Recent content by jevillan

so that diagram would have two arrows coming from point B (one going down and one going to the right) and they would both be equal in length. Would the net force be the magnitude and direction of the displacement of those two vectors? (In this case, the magnitude would be 0 right?)

http://imageshack.us/photo/my-images/232/unledn.gif/ not quite sure if that's how I'm supposed to draw the forces ... :S

Homework Statement Each corner of a right angled triangle is occupied by identical point charges "A", "B", and "C" repectively."A" exerts force F on "B". An equal force F is exerted by "C" on "B" (ÐABC=90°). Determine an expression for the net force on "B"? Homework Equations F =...

Homework Statement A 0.75 kg block is held at rest against a spring compressing it 27.0 cm. The spring constant is 735 N/m. The block is released and it begins to move toward a loop across a frictionless surface. How much kinetic energy does the block have when the spring is compressed 13.5...

Homework Statement A mass 100.0 g is dropped from some height above the ground and rebounds to a point where it has 78% of its initial gravitational potential energy. As it hits the ground, it is moving at 1.2 m/s. What is the impulse imparted by the ground on the ball? Homework...

Homework Statement Heisenberg's uncertainty principle states that you cannot simultaneously know the position and momentum of an object. In this video link, a laser is aimed through a slot and projected onto a wall. As the slot gets narrower, the projection also gets narrower. Eventually...

Homework Statement A large football player student (1.0 x 10^2 kg) applies a 6.0 x 10^2 N force to another equally burly student (1.0 x 10^2 kg) sitting on a sled (13.2 kg). If sliding friction and air resistance (drag) is 99.5 N, find the acceleration of the sled. In addition, how much...

This is probably a dumb question but, when calculating E = mct, if mass is in g, then c should be in J/g·°C right? Similarly, if mass is in kg, then c should be in J/kg°C? If i mix any of them up and do m in g and c in j/kg then my answer would be off right? thanks! (this is my first post...