what is the angle of refraction for an ultrasound beam incident at an angle of 15 degrees from muscle into bone?

Answer:

pull up???????????????

Answer:

200

Explanation:

P = M x V

P = 8 x 25

P = 200

which class question is this

Answer:

2.00

Explanation:

Move the sinθ to the right.

The period of vibration A) is 0.182 seconds. B) If the cart's mass the frequency will be 3.88 Hz. C) If the spring constant doubles while the cart's mass remains the same, the frequency will be 7.78 Hz.

What is vibration?

Vibration refers to the rapid back-and-forth or oscillatory motion of an object or a system around a reference point or equilibrium position. It involves the periodic movement of an object or system between two extreme positions or states.

A) The period of vibration is the reciprocal of the frequency, so the period T is given by T = 1/f.

Substituting the given frequency f = 5.5 Hz, we find T = 1/5.5 = 0.182 seconds.

B) The frequency of vibration is inversely proportional to the square root of the mass of the cart. If the mass is doubled, the frequency will decrease. Using the relationship f' = f√(m/m'), where f' is the new frequency, m is the original mass, and m' is the doubled mass,

we find f' = 5.5 Hz √(1/2) = 3.88 Hz.

C) The frequency of vibration is directly proportional to the square root of the spring constant. If the spring constant doubles, the frequency will increase.

Using the relationship f' = f√(k'/k), where f' is the new frequency, k is the original spring constant, and k' is the doubled spring constant, we find f' = 5.5 Hz √(2/1) = 7.78 Hz.

To know more about frequency, refer here:

https://brainly.com/question/32136311#

#SPJ4

Answer and work is shown in the image attached.

please mark me brainliest :)

The solution in the first answer is excellent.

Here's another way to do it:

Force = (mass) x (acceleration)

Force = (4 kg) x (2 m/s²)

Force = 8 Newtons

Distance = (1/2) (a) (T²)

D = (1/2) (2 m/s² ) (7 sec)²

D = 49 meters

Work = (force) x (distance)

Work = (8 N) x (49 m)

Work = 392 Joules   yay!

To determine the maximum mass of coal the barge can carry in freshwater without sinking, we need to consider its buoyancy and weight. Buoyancy is the force that allows the barge to float and is equal to the weight of the water displaced by the barge. The weight of the barge and its cargo must not exceed the buoyant force to prevent sinking.

Assuming the barge has a rectangular shape, we can calculate its volume using the formula V = l x w x h, where l is the length, w is the width, and h is the height of the barge. Let's assume the barge is 30 meters long, 10 meters wide, and 4 meters high. Therefore, the volume of the barge is V = 30 x 10 x 4 = 1200 cubic meters.

Since the barge is made of 4.6-cm-thick steel plates on each side and the bottom, we need to calculate the weight of the steel and subtract it from the buoyant force. The density of steel is approximately 7850 kg/m^3. The total surface area of the barge is (2 x 30 x 4 + 2 x 10 x 4 + 30 x 10) = 280 square meters. Therefore, the mass of the steel in the barge is:

mass of steel = density x volume x thickness
mass of steel = 7850 x 280 x 0.046
mass of steel = 97,724 kg

Next, we need to calculate the buoyant force acting on the barge. The density of freshwater is 1000 kg/m^3. Therefore, the weight of the water displaced by the barge is:

weight of water = density x volume
weight of water = 1000 x 1200
weight of water = 1,200,000 kg

Finally, we can calculate the maximum mass of coal the barge can carry in freshwater without sinking:

maximum mass of coal = weight of water - weight of barge and steel
maximum mass of coal = 1,200,000 - (97,724 + weight of coal)

Assuming the density of coal is approximately 1300 kg/m^3, we can calculate the volume of coal that the barge can carry:

volume of coal = (weight of coal) / (density of coal)

Substituting this in the previous equation and solving for the maximum mass of coal, we get:

maximum mass of coal = 1,200,000 - (97,724 + volume of coal x 1300)

Solving for the maximum volume of coal, we get:

volume of coal = (1,200,000 - 97,724) / 1300
volume of coal = 882.7 cubic meters

Therefore, the maximum mass of coal the barge can carry in freshwater without sinking is:

maximum mass of coal = volume of coal x density of coal
maximum mass of coal = 882.7 x 1300
maximum mass of coal = 1,146,510 kg

In conclusion, the barge can carry a maximum of 1,146,510 kg of coal in freshwater without sinking, assuming the barge has a rectangular shape with dimensions of 30 x 10 x 4 meters and is made of 4.6-cm-thick steel plates on each side and the bottom.

