Recent content by x3lifelove

The fundamental frequency of a spring that is 25 cm long is 441 Hz. In order to produce a fundamental frequency, using the same spring of 525 Hz, the string must be shortened to what length? I'm honestly not even sure how to start this question. Please help :(

A roller coaster trolley and its passengers have a mass 840 Kg. The trolly comes over the top of the first hill with a speed of .200 m/s. The hill is 85.0 m above the ground. The trolley goes down the first hill and up the crest of the second hill 64.0 m above ground. Ignore the effects of...

The rocket energy would be converted back to potential energy before falling to earth. Since its a system without any external forces its isolated. So that would be the Ek=Ep ? So then the answer to B) would be 4.08 x 10^4J ? Then for C would be 1.39 x 10^3m .

A model rocket has a mass of 3.00kg. It is fired so that when it is 220 m above the ground it is traveling vertically at 165m/s. At the point its fuel runs out so that the rest of the flight is without power. Assume that the effect of air friction is negligible and that all potential energies...

I used the formula. W=(Force)(displacement) 12500J= cos(x)(640N)(24.0m) x= 35.5 degrees

I used cos=(24.0m)/(640N) =87.9 degrees I feel as though i should be taking into account the work that done, but I'm not exactly sure how to.

Will do! Thank you again !

A force of 640 N does 12 500 J of work over a displacement of 24.0m. What is the angle between the displacement and force? I get a answer of 87.9 degrees.

Thank you (:

A force acts an angle of 30.0 degrees relatives to the directions of displacement. What force is required to do 9600 J of work over a displacement of 25.0 m? The solution that i am getting is 443 N of Force, but I'm not sure if i am doing it right though.