A particle including a spring is moving in the horizontal ring without friction. The radius (R) of the ring is 0.75 m. If the speed of the particle considers to be zero at point A and 2 m/s at point B, calculate the unstretched length of the spring. (the mass of particle=3 kg, the constant of spring=21 N/m).

When an object moves in uniform circular motion, the direction of its acceleration is a) in the same direction as its velocity vector. b) in the opposite direction of its velocity vector c) is directed toward the center of its circular path. d) is directed away from the center of its circular path. e) depends on the speed of the object.

When does your body conduct current more readily?

Examine the equation. 23490th→23088ra+42he what kind of barrier would you need to block the radioactive particles from this reaction? a. a piece of paper b. a sheet of aluminum foil c. a two-inch block of lead d. a solid concrete block