Vì sao các bộ đốt nóng của bếp điện , nồi cơm điện ... thường làm từ những hợp kim nikêlin hoặc constantan mà không làm bằng dây đồng hoặc dây nhôm

f=ma newton's second law 7x8=56n

be subject to a force andchange its motion

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.