Recent content by JSmithDawg

Homework Statement A 0.13-m string, fixed at both ends and vibrating in its n = 4 harmonic, excites a pipe that is 0.88 m long and open at both ends, into its second overtone resonance. What is the speed of transverse waves on the string? The speed of sound in air is 345 m/s. Homework...

Homework Statement The 1.8kg , 5.2-cm-diameter disk is rotating as shown. What is the angular momentum of the disk about the axle? Homework Equations L=Iω=(mr^2)ω The Attempt at a Solution r=.026m m=1.8 kg ω=600rpm*(1minute/60seconds)*(2pi radians/1rotation) = 62.83 rad/sec L=(1.8kg *...

Homework Statement You're carrying a 4.0-m-long, 24kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 cm from its tip. I've drawn a diagram of the problem on Paint... Homework Equations ∑τ=0...

Homework Statement The illustration is not drawn to scale. M2 = 4 kg and M1=20kg. They're both on a frictionless surface. A 36N constant force is applied to M2. What's the force exerted by m1 on m2? Homework Equations F=maThe Attempt at a Solution According to Newton's 3rd law, forces come in...

The total mass being accelerated for case one is 10kg+m, and for case two it's m. But isn't the 'm' insignificant when looking at how much force is applied to each system? Wait, but it might be significant when determining acceleration. F=ma, so 98N=11kg(a) vs. 98N = 1kg(a). That makes sense...

Homework Statement In which situation does block m experience a larger acceleration? In case 1, the 10kg mass is hanging from a rope and falling. In case 2, a hand is providing a constant downward force. Assume the rope is massless. Homework Equations F=ma The Attempt at a Solution The force...

Homework Statement The bullet strikes a block of wood which exerts, on average, a force of 50,000N opposing the motion of the bullet. How far does the bullet penetrate? Mass of bullet = 25g Initial velocity of bullet = 350 m/s Final velocity of bullet = 0 m/s Homework Equations Ei+work=Ef K...

Homework Statement The cylindrical space station, d = 280m in diameter, rotates in order to provide artificial gravity of g for the occupants. How much time does the station take to complete one rotation? Homework Equations velocity= (2*pi*r)/period acceleration = v^2/r The Attempt at a...

Homework Statement "Normally, jet engines push air out the back of the engine, resulting in forward thrust, but commercial aircraft often have thrust reversers that can change the direction of the ejected air, sending it forward." "When might thrust reversers be useful in practice? (Chose all...