Recent content by subopolois

  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

    Frequency of oscillation

    Thats kinda what im asking... if the displacement were greater or smaller of the mass, would it change the frequency of oscillation? And if it does, how?
  3. 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=...
  4. 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)) =...
  5. 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...
  6. S

    Spring constant, find height of projectile

    I did not, how would i do that? I did take gravity into account when i found the height...
  7. 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...
  8. 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...
  9. S

    How far will the box slide?

    ahhh. forgot to square the initial velocity. Thanks for all your help!
  10. S

    How far will the box slide?

    ok so lets say i use energy. I have this equation v(initial)^2 = 2(mu)(g)(delta r) and i rearrange to find r r= v(initial)^2 / 2(mu)(g) I put all my numbers in and i get a different answer, 0.54 meters. what did i do wrong?
  11. S

    How far will the box slide?

    Id say id be able to use kinetic energy to solve it, yay or nay?
  12. 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 =...
  13. 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...
  14. S

    Constant acceleration

    I'm stumped. Is it one of those other constant acceleration equations? Whenever I look at them, it always seems like I'm not looking at the right one because it has more variables than what I'm given in the question
  15. 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...
Top