To know more about freshwater click here:

https://brainly.com/question/26660631

#SPJ11

Answer:

0.67 km

Explanation:

Given that,

The speed of a wave, v = 10 km/s = 10000 m/s

The frequency of a wave, f = 15 Hz

We need to find the wavelength of the wave. The speed of wave in terms of wavelength and frequency is given by :

\(v=f\lambda\\\\\lambda=\dfrac{v}{f}\\\\\lambda=\dfrac{10000}{15}\\\\=666.66\ m\)

or

= 0.67 km

So, the wavelength of the wave is 0.67 km.

Answer:

2.22m/s^2

Explanation:

The solutions to sin(startfraction x over 2 endfraction) cos(x) – 1 = 0 for 0° ≤ x < 360° are x = 0°, x = 90°, x = 180°, and x = 270°.

Friction is a force between two surfaces that opposes motion when they rub against each other. It is the force that allows us to walk without slipping, and it is also the force that makes it difficult to move a heavy object. Friction is a type of non-conservative force, which means that it takes energy to overcome it, and that energy is not stored or conserved.
To find these solutions, we can apply the double-angle identity for sine:
sin(startfraction x over 2 endfraction) cos(x) = sin(startfraction x over 2 endfraction)startfraction cos2(startfraction x over 2 endfraction) -sin2(startfraction x over 2 endfraction) endfraction
= sin2(startfraction x over 2 endfraction) -sin2(startfraction x over 2 endfraction) + cos2(startfraction x over 2 endfraction)
= cos2(startfraction x over 2 endfraction)
= 1
Thus, sin(startfraction x over 2 endfraction) cos(x) = 1, and we can solve for x by setting cos(x) = 1. This gives us the solutions x = 0°, x = 90°, x = 180°, and x = 270°.

To know more about friction click-
https://brainly.com/question/24386803
#SPJ1

The acceleration of the car is  1.78 m/s² and the compared percentage with acceleration due to gravity is 18.16%.

To find the acceleration,

Velocity = 10m/s

Radius = 56 m

The formula to find acceleration is,

a = v²/r

By substituting the values,

a = 10²/56

   = 100/56

   = 1.78 m/s²

As a result, the acceleration due to gravity as a percentage is 9.8 m/s².

Percentage required = (1.78 /9.8) x 100

                                   = 18.16%

18.16% is the required percentage.

To learn more about acceleration refer to :

https://brainly.com/question/460763

#SPJ1

Answer:A plant that is 4.1 cm tall is 10.3 cm froma converging lens. You observe that the image of this plant is virtual and 6.2 cm tall.

Answer: Large-scale surface ocean currents are driven by global wind systems that are fueled by energy from the sun. These currents transfer heat from the tropics to the polar regions, influencing local and global climate.

Explanation:

I hope this helped you some!

No. That would be silly.  The water in the tropics is the warmest, since the sun is most direct there.  

Any ocean current that takes water away from the tropics moves the water to cooler places, where the water cools off.  ESPECIALLY the poles, home of the coldest water on Earth.  ICE even !

T diameter of the new wire must be 0.1572 m in order to maintain the same resistance between the two ends.

To determine the diameter of the new wire required to maintain the same resistance, we can use the equation

R = ρL/A,

where R is the resistance, ρ is the resistivity of the material, L is the length, and A is the cross-sectional area of the wire.
Since we know that the resistance must remain the same, we can rearrange the equation to solve for A:

A = ρL/R.
Plugging in the given values for resistivity, length, and resistance, we can calculate the required cross-sectional area of the wire:

A = ρL/R = (0.0005 Ω⋅m)(5 m)/(5 Ω) = 0.0025 m^2.
Since the cross-sectional area of the wire is circular, we can use the equation for the area of a circle A = πr^2 to solve for the radius r, and thus the diameter d of the new wire:
r = sqrt(A/π) = sqrt(0.0025 m^2/π) = 0.0786 m
d = 2r = 2 x 0.0786 m = 0.1572 m
Therefore, the diameter of the new wire must be 0.1572 m in order to maintain the same resistance between the two ends.
When the resistance between the two ends must remain the same, the diameter chosen for the new wire is directly proportional to the length of the wire. According to Ohm's law, resistance is directly proportional to length and inversely proportional to the cross-sectional area of the wire. Therefore, if the length of the wire doubles, the resistance doubles, and if the area of the wire doubles, the resistance is halved.This means that when the resistance between the two ends must remain the same, the diameter of the new wire must be such that the cross-sectional area of the wire is proportional to the length of the wire. In other words, if the new wire is half the length of the original wire, its diameter should be twice that of the original wire, and so on.

