Recent content by KL90

c) x = 330t [SIZE="4"]- 1/2 (2.1 x 105) t2 since it is decelerating, the acceleration would be negative. d) 109 Rbatoms/sec x 61545 photons/Rb atom = xphotons/sec Thanks a lot!

Homework Statement A rubidium atom traveling at the speed of sound absorbs photons from an oncoming laser beam Each photon can be viewed as a tiny ping pong ball having momentum 7.79 x 10-28 Nt/sec. The atom absorbs a photon which is then reradiated in any direction. Hence, on average each...

Homework Statement a. Draw a free body diagram for mass Mb while in motion (fig. 2a). Identify the centripetal force. assume that the mass hangs vertically b. Calculate the magnitude of the force exerted by the spring on mass Mb = 402g, moving in a circle of radius r=18cm (fig. 2a). The...

Homework Statement A bullet is shot with a speed v[SIZE="1"]0 at an angle θ above the horizontal. a) what is its maximum height? b) how long does it take before it hits the earth? c) where does it strike the earth? Homework Equations The Attempt at a Solution x component: x=...

Is there any other way to compute without the use of graphing? Could you explain further on why you use sin(a-b)?

Homework Statement An airplane wishes to fly from A to B which is located 1000 km northeast of A. The maximum speed of the plane in still air is 650 km/hr. There is a wind blowing West of 40 km/hr In what direction should the pilot steer the plane to complete the trip as fast as possible...

Could you help explain how to find the velocity and the acceleration for the above equation. I know you differentiate it once for the velocity and then differentiate the velocity for the acceleration, but I'm having trouble.