Hai quả cầu nhỏ mang điện tích q1 ; 42 đặt cách nhau 3 cm trong không khí thì lực hút tĩnh điện giữa chúng có độ lớn là 2.10 − 2 N. Điện tích tổng cộng của hai quả cầu là –10-8 C . Xác định điện tích q1; q2 của mỗi quả cầu ? Biết rằng |4, > 4,.

Alivestock company reports that the mean weight of a group of young steers is 1100 pounds with a standard deviation of 93 pounds. based on the model n(1100,93) for the weights of steers, what percent of steers weigh a) over 1050 pounds? b) under 1300 pounds? c) between 1150 and 1250 pounds?

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?

Your friend increases her force on the desk by 30n . she doesn't change the direction of her push . what happens to the net force on the desk .will the desk accelerate