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Jonny

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    physics help plzi will give full 5 stars. thank you its urgent fast?

    plz help i don't get this question plz.. help me out!!!

    Homework Helphace 2 meses
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    physics help Fast i will givd full 5 stars.. i need help plz its urgent thank u?

    Help me plzzźzz!. i need help with this question i don't get it. plz help ke fast!

    Homework Helphace 2 meses
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    physics help urgent plz help!! fast!!?

    hi, i need help with this urgent plz help!!

    Homework Helphace 2 meses
  • physics help!!/ plz help fast!!?

    A small island 200 m wide is in the middle of an ocean. On one day, wave crests 50 m apart approach the island. On another day, wave crests 400 m apart approach the same island. In which case will there be a greater diffraction of the waves around the island?

    2 respuestasPhysicshace 2 meses
  • physics help!!/ plz help fast!!?

    Bats can hear sounds of frequencies as high as 100 000 Hz while a human can hear a sound of frequency 10 000 Hz.

    Which frequency of sound would best diffract around a barrier through an opening such as a small hole in a wall?

    If a small insect was flying behind a tree, which sound would more likely bend around the tree and reach the insect?

    1 respuestaPhysicshace 2 meses
  • hi, I need a feedback plzz.. fast!!!!.. Physics?

    The maximum pressure of a steel tank is 125 atm. The tank is filled with a cold gas at room temperature, 21°C, and heated to 375°C. What is the maximum cold pressure of the gas such that the maximum pressure is not exceeded? 

    Convert Celsius to kelvin:

    21°C + 273 = 294°K

    375°C + 273 = 648°K

      P1/ T1 = P2/ T2

    P1/ 294K = 125 atm/ 648K

    P1= 57 atm

    2 respuestasChemistryhace 3 meses
  • Physics help fast?

    A pulse of the shape below originates in spring A. The speed of the pulse in this spring is 4.0 m/s. Another spring, B, is connected to spring A. The speed of the pulse in spring B is 2.0 m/s. The “short” end of the original pulse is the right side with the steep decline.

    draw a diagram showing the reflected pulse. In your diagram, pay particular attention to the wavelength of the reflected pulse, the amplitude of the pulse, whether or not it is inverted, and in what direction the “short” end of the pulse is facing.

    Draw a diagram showing the partially transmitted pulse. In your diagram, pay particular attention to the wavelength of the transmitted pulse, the amplitude of the pulse, and in what direction the “short” end of the pulse is facing.

    Of the quantities, speed, wavelength, frequency, and amplitude, which of these does not change as a wave is partially reflected or partially transmitted?

    Of the quantities, speed, wavelength, frequency, and amplitude, which of these is always decreased in size as a wave is partially reflected or partially transmitted?

    2 respuestasPhysicshace 3 meses
  • Physics Help!!.. it's urgent. fast!!. pls?

    The speed of a transverse wave on a string is 450 m/s, while the wavelength is 0.18 m. The amplitude of the wave is 2.0 mm.

    What is the total up and down distance moved by the wave-particle for each cycle of the wave?

    What is the frequency of the wave?

    What is the period of motion of the wave?

    How many cycles of the wave would have to pass by a given point so that a particle on the string moves a total distance of 1.0 km?

    How much time is required for a particle on a string to move through a total distance of 1.0 km?

    2 respuestasPhysicshace 3 meses
  • chemistry help. urgent?

    1) If 358 g of KNO3 are dissolved in 650 mL of water at 80°C, at what temperature will solid settle out when it is cooled?

    4) a. If a solution containing 40.0 g of KNO3 in 100 g of water at 100°C is cooled to 25°C, how much of the solid will settle out?

    b. If you poured out half of the solution in (a) at 100°C, how many grams of the solid will the remaining solution contain?

    c. If instead of pouring out as in (b), you boil away 50 mL of water and return the to 25°C, how many grams of solid will now remain in the solution? 

    Chemistryhace 3 meses
  • Biology help!!!//.. I need help it's urgent. it about dinosaurs. i will give full 5 stars,!!!?

    summarize (in several paragraphs) how the mass extinction of the dinosaurs affected the evolution of mammals.

    this should include the language of evolutionary theory and should mention "punctuated equilibrium" as part of the explanation. Sources used.!!??

    1 respuestaBiologyhace 3 meses
  • Biology Help!!. need help with biology. pls help!!. its urgent. i will give full 5 stars?

    suppose that an allele, d, of a sex-linked gene is recessive and lethal. A man marries a woman who is heterozygous for this gene. If the couple had many normal children, what would be the predicted sex ratio of these children?

    Base your response on the number of predicted living children

    - Genotypes of the parents 

    - Gene combination for the gametes of each parent

    - A completed punnett square

    - Genotype ratio of offspring (prediction)

    - Phenotype ratio of offspring (prediction)

    2 respuestasBiologyhace 3 meses
  • help chemistry plz help me fast. I don't get this plz help me/. !! fast I will give full five stars plz help me. help!!!!!!!!!!!!!!!!!!!!!!!?

    1. A balloon has1.2 L of a gas is at 1.1 atm. What will be the new volume of the balloon if the balloon is placed in a partial vacuum with a pressure of 0.35 atm? 

