Một dây dẫn thẳng dài vô hạn có dòng điện I = 15A chạy qua. Hãy xác định vecto cường độ từ trường tại điểm M cách dòng điện một đoạn R = 2cm. Biết dòng điện đặt trong chân không

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy.work depends on the square of the change in potential energy.work is equal to the negative of the change in kinetic energy.work is equal to the square of the change in kinetic energy

Acar of mass 800kg is moving at a speed of 2.2m/s.