Search results

  1. S

    What type of wave is described by this equation

    Homework Statement x = (0.15 mm) cos (210x-120t) what type of wave is described by this equation? Longitudinal, transverse, angular frequency or both transverse and longitudinal Homework Equations NA The Attempt at a Solution Theres really no calculation. I thinking its longitudinal because...
  2. S

    Bernoulli's pressure

    Homework Statement Calculate pressure outside the box- ATM pressure is 101325 Pa, air moving outside the box is 45 m/s, air density is 1.3 kg/m^3 Homework Equations P + 1/2(roe)(v)^2 = Patm The Attempt at a Solution P + 1/2 (1.3kg/m^3)(45m/s)^2 = 101325 Pa P + 1316.25 Pa = 101325 Pa P=...
  3. S

    Frequency of oscillation

    Homework Statement 0.54 kg mass hang vertically from a spring with k= 75 Nm. If the mass is displaced 3 cm vertically and allowed to oscillate, what is the frequency of oscillation? Homework Equations T= 2(pi) ((sqrt)(m/K)) F= 1/T The Attempt at a Solution T= 2(pi) ((sqrt)(0.54/75)) =...
  4. S

    Average force on a rocket

    Homework Statement Rocket engine expends 1150 kg of gas in 1 second, with a velocity of -4.50×10^4 m/s. Calculate the average force exerted on the rocket by the gas during that 1.0 second interval Homework Equations F= m(delat)v / (delta)t The Attempt at a Solution F= (1150kg)(-45000m/s) / 1...
  5. S

    Spring constant, find height of projectile

    Homework Statement A 48 gram dart is shot vertically upwards from a catapult with a spring constant of 350 N/m. The catapult is initially stretched from the equilibrium point by 21 cm. What is the height above the starting point reached by the dart? Homework Equations KE=PE, rearranging to...
  6. S

    Net work calculation problem

    Homework Statement a box is pushed horizontally across a floor with a force of 70 N to the right. There is a friction force also acting on the box in the opposite direction of 18 N. if the box is displaced 8 meters. what is the net work done on the box? Homework Equations W(net)= Fd cos...
  7. S

    How far will the box slide?

    Homework Statement How far will a box slide if its initial velocity is 1.5 m/s, kinetic friction is 0.15 and the object is 30 kg Homework Equations a= (kinetic friction)(acceleration due to gravity) and V(final)^2 - V(initial)^2 = 2(a)(D) The Attempt at a Solution a= 0.15 x 9.81 m/s^2 =...
  8. S

    Calculate the net force on the object

    Homework Statement Two forces are acting on an object and make a 130 degree angle between the two. One force is horizontal to the x axis and is 13N. The other is 9 N. Calculate the net force on the object Homework Equations Not really equations, but I broke the one force into its x and y...
  9. S

    Constant acceleration

    Homework Statement A speeding car has instantenous velocity of 1 m/s when a stopwatch reads 10 seconds. It has constant acceleration of 2 m/s^2. What is the cars speed when it reaches the stopwatch reads 12 seconds. Homework Equations x= (Vinitial)(DeltaT) + 1/2(a09deltaT)^2 I think this is...
  10. S

    Calculating error on density

    Homework Statement The density of a cylinder is calculated from the following data: mass m= (9.1±1.1)g , diameter d = (2.8±0.2) cm , and height H= (4.1±0.6) cm. The error on the density, before rounding, is ( in g /cm3 ) Homework Equations The Attempt at a Solution
  11. S

    Equations for average and maximum velocity

    Homework Statement Given height dropped and gravity constant, what is the maximum and average velocity of an object dropped from a building. Gravity- 9.81 (Delta)y- 45 m. Height from which object is dropped T- 3.1 seconds Homework Equations V= v(final)-v(initial)= a x (delta)t V(avg)= (sqrt...
  12. S

    Abundance of isotopes based on ratios

    Homework Statement how do i find abundances of isotopes of strontium if i am give their isotopic ratios and atomic masses Homework Equations The Attempt at a Solution i know i have to find what the mass of each isotope is in the ratios to find the % abundance. i dont want to put up...
  13. S

    How to calculate density from specific weight in imperial units

    Homework Statement alright so i have to find the density of a clay unit. im given a specific weight of the clay as 120 b/ft^3, the gravity constant as 32.17 ft/s^2. i need to find the density of the clay, i have no problem arranging the equation below to solve for density but im not used to...
  14. S

