Recent content by subopolois

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 there's really no calculation. I thinking its longitudinal because...

Thats kinda what I am asking... if the displacement were greater or smaller of the mass, would it change the frequency of oscillation? And if it does, how?

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=...

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)) =...

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...

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

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 find...

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...

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

ok so let's 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?

Id say id be able to use kinetic energy to solve it, yay or nay?

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 =...

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...

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

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...