up of rocks or metals with a hard surface. Terrestrial planets also have a molten heavy-metal core, few moons, and topological features such as valleys, volcanoes, and craters.

Terrestrial planets are smaller, closer to the Sun, and formed from the rock around a molten metal core. They have secondary atmospheres, fewer moons, and a slower spin. Jovian planets are larger, further from the Sun, and formed from gases around a solid metal and hydrogen core.

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Answer:

B. 98.6F is the temperature of dead body in 84.6F atmosphere.

Answer:

See below

Explanation:

After a while, the body will assume the temperature of its surroundings

  and will be  84.6 degrees F

 IMMEDIATLY after death the body will still be at 98.6 F ...but beginning to cool......

Answer:

I AM SO SORRY

but here is the answer

Explanation:

20 j

Answer:

The height from which the diver jumped can be calculated using the laws of motion and the principle of conservation of energy.

Let's assume that the diver jumped from a platform with an initial velocity of zero. The potential energy (PE) of the diver at the top of the platform is given by:

PE = mgh

Where m is the mass of the diver, g is the acceleration due to gravity (9.8 m/s^2), and h is the height from which the diver jumped.

When the diver jumps, the potential energy is converted into kinetic energy (KE) as the diver moves downwards. The kinetic energy of the diver just before hitting the water is given by:

KE = (1/2)mv^2

Where v is the velocity of the diver just before hitting the water.

According to the principle of conservation of energy, the potential energy at the top of the platform is equal to the kinetic energy just before hitting the water. Therefore, we can equate the two equations above and solve for h:

mgh = (1/2)mv^2

h = (1/2)v^2/g

We need to find the value of v to calculate h. We can use the kinematic equation:

v^2 = u^2 + 2as

Where u is the initial velocity (which is zero in this case), a is the acceleration due to gravity (9.8 m/s^2), and s is the distance travelled by the diver (which is equal to h).

Substituting the values, we get:

v^2 = 2gh

v^2 = 2 * 9.8 * h

v^2 = 19.6h

Therefore:

h = v^2/(19.6)

Now, let's assume that the velocity of the diver just before hitting the water was 10 m/s (a reasonable value for a diving competition). Then:

h = (10^2)/(2*9.8) = 51 meters

Therefore, the height from which the diver jumped is approximately 51 meters.

We can obtain the resultant displacement by geometry as 9.4 m North East

Displacement is the distance covered in a specific direction. It is a vector quantity hence its resultant must be obtained geometrically.

Given that, we can obtain the resultant displacement by the use of the Pythagoras theorem;

R= √(5)^2 + (8)^2

R = 9.4 m North East

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ANSWER:

12.3 m/s

STEP-BY-STEP EXPLANATION:

The vertical speed can be calculated by means of the following equation:

The speed in both cases is the same, since the angle remains the same.

We can calculate the initial speed in y since we know the angle, the value s would be the height, therefore, we substitute and calculate the final speed in y:

The speed would be 12.3 m/s in both cases

Answer:

The speed varies depending on atmospheric conditions; the most important factor is the temperature. Humidity has little effect on the speed of sound, nor does air pressure by itself. Air pressure has no effect at all in an ideal gas approximation.

Answer:

2.83 m/s

Explanation:

m = 5 kg,

KE = 20 J

KE = mv^2/2

20 = 5*v^2/2

5*v^2 = 40

v^2 = 8

v = \(\sqrt{8}\) = 2.83 m/s

The x and y component of the ball's final velocity are respectively 7.35 m/s and  4.90 m/s.

The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.

Given that:

Mass of the ball: M = 6.35 kg.

Initial velocity of ball: U = 8.49 m/s.

Mass of the pin at rest: m = 1.59 kg.

Final velocity of pin: v = 20.1 m/s at a -77.0° angle.

Let the x and y component of the ball's final velocity are respectively V₁ m/s and  V₂ m/s.

Appling conservation of momentum along x axis:

MU + m.0 = MV₁ + mvcos(-77.0°)

⇒ V₁ = u - (m/M) v cos(-77.0°)

After putting the values we get:

V₁ = 7.35 m/s.

