Friday
December 6, 2013

# Posts by Charlie

Total # Posts: 355

Physics, relativity
Thanks Drwls, but that's the press release I spotted the error in. I think!

Physics, relativity
I read this in a write-up of an experiment using atomic clocks: To reveal these effects, required the use of highly accurate atomic clocks, calibrated to check that they are perfectly in sync with each other – ticking down the nanoseconds (that's one billionth of a se...

college chemistry
whats is the boiling point of a solution composed of 17.6g of urea in (NH2)2CO in .300 kg of water

college chemistry
whats is the boiling point of a solution composed of 17.6g of urea in (NH2)2CO in .300 kg of water

physics
the passenger's weight is ALWAYS mass x acceleration. Can you work out the acceleration at all 3 stages? The mass of the person is the same for all 3.

Suppose you surveyed 50 students and 34 said that they approve of how the president is doing. Construct 90%, 95%, and 99% confidence intervals for the true proportion of students in your school who approve of how the president is doing. Be sure to specifically calculate the ma...

college physics
A box on a frictionless horizontal surface is pulled by a tension of 42.4N directed at 45 degrees above the horizontal. what is the work done on the box as it moves 2.50 meters along the surface?

college physics
A box on a frictionless surface is pulled back a distance x into a spring with spring constant k and released. What is the formula for the kinetic energy of the box after it leaves the spring?

College Physics
A 50 kg skater moving at 5 m/s over frictionless ice grabs a rope stretched out 10m from a post and perpendicular to her path. She then moves in circles, spiraling inward as the rope wraps around the post. How fast is she moving when she is 2 meters from the post?