Cho một con lắc đơn đang DĐĐH với chu kỳ T  2,5s , tại nơi có gia tốc trọng trường g  10   2 (m / s2 ) .
a.) Tính chiều dài của con lắc?
b) Để khi chiều dài con lắc tăng gấp đôi, tính tần số dao động của con lắc?

High schoolphysics 5+3 pts a neon light consists of a glass tube with metal wires at each end. when connected to a high-voltage source, the gas glows. if a fly lands on the glass tube, what will most likely happen? a) the fly will not feel a shock because the glass conducts any free electrons back into the gas. b) electrons will flow directly from the metal wires along the glass and shock the fly. c) the fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal. d) electrons that are moving through the gas will be conducted through the glass and shock the fly.

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.