Recent content by synchronous

Read a little on it once you mentioned it. The axis of rotation Rz, and is perpendicular to the disk and goes through the attachment point, right?

Homework Statement A uniform circular disk whose radius R is 40.0 cm is suspended as a physical pendulum from a point on its rim. (a) What is its period of oscillation? (b) At what radial distance r < R is there a point of suspension that gives the same period? R = .40 m g = 9.81...

Dumb mistake on my part...thanks for the help...you're right on the money!

Homework Statement An automobile can be considered to be mounted on four identical springs as far as vertical oscillations are concerned. The springs of a certain car are adjusted so that the oscillations have a frequency of 3 Hz. (a) What is the spring constant of each spring if the mass of...

Rock on! Thanks for the assistance. I was thinking of the problem as a particle at the end of a massless rod. Finding the center of mass and using that in my calculations led to a correct answer of 2.75 rad/sec.

Homework Statement The thin uniform rod in the figure below has length 2.5 m and can pivot about a horizontal, frictionless pin through one end. It is released from rest at angle θ = 40° above the horizontal. Use the principle of conservation of energy to determine the angular speed of the rod...

I did the calculations without any rounding and came up with an answer of 18.369 or something like that. I have until 11pm tonight to figure this out. I can't see where I went wrong...

Nitrogen is a diatomic molecule. Thanks for the reminder...all is well.

A man (weighing 915 N) stands on a long railroad flatcar (weighing 2640 N) as it rolls at 16.0 m/s in the positive direction of an x axis, with negligible friction. Then the man runs along the flatcar in the negative x direction at 53.00 m/s relative to the flatcar. What is the resulting...

Submitted that solution online, but feedback stated that I was incorrect. Huh?

Homework Statement Man who weighs 915 N stands on a flatcar that weighs 2640 N as it rolls at 16.0 m/s in positive x direction. No friction. Man runs in negative x direction at 53 m/s relative to the flatcar. What is the resulting increase in speed of flatcar? Homework Equations...

You're right...not sure how my brain froze for that calculation...must have been a typo...thought I double-checked it! Thanks!

Homework Statement Pitcher pitches a .30 kg softball has velocity 14 m/s at an angle of 36 degrees below the horizon just before the bat contacts the ball. What is the magnitude of change in momentum if the ball leaves the bat with a velocity of 23 m/s, vertically downward. Homework...

Homework Statement Compute the rms speed of a nitrogen molecule of 35.0 celcius. Homework Equations V(rms) = sqrt((3RT)/M) The Attempt at a Solution I plugged in 8.31 for R and 308 K for T and 14.0 g/mol for M. I arrived at a solution of 23.4 m/s but this answer came back as...

My "incorrect" answer was actually correct. I switched the rotational period to 10.23 hrs and came up with an answer that the online homework accepted. I certainly wasn't using significant digits...thanks for the reminder! BTW, I just left out the units for G to ease the typing...