For more such questions on resistance , Visit:

https://brainly.com/question/17563681

#SPJ11

Answer:

This Means Nothing to ME

Explanation:

I HAVE A tradition of doing a little analysis on one of my favorite movie franchises to celebrate Star Wars Day (May the Fourth Be With You). Given that Rogue One: A Star Wars Story recently appeared on DVD and various streaming services, I think its OK to look at that film without worrying about spoilers. In this case, I will calculate Darth Vader's power output as he uses the Force.

To calculate the power needed to lift this poor fellow, I can estimate how high Vader lifts him and at what speed. If I guess that the rebel is 1.75 meters tall (the average height of a man here on Earth, so I'll assume the same holds true on whatever planet the rebel calls home) then I can get an approximate scale for the scene. With that, I can use video analysis to plot the vertical position of the rebel as a function of time

Option D, the sentence that best describes the object is the material of the object can be magnetized.​

The direction of the magnetic fields of the atoms that make up an object is always aligned towards the north pole or south of the material.

Objects that are made of unmagnetised  materials such iron, cobalt and nickel are attracted to either pole of a magnet, but not repelled.

The diagram given shows unmagnetised material, and hence the material of the object can be magnetized.​

Learn more about magnets here: https://brainly.com/question/14997726

#SPJ1

The total energy of the body at evevry point is remained same due to the law of conservation of energy. Distance from A to B and final velocity of the ball just reach before C is 44.3 m/s.

d (distance) from A to B is = √2gh

In this case given are, g = 9.8 m/s² and h = 100m,

so here d = √(2⋅9.8⋅100) = 44.3m.

Final velocity ,v = √2gh

Here given are , v is the velocity, g is the acceleration due to gravity, and h is the height. In this case,

g = 9.8 m/s² ,h = 100m,

v = √(2⋅9.8⋅100)

= 44.3 m/s (final velocity)

Learn more about the energy here

https://brainly.com/question/32623120

#SPJ1

The alpha particles are capable of alternating the mass and atomic numbers in the atoms which is responsible for transmutation. This occurs in nuclear reacting.

Learn more about radiation:

https://brainly.com/question/12494464

The approximate frequency is 9.96 × ³³ s-1

Solution:

Hypothetical wave energy = 6.6 J

Hypothetical wave frequency =?

E = HV  

v = E / h          

Where,

E = energy in joules

h = plank's constant & = 6.626 × 10-34 J.s

v = frequency in s-1

On substituting the values in the above formula :

v = E / h

v = 6.6 J / 6.626 × 10-34 J.s

v = 0.996 × 1034 s-1

v = 9.96 × 1033 s-1

Hence hypothetical wave frequency is = 9.96 × 10³³ s-1.

Count the markers to determine the frequency of each class. The relative frequency of a data class is the percentage of data items in that class. A joule is a unit of energy in the International System of Units. This is the work done when a force of 1 Newton displaces a mass 1 meter in the direction of the applied force.

Learn more about A hypothetical wave here:-https://brainly.com/question/18934990

#SPJ4

Answer:

k=694.44

Explanation:

PE=1/2kx^2

5=1/2k*.12^2

5=1/2k(.0144)

divide both sides by .0144

(a) The time for the sphere A to hit the floor is 0.5 second.

(b) The time for the sphere B to hit the floor is 0.5 second

(c) The distance travelled by sphere A from the edge of the table is 1.75 m.

(d) The distance travelled by sphere B from the edge of the table is 0.75 m.

The time of motion of sphere A is calculated by applying the following formula.

t = √ ( 2h / g )

where;

t = √ ( 2 x 1.2 / 9.8 )

t = 0.5 second

The time of motion of sphere B is calculated as;

t = √ ( 2 x 1.2 / 9.8 )

t = 0.5 second

The distance travelled by sphere A from the edge of the table is calculated as;

d = vt

where;

d = 3.5 m/s  x 0.5 s

d = 1.75 m

The distance travelled by sphere B from the edge of the table is calculated as;

d = 1.5 m/s  x  0.5 s

d = 0.75 m

Learn more about horizontal distance here: https://brainly.com/question/24784992

#SPJ1

The missing neutrinos from the sun had merely tranformed into muon and tau neutrinos  escaped detection.Hardly interacting with other matter,neutrinos comes in three different types electron,muon,and tau.

Hence option (b) turning into different type of neutrino in a neutrino oscillation is correct

Disclaimer:The question given on the portal is incomplete .Here is the complete question .

Question :Astronomers and physicists now believe they know what is happening to the missing neutrinos from the Sun (the neutrinos that our theories say should be emerging from the Sun, but our experiments in that underground mine could not find). These neutrinos are:

a)not being produced by the Sun because our star's nuclear fusion period has ended

b)turning into a different type of neutrino in a neutrino oscillation

c)being converted to antimatter in the core of the Sun and being destroyed as they hit matter

d)changing course before they reach the Earth as they hit other neutrinos in space

Learn more from here: brainly.com/question/28098168

#SPJ4

If one half-life has lapsed, the radioactive parent to stable daughter isotope ratio is 50:50.