Appling conservation of momentum along y-axis:

M.0 + m.0 = MV₂ + mvsin(-77.0°)

⇒ V₂ = - (m/M) vsin(-77.0°)

After putting the values we get:

V₂ = 4.90 m/s.

Hence, the x and y component of the ball's final velocity are respectively 7.35 m/s and  4.90 m/s.

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The change in angular momentum of the pulley-block system is given as \(\omega = Rm_ogt_o\)

Data;

This is the force that makes object rotate about an axis. The formula is given as the product between the radius about the axis and the force acting upon it.

The torque about point o is given as

\(\tau = R * m_og\)

The change in angular momentum about point 'o' is the product between the torque and time.

\(\omega = \tau * t_o\\\omega = Rm_ogt_o\)

The change in angular momentum of the pulley-block system is given as

\(\omega = Rm_ogt_o\)

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Answer:

If a ball is thrown straight up, its instantaneous velocity at the top of its path is 0 m/s, but its acceleration is 10 m/s2. ... Its acceleration can't be zero - that would mean that its velocity would not change

Explanation:

When a ball is hurled straight up, it has an instantaneous top speed of 0 m/s but an acceleration of 10 m/s². Since its velocity wouldn't change if its acceleration were zero, it can't be.

The instantaneous speed, as its name suggests, has to do with how fast an item is moving at a particular moment in time. The brief distance that an object has gone divided by the equivalent amount of time can also be used to determine its instantaneous speed. With each instant that passes, the instantaneous speed can fluctuate.

An automobile's speedometer, for instance, displays the vehicle's current speed. The instantaneous speed of the car might be 50 kmph at one point, and with a light press of the pedal, it might increase to 54 kmph at the next.

When the ball is thrown straight up, with the increase in height the speed of the ball starts to reduce, at the top the speed will become zero.

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The final vertical velocity of the skydiver at 50.8 m of fall is 31.56 m/s.

The time of motion of the girl is calculated as follows;

h = vt + ¹/₂gt²

where;

Substitute the given parameters and solve for time of motion;

50.8 = 0 + ¹/₂(9.8)t²

2(50.8) = 9.8t²

101.6 = 9.8t²

t² = 101.6/9.8

t² = 10.367

t = √10.367

t = 3.22 seconds

vf = vi + gt

where;

vi is the initial vertical velocity = 0

vf = 0 + 9.8(3.22)

vf = 31.56 m/s

Thus, the final vertical velocity of the skydiver at 50.8 m of fall is 31.56 m/s.

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Pathogens grow best at temperatures between 5°C and 60°C.

The ideal temperature range for food-poisoning bacteria to develop is between 5°C and 60°C. The temperature danger zone is the name given to this temperature zone.

The bacteria can't thrive if potentially dangerous items are kept heated (above 60°C) or cold (below 5°C). Bacteria can double in number in as little as 20 minutes at temperatures between 40 °F and 140 °F, where they proliferate the fastest.

FATTOM, an acronym for food, acidity, time, temperature, oxygen, and moisture, stands for the elements necessary for bacterial growth.

Due to their availability of nutrition, energy, and other elements that the bacteria require for growth, foods offer the ideal conditions for bacterial growth.

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The vector that is perpendicular to the original vector is vector B = (√3 i  - 2√3 k )

The vector that is perpendicular to the original vector is calculated as follows;

Let the vector = B = (xi + 0j + zk)

The dot product of A and B must be equal to zero.

A . B = (2i + 3j + k) . (xi + 0j + zk)

A.B = 2x  + z = 0

2x = - z

The product of the vector must be √15 and it is calculated as;

√ (x² + z²) = √15

x² + z² = 15

Substitute the value of x for z;

x²  +  (-2x)² = 15

x² + 4x² = 15

5x² = 15

x² = 15/5

x² = 3

x = √3

z = - 2x

z = -2√3

The vector B = (√3 i  - 2√3 k )

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Kepler's first law - sometimes referred to as the law of ellipses - explains that planets are orbiting the sun in a path described as an ellipse. ... The resulting shape will be an ellipse. An ellipse is a special curve in which the sum of the distances from every point on the curve to two other points is a constan