Người ta thực hiện công 200j để nén khí trong 1 xi lanh. Tính độ biến thiên nội năng của khí , biết khi truyền ra môi trường xung quanh nhiệt lượng là 40j

What is the speed of an object at a given moment?

Asynthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5 psi and standard deviation 3.5 psi. how is the standard deviation of the sample mean changed when the sample size is increased from n equals 8 to n equals 47

Aball of mass 0.3kg is released from rest at a height of 8m. how fast is it going when it hits the ground? accleration due to gravity is g=9.8m/s