    Weight percent concentration calculation with partition coefficients

    Homework Statement what is the weight percent concentration of SO2 in the exsolved aqueous fluid phase that existed with solution if sulphur has ppm by weight of 90. partition coefficient= 47 Homework Equations partition coefficient- 47= concentration of aqueous fluid/ concentration of...
  15. S

    Darcy equation, hydraulic conductivity calculation

    Homework Statement ive done the darcy experiment in the lab already and have the data, the question asks to calculate the hydraulic conductivity,K. ive done one already and im just looking for confirmation that ive done it correctly because ive never used this equation before. I know im...
  16. S

    Pitch of net slip and plunge and trend of net slip of a fault using stereonets

    ive been given a problem in my school work. it involves 2 veins that have been cut by a fault and displaced along the fault plane. the question gives the orientation of the cut veins on either side of the wall and the orientation of the fault. it asks for the following: net slip, plunge and...
  17. S

    How do alkaline rocks get so enriched in alkalis?

    How do alkaline rocks get so enriched in alkalis and incompatible trace elements ?
  18. S

    Middle and end members of fractionation series of high alkaline rocks

    Name the middle and end-members of fractionation series that start with: a) basanite-tephrite b) trachybasalt, c) hawaiite.
  19. S

    What happens when olivine comes in contact with a SiO2 rich melt?

    im studying for an exam and this question came up anyone know what happens?
  20. S

    How do i determine if a rock is qtz-norm, ol-norm, hy-norm or ne-norm?

    i have a rock that has been chemically anaylzed, all oxides are determined. the question is asking me to determine which is qtz-normative,, olivine-norm, hypersthene-norm or nephtaline-norm. ho do i determine which one it is based on the data i am given. the question also gives norm values for...
  21. S

    Find the distance from the sun to the planet known the orbital period problem

    Homework Statement the problem asks to find the distance from the sun to a planet. the only information the question gives the the orbital period of 27 years and asks for the answer in km. Homework Equations c= (2)(pi)(r) The Attempt at a Solution assuming the planet revolves...
  22. S

    Diameter of a planet, known the angular size and distance

    Homework Statement a planet is 5x10^8 km from its sun, from the planet, the sun has an angular size of 1 degree. what is the diameter of the sun? Homework Equations The Attempt at a Solution ive drawn a diagram with the sun and the planet, with the distance between written in and...
  23. S

    Probability problem, central limit theorm/binomial

    Homework Statement if a student writes a true-false test and guesses each answer, what is the probability that he can get 120 to 140 correct answers if there are 200 questions on the test? Homework Equations central limit theorm and binomial distribution my teacher game me a chart that...
  24. S

    Help with probability problem

    Homework Statement a airline finds that 5% of people who bought a plane ticket do not show up for the flight. if the airline sells 160 tickets for a flight that has 155 seats, what is the probability that a seat will be available for every person holding a reservation and planning to fly...
  25. S

    Normally distributed probability problem

    Homework Statement an exam is normally distributed with a mean of 75 and a variance of 64. students with a mark of 90 or above recieve an A+ a) what percentage of students recieve an A+? b) if 12 students write the exam what is the probability 3 get A+? Homework Equations z-score-...
  26. S

    Determining probability using combinations/permutations (i think)

    Homework Statement a student has an exam, the teacher gives 30 questions and 10 of the 30 will be on the final exam. if the student knows how to solve 25 of the 30, what is: a) the probability he will get perfect b) the probability he will get at least 8 questions right Homework...
  27. S

    Help with determining the transition matrix for a markov chain

    Homework Statement well i have my algebra exam coming up and my teacher told us that there is going to be a markov chain problem. the only problem i have is that i dont know how to get the initial transition matrix, which is crucial in getting full marks. can someone help me in determining how...
  28. S

    Help finding the eigenvalues of this

    Homework Statement alright, so i have a question which asks me to find the eigenvalues of a 3x3 square matrix A. after working on it for a long time, i cant figure it out, i know the process of it and i can do 2x2 matrices easily, i cannot figure this one out though. here is the matrix A; 2 0...
  29. S

    How do i find the basis of subspace U

    Homework Statement In this case find the basis of subspace U 1 2 3 4 5 6 7 8 -6 -8 -10 12 Homework Equations elementary row operations The Attempt at a Solution alright, so i know i have to reduce the matrix and i have done so 1 2 3 4 0 1 2 3 0 0 0 1 now the answer...
  30. S

    How do i determine if U is a subspace of R3

    Homework Statement Determine whether U is a subspace of R3 U= [0 s t|s and t in R] Homework Equations My textbook, which is vague in its explinations, says the following "a set of U vectors is called a subspace of Rn if it satisfies the following properties 1. The zero vector 0 is in...