Một con lắc lò xo có khối lượng vật nặng treo vào là 100g và lò xo có độ cứng 200N/m. Kéo quả cầu lệch khỏi VTCB 10cm rồi buông nhẹ cho dao động. Động năng của quả cầu khi có thế năng bằng 3 lần động năng là:

Shelly experiences a backward jolt when the driver starts the school bus. which of the following explains this phenomenon? a. the inertia of shelly b. the inertia of the bus c. the normal force of the seats on shelly d. the net force acting on shelly in a backward direction e. a zero net force acting on shelly

Ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students? each student bumps the shoulder of his or her neighbor. at the exact time, all students take a step to the right. the students skip clockwise, going in a circular motion. one at a time, each student lifts his or her hands up and then down.

Many machines- including inclined planes such as ramps- increase the strength of the force put into the machine but decrease the distance over which the force is applied.