Khi đặt một hiệu điện thế là 12 V vào 2 đầu vật dẫn thì CDDĐ qua nó là 0,6 A. Nếu CDDĐ qua vật dẫn trên là 1 A thì cần phải đặt một HĐT bao nhiêu vào 2 đầu vật dẫn trên?

v=ir = 3x15 =45 v

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.