The correct option is B) 50:50

In one half-life, half of the original radioactive parent isotopes decay into stable daughter isotopes, leaving the remaining half as radioactive parent isotopes. So, after one half-life, the ratio of radioactive parent isotopes to stable daughter isotopes is equal, making it a 50:50 ratio. After two half-lives, the ratio would be 25:75, and so on.

Learn more about radioactive here:

https://brainly.com/question/14332906

#SPJ11

The acceleration of the object is 5 m/s². The result is obtained by using the Newton's second law.

The Newton's second law states that "The acceleration is directly proportional to the net force acting on an object and inversely proportional to the object's mass." It can be expressed as

a = ∑F/m

Where

An object with a mass of 12 kg is acted upon by a force of 60 N.

Find the acceleration of the object!

Using the Newton's second law formula, we get acceleration.

a = ∑F/m

a = 60/12

a = 5 m/s²

Hence, the acceleration of the object is 5 m/s².

Learn more about Newton's second law here:

brainly.com/question/30396994

#SPJ4

If the Earth were to warm up, several changes and impacts would occur across various systems and environments.

Here are some of the key effects:

1. Climate Change: Warmer temperatures would contribute to climate change. This could lead to shifts in weather patterns, including more frequent and intense heatwaves, changes in precipitation patterns, and alterations in the frequency and intensity of storms.

2. Melting of Ice: Rising temperatures would accelerate the melting of glaciers and ice caps, leading to a rise in sea levels. This could result in coastal flooding, erosion, and the displacement of coastal communities.

3. Biodiversity Impacts: Many species are sensitive to temperature changes. Warmer temperatures could disrupt ecosystems, leading to shifts in the distribution and behavior of plants and animals. It may also affect migration patterns and disrupt the delicate balance of ecological interactions.

4. Ocean Changes: Warmer temperatures would impact oceanic systems, including increased sea surface temperatures and ocean acidification. These changes could have widespread implications for marine life, including coral bleaching, loss of habitats, and changes in marine food webs.

5. Human Health: Warmer temperatures could affect human health by increasing the risk of heat-related illnesses, expanding the range of disease-carrying vectors like mosquitoes, and impacting food and water availability.

Learn more about Climate Change here:

https://brainly.com/question/29838524

#SPJ11

Answer:

C. A turtle relies indirectly on the Sun as an energy source.

Explanation:

Turtles are animals, meaning they are unable to perform photosynthesis, thus option A is inapplicable. Turtles consume food such as algae and seagrass. These aquatic plants gain their energy directly from the Sun through photosynthesis, and as a result when the turtle consumes these plants, that energy from the Sun is indirectly feeding the turtle.

Answer:

20 kg

Explanation:

F = ma

m - mass in kilograms

a = acceleration

F = force

Copernicus influenced Newton as the Copernican Revolution was brought to a close by Sir Isaac Newton's Philosophiae Naturalis Principia Mathematica.

Copernicus, the father of modern astronomy, was a Polish astronomer and mathematician. He was the first European scientist to propose the heliocentric theory of the solar system, which states that Earth and other planets revolve around the sun.

By developing the heliocentric theory of Earth's relationship to our Sun, Nicolaus Copernicus altered how educated people saw the world. The heliocentric theory, which is now widely accepted, states that Earth and the other planets revolve around the Sun.

His laws of planetary motion and universal gravitation were developed to explain the presumed motion of the heavens by asserting a gravitational force of attraction between two objects.

Learn more about Newton on:

https://brainly.com/question/25545050

#SPJ1

The radiation emitted from an area A of a black body at absolute temperature T is directly proportional to the fourth power of the temperature, according to Stefan Boltzmann's equation.

Mathematically, u/A = σ T⁴

where,

σ is Stefans's constant(5.67 × 10⁻⁸ W/m²k⁴)

According to the equation above, a body that is not a black body receives less radiation and consequently emits less of it.

For such a body, u = e σ A T⁴

where,

e is emissivity(value lies between 0 and 1)

With the surrounding temperature T₀, energy radiated by an area per unit time.

Δu = u - u₀ = e σ A (T⁴ - T₀⁴)

The blackbody's temperature and the quantity of power it emits per unit area are related by Stefan Boltzmann's law. The total energy emitted or radiated by a black body per unit surface area across all wavelengths and per unit time is directly proportional to the fourth power of the black body's thermodynamic temperature, according to the law.

To know more about Boltzmann Law:

https://brainly.com/question/30550607

#SPJ4