The measurement of cosmic distances was helped tremendously by the discovery, in the early part of the 20th century, that in Cepheid variable stars, the average luminosity was related to:

C

Let's see how

We know the rule

[tex]\\ \rm\rightarrowtail V=\dfrac{Kq}{r}[/tex]

[tex]\\ \rm\rightarrowtail Kq=vr[/tex]

[tex]\\ \rm\rightarrowtail q\propto r[/tex]

As radius is same charge will be same in both

Hence they both have same charge

Answer:

Etiquette determines which behaviors are polite and impolite among players and team. It is a code of polite conduct according to social norms and efficiency. Etiquette as a societal rule is formed to enhance positive human relation when interacting and can reduce conflicts in the society. A person who is aware of the etiquette in a given situation will be more confident, comfortable and competent thus making even those around him or her at ease.

The cross sectional area of the stream 0.50 m below the faucet is 2.54 x 10⁻⁵ m².

The speed of the water at the lower level is determined using Bernoulli's equation as follows;

P₀ + ρgΔh + ¹/₂ρv₁² = P₀ + 0 +  ¹/₂ρv₂²

ρgΔh + ¹/₂ρv₁²  = ¹/₂ρv₂²

gΔh + ¹/₂v₁²  = ¹/₂v₂²

9.8(0.5) + ¹/₂(5)² = ¹/₂v₂²

2(17.4) = v₂²

34.8 = v₂²

v₂ = √34.8

v₂ = 5.9 m/s

A₁v₁ = A₂v₂

A₂ = A₁v₁ /v₂

A₂ = (3.0 x 10⁻⁵ x 5) / (5.9)

A₂ = 2.54 x 10⁻⁵ m²

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Explanation:

As the Earth orbits the Sun, the tilt causes one hemisphere and then the other to receive more direct sunlight and to have longer days. The total energy received each day at the top of the atmosphere depends on latitude

Answer:

She is right!

Have a good day/Night!

Explanation:

Rex

Answer:

79 N     ( the same)

Explanation:

The charge would be in equilibrium so there would be no charge in the body of the conductor.

Answer:

(b) there cannot be any charge in the body of the conductor

Answer:

B

Explanation:

Note the line that there is no charges anywhere else outside means the charge is placed in equilibrium position.

Hence there cannot be any charge in the body of conductor

Explanation:

Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei, and fusion is the process where two light nuclei combine together releasing vast amounts of energy.

Answer:

1/2 M V^2 = M g H

Initial kinetic energy equals final potential energy

H = V^2 / (2 g)        satisfies given conditions

Answer:

takes longer than 365 days to orbit the sun

has seasons because of a tilted axis

Note: We see 365 days for a year - from an external point of view, a year would take 366 days to orbit the sun - this is because it takes slightly less than 24  hours from sunrise to sunrise because of the rotation of the earth about the sun (a sidereal year is 366 days as compared to 365 days observed on earth)

Answer:

+ .00769 C

Explanation:

Whoever 'katie' is , removed my previous, innocuous answer for some reason....

The force is repulsive , so the charge is also POSITIVE

f = k q1 q2 / r^2  

   k = Coulombs constant = 8.98755 x 10^9  kg m^3 . (s^2 C^2)

   q 1 = 1.4 x 10^-9 C     f = 20 x 10^-3  N

    r = 2.2 m       q2 = ?

Sub in the values to get q 2 = + .00769 C

The height of the tower is 35.75 m.

Height is the vertical distance between two points.

To calculate the height of the tower, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitiute these values into equation 1 and solve for L

Hence, the height of the tower is 35.75 m.

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The pairs of triangles that can be proven congruent by the hl theorem is the right angled triangle.

The HL theorem is also known as the Hypothenus Leg theorem, it states that "the hypotenuse and leg of one right triangle are congruent to the hypotenuse and leg of another right triangle, then the two triangles are congruent."

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Answer:

B

Explanation:

Answer:

12 units

Explanation:

Original F = C q1q2/r^2    now change the parameters

  New F = C  1/3 q1  2 q2  / (2r)^2

              =  2/12  C q1q2/r^2    <=======the new force is 1/6 of original

1/6 * 72 = 12 units  

Answer:

What work is done when a person pushes an 80 kg washing machine 12m across the floor. The force of friction between the washing machine and floor is 500 N.

A sailor pulls a boat along a dock using a rope at an angle of 60° with the horizontal. How much work does the sailor do if he exerts a force of 255 N on the rope and pulls the boat 4.0m?

Explanation:

Answer:

I think u missspelled something be cause the the sum would be a good 0.2927

Answer:

D

Explanation:

Use the products file to generate a list of product IDs that use AA batteries, then use the list of product IDs to search the purchases file to generate a list of customer IDs, then use the list of customer IDs to search the customers file to generate a list of e-mail addresses

Answer:

36 m

Explanation:

We can consider this to be an AP.

Then,

Subtract a₇ from a₉.

Finding a₁₅

Find rate of change

So

Distance travel in 6 s

Distance in 15s:-

The moon phase shows that D. light reflected during the first quarter and third quarter moon phases appears equal because the sun, moon and Earth are at right angles.

It should be noted that the moon phase simply means the portion of the moon that we can see from the Earth.

In this case, the light reflected during the first quarter and third quarter moon phases appears equal because the sun, moon and Earth are at right angles.

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Answer:

Sound is produced when an object vibrates, creating a pressure wave. This pressure wave causes particles in the surrounding medium (air, water, or solid) to have vibrational motion. As the particles vibrate, they move nearby particles, transmitting the sound further through the medium.