    2. What is the pressure of 725 mL of a gas at 100.2 kPa if it’s volume is changed to 125 mL? 

    3. Explain why weather balloons are not completely filled with gas before they sail into the upper atmosphere.

    4. The maximum lung capacity of an average adult is about 4-6 L. A scuba diver takes a breath of about 2.1 L of air at a depth of 30 m where the pressure is 405 kPa. If the diver holds his/her breath while rising to the surface, where the pressure is 102 kPa, what is the volume of air in the lungs. What is the likely result?

    1 respuestaChemistryhace 3 meses
  • chemistry help help!!! plz help me. fast!! plzz?

    1) What volume of a 5.00 mol/L stock solution is needed to make 2.00 L of a 0.125 mol/L solution? (1.5 marks)

    2) Find the new concentration when 225 mL of a 3.00 mol/L solution has 575 mL of water added to it. (2 marks)

    3)What volume of water must be added to 250.0 mL of a 0.650 mol/L calcium chloride solution to produce a 0.430 mol/L solution? 

    1 respuestaChemistryhace 3 meses
  • helppppp!!!! Chemistry, i need help fast there are 4 questions plzzz help.. i need help plzz.. help chemistry, i will give full 5 stars.help?

    1) If 358 g of KNO3 are dissolved in 650 mL of water at 80°C, at what temperature will solid settle out when it is cooled? 

    2) Give 2 ways, quantitatively, that a solution of 80 g of NaNO3 in 100 mL of water at 70°C can be made saturated. 

    3) If 100 g of KClO3 is dissolved in 500 g of water at 80°C, how much more salt must be added to make the solution saturated? 

    4) a. If a solution containing 40.0 g of KNO3 in 100 g of water at 100°C is cooled to 25°C, how much of the solid will settle out? 

    b. If you poured out half of the solution in (a) at 100°C, how many grams of the solid will the remaining solution contain?

    c. If instead of pouring out as in (b), you boil away 50 mL of water and return the to 25°C, how many grams of solid will now remain in the solution? 

    Chemistryhace 3 meses
  • chem help!! have to make a graph. need help plzz.. thank you!!!! fastttt!!. Make sure to label axes and title the graph. its A heating curve?

    Temperature measurements were taken every minute for 35 minutes. 

         Table 1. Heating of Substance Y.

    Time(min) Temp(°C) Time(min) Temp(°C)

    0.0            15.2          19.0          92.5

    1.0            19.8          20.0          98.7

    2.0            24.7          21.0          107.0

    3.0            29.2          22.0          109.1

    4.0            31.3          23.0          109.4

    5.0            32.2          24.0          109.3

    6.0            32.0          25.0          109.3

    7.0            32.1          26.0          109.3

    8.0            32.1          27.0          109.4

    9.0            32.1          28.0          109.3

    10.0          32.2         29.0           109.4

    11.0          35.4         30.0           110.5

    12.0          45.0         31.0           111.8

    13.0          54.6         32.0           119.6

    14.0          61.2         33.0           127.1

    15.0          66.8         34.0           133.4

    16.0          75.0         35.0           139.7

    17.0          83.7

    18.0          88.1

    1. What is the melting point of this substance? How do you know? 

    2. What is the boiling point of this substance? How do you know?

    3. What phase(s) is/are present at each of the following points in time?

    a) 2 min b) 6 min c) 17 min d) 26 min e) 34 min 

    4. Explain why at the intervals of 5-10 min and 23-29 min the substance is being heated but the temperature is not increasing. 

    5. Explain how the length of the plateaus in the graph could be changed. (Give at least two ways) 

    1 respuestaChemistryhace 3 meses
  • hello!!!!???.. Mathhelp!!! i need help plzz help me with 3 math questions, i don't have time pls fast....pls, i will give ful 5 stars.?

    4. Find if dy/dx if: 2𝑥 ^3 − 3𝑥𝑦 + 𝑦^2 = 6

               Your final answer should be a rational expression in terms of x and y.

                          

     

    5. Find the equation of the tangent to the curve 𝑥^2𝑦^3 − 𝑥^3𝑦^2 = 12 at the point (-1,2). Show all work. State your equation in general form: 𝐴𝑥 + 𝐵𝑦 + 𝐶 = 0. 

     

    6. A circle has equation 𝑥^2 + 𝑦^2 + 2𝑥 − 6𝑦 = 15 , with the centre C at point (-1,3).

    Prove that the tangent at point P(2, -1) is perpendicular to the radius: line CP.

    3 respuestasMathematicshace 4 meses
  • help!!!! this math question plz help thank you very much, I need help fast plazzzzzzzzzzz.?

    2. Differentiate: 𝑦 = (16/3x)^6 Leave your final answer as a product of unexpanded rational expressions. There should be no negative exponents or radicals in your final answer.    

    3 respuestasMathematicshace 4 meses
  • Can you help me with this math question plzzzz I am stuck really bad and I need help thank you very much? I would very much appreciate it.?

    1. Find the derivative of the function: 𝑓(𝑥)= 4/√1−3𝑥 Leave your answer as a rational expression with, unexpanded polynomials to rational exponents. There should be no negative exponents or radicals in your final answer.           

    3 respuestasMathematicshace 4 meses