Một chất điểm có khối lượng 200g được ném lên từ điểm O trên mặt đất với vận tốc 15m/s theo phương hợp với phương ngang góc 30 độ. Mômen động lượng của chất điểm đối với điểm O sau 1s kể từ khi ném có giá trị? (Bỏ qua sức cản không khí)

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

prndulum needs thread, weight clock to time swings