NeedHelp!

A rock of a mass 0.2kg is attatched to a 0.75m long string and swung in a vertical plane. What is the slowest speed that the rock can travel and still maintain a circular path. so, i started with the following equation: Fc= mv2/r but where do i go from th...

A. What is the frequency of a photon with a wavelength of 8.35 multiplied by 10-5 m? (The speed of light in a vacuum is 2.998 multiplied by 108 m/s. Planck's constant is 6.626 multiplied by 10-34 J·s.) B. What is the wavelength of a photon with a frequenc...

multiply each term by 3, and solve for y. 3y + 3(5/3) = 3x + 6 3y = 3x + 6 - 5 3y = 3x + 1 3y/3 = 3x/3 + 1/3 y= x + 1/3

Well, work= force x displacement (as you stated) but if he lifts his pencil 20 cm, then lowers it back down to 20 cm, his displacement= 0 therefore, he did 0 joules of work

Oh, so the Centripetal force= mg how though?

Oh, 'at the top' great, thanks for your help :)

just to clairify, you're suffesting that there is no tension when the rock is at the top of the swing?

A. What is the frequency of a photon with a wavelength of 8.35 multiplied by 10^-5 m? (The speed of light in a vacuum is 2.998 multiplied by 108 m/s. Planck's constant is 6.626 multiplied by 10^-34 J·s.) B. What is the wavelength of a photon with a freque...