Explanation:

Answer:

Gravity on planet is 2 times earth gravity

Explanation:

Grav force =  G m1 m2 / (r^2)     now change  m1 and r

                  = G .051m1  m2 / ( .16 r)^2

                    = .051 /.0256   G m1 m2 / r^2

.051 /.0256 = ~ 2

Answer:

Approximately [tex]1.79 \times 10^{5}\; {\rm N \cdot m^{-1}}[/tex], assuming friction between the vehicle and the ground is negligible.

Explanation:

Let [tex]m[/tex] denote the mass of the vehicle. Let [tex]v[/tex] denote the initial velocity of the vehicle. Let [tex]k[/tex] denote the spring constant (needs to be found.) Let [tex]x[/tex] denote the maximum displacement of the spring.

Convert velocity of the vehicle to standard units (meters per second):

[tex]\begin{aligned}v &= 20.8\; {\rm km \cdot h^{-1}} \times \frac{1000\; {\rm m}}{1\; {\rm km}} \times \frac{1\; {\rm h}}{3600\; {\rm s}} \\ &\approx 1.908\; {\rm m \cdot s^{-1}}\end{aligned}[/tex].

Initial kinetic energy ([tex]{\rm KE}[/tex]) of the vehicle:

[tex]\begin{aligned}\frac{1}{2}\, m \, v^{2}\end{aligned}[/tex].

When the vehicle is brought to a rest, the elastic potential energy ([tex]\text{EPE}[/tex]) stored in the spring would be:

[tex]\displaystyle \frac{1}{2}\, k\, x^{2}[/tex].

By the conservation of energy, if the friction between the vehicle and the ground is negligible, the initial [tex]\text{KE}[/tex] of the vehicle should be equal to the [tex]{\rm EPE}[/tex] of the vehicle. In other words:

[tex]\begin{aligned}\frac{1}{2}\, m \, v^{2} &= \frac{1}{2}\, k\, x^{2}\end{aligned}[/tex].

Rearrange this equation to find an expression for [tex]k[/tex], the spring constant:

[tex]\begin{aligned}k &= \frac{m\, v }{x^{2}}\end{aligned}[/tex].

Substitute in the given values [tex]m = 1508\; {\rm kg}[/tex], [tex]v \approx 1.908\; {\rm m\cdot s^{-1}}[/tex], and [tex]x = 6.87\; {\rm m}[/tex]:

[tex]\begin{aligned}k &= \frac{m\, v }{x^{2}} \\ &\approx \frac{1508\; {\rm kg} \times 1.908\; {\rm m\cdot s^{-1}}}{(6.87\; {\rm m})^{2}} \\ &\approx 1.79 \times 10^{5}\; {\rm kg \cdot m \cdot s^{-2} \cdot m^{-3}}\\ &\approx 1.79 \times 10^{5}\; {\rm N \cdot m^{-1}}\end{aligned}[/tex]

Answer:

Different temperatures

Explanation:

Answer:

m v^2 / R = G M m / R^2       gravitational attraction = centripetal force

M = v^2 R / G       solving for M

period = 6 h 25 min = (6 * 3600 + 25 * 60) sec = 23,100 sec = T

v = 2 pi R / T

M = 4 pi^2 R^3 / (G T^2)

M = 39.5 * (8.6E7)^3 / (6.67E-11 * 2.31E4^2)

M = 39.5 * 636 / (6.67 * 5.34) * 10^24

M = 7.05 * 10^26 kg

Answer:

increases   increases   decreases

Explanation:

For an object falling from a height

For an ideal gas, initially at a volume of 0.777778 L,  the work done by the gas during this process is mathematically given as

w=15.380613

Generally, the equation for the work done  is mathematically given as

W=p1v1invfvi

Therefore

v2=p1v1/p2

v2=9*1.0.77778/1

v2=7.00002

In conclusion

w=7.00002ln7/0.777778

w=15.380613

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If 343 W/m² of energy is emitted by the sun to the earth, the quantity that reaches the earth is : ( D ) which is about half.

Radiation is the energy exchange that does not require a material medium for propagation.This is the process in which the sun exchanges heat with the earth.

Analysis:

When heat is exchanged between two bodies, heat is either, absorbed, transmitted or reflected. In the the cloud, energy is reflected back to the sun since the clouds are translucent, it allows a part to reach the clouds.

In conclusion, About half of this energy gets to the earth.

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Answer:

The correct answer is A. About one fourth.planation:

Answer:(a) With our choice for the zero level for potential energy of the car-Earth system when the car is at point B ,

          U

B

​

=0

When the car is at point A, the potential energy of the car-Earth system is given by

          U

A

​

=mgy

where y is the vertical height above zero level. With 135ft=41.1m, this height is found as:

y=(41.1m)sin40.0

0

=26.4m

Thus,

U

A

​

=(1000kg)(9.80m/s

2

)(26.4m)=2.59∗10

5

J

The change in potential energy of the car-Earth system as the car moves from A to B is

U

B

​

−U

A

​

=0−2.59∗10

5

J=−2.59∗10

5

J

(b) With our choice of the zero configuration for the potential energy of the car-Earth system when the car is at point A, we have U

A

​

=0. The potential energy of the system when the car is at point B is given by U

B

​

=mgy, where y is the vertical distance of point B below point A. In part (a), we found the magnitude of this distance to be 26.5m. Because this distance is now below the zero reference level, it is a negative number.

Thus,

The superposition of waves due to their interaction can either produce a constructive or destructive interference.

Wave superposition refers to the the interaction of two or more waves when their parts overlap.

Example of wave superposition is multiple waves travelling through a rope.

The superposition principle states that when two or more waves overlap in space, the resultant disturbance is equal to the algebraic sum of the individual disturbances.

Based on phase difference between two or more waves, the superposition if the waves can result in either constructive or destructive interference .

Therefore, the superposition of waves due to their interaction can either produce a constructive or destructive interference.

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