Một electron điện tích e, khối lượng m chuyển động đều trên một quỹ đạo tròn bán kính r quanh hạt nhân nguyên tử Hidro. Xác định vận tốc chuyển động của electron trên quỹ đạo. Cho e  1,61019 C, m  9,11028 g , khoảng cách trung bình từ electron đến hạt nhân là r  108 cm.

Aforce of 240.0 n causes an object to accelerate at 3.2 m/s2. what is the mass of the object?

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can’t balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.