The only force acting on a 2 kg body as it moves along a positive x-axis has an x component Fx = - 6x N , with x in meters. The velocity at x = 3 m is 8 m/s. (a) What is the velocity of the body at x = 4 m? (b) At what positive value of x will the body have a velocity of 5 m/s?

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?

Which of these metals are magnetic?