Recent content by ctwokay

Homework Statement A gymnast with mass m1 = 48 kg is on a balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 119 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left end of the beam. Now the...

Homework Statement A purple beam is hinged to a wall to hold up a blue sign. The beam has a mass of mb = 6.7 kg and the sign has a mass of ms = 16.8 kg. The length of the beam is L = 2.43 m. The sign is attached at the very end of the beam, but the horizontal wire holding up the beam is...

Homework Statement A spherical bowling ball with mass m = 3.2 kg and radius R = 0.112 m is thrown down the lane with an initial speed of v = 8.1 m/s. The coefficient of kinetic friction between the sliding ball and the ground is μ = 0.32. Once the ball begins to roll without slipping it...

thank you very much

Homework Statement A uniform disk with mass m = 9.32 kg and radius R = 1.37 m lies in the x-y plane and centered at the origin. Three forces act in the +y-direction on the disk: 1) a force 340 N at the edge of the disk on the +x-axis, 2) a force 340 N at the edge of the disk on the –y-axis...

Homework Statement A racquet ball with mass m = 0.223 kg is moving toward the wall at v = 16.3 m/s and at an angle of θ = 35° with respect to the horizontal. The ball makes a perfectly elastic collision with the solid, frictionless wall and rebounds at the same angle with respect to the...

linear speed is v=ωr

either 1 or -1?

Erm is it ω=2∏/T=2∏f? I'm sorry i am very bad at this.

ok i converted the θ to rad, the equation i put 8.6*2*pi*√(9.81/2.42)*sin(√(9.81/2.42)t) so sinωt is the max which is at the period of oscillation? i have the period but it is release at t=0 i can't use t=0 as it is a reference when it is release, so t i have to use some other equation?

is there a phase angle? i put 8.6* √(9.81/2.42)*sin(√(9.81/2.42)) is that right or i have to include t also?

ya its θ˙ first derivative i can't find the symbol but the problem is how do i find ω inside of sin? as ω outside of sin is angular velocity which is dθ/dt

using PE and KE? i can't use that expression? as the prof said need to use that to find

Homework Statement A simple pendulum with mass m = 1.7 kg and length L = 2.42 m hangs from the ceiling. It is pulled back to an small angle of θ = 8.6° from the vertical and released at t = 0. Qn: What is the maximum speed of the pendulum? Homework Equations θ=θmax*cos(ωt+∅) The...

They are asking for average speed