1.

A series of four measurements of the mass, length, and diameter of a cylinder are made by a student. The results of these measurements are: Mass, M (g) Length, L (cm) Diameter, D (cm) Density, p (g/cm3) 21.8 2.71 1.15 20.9 2.68 1.12 21.2 2.78 1.18 20.3 2.70 1.22 What are (a) the standard deviation of the density, and (b) the standard error of the density? Please express your answer in three significant figures.An airplane traveling at a constant horizontal velocity and flying at a certain altitude drops a package right above point A on the ground. The package hits point B on the ground. How are points A and B related? O Point B is at the same location as point A O Point B is in front of point A (i.e., farther down in the direction where the airplane is going) O Point B is behind point A (i.e., farther up the direction where the airplane came from) O The relationship of the two points cannot be determined without knowing the speed of the airplane.A football is kicked from the ground level at an angle of 60" and with an initial velocity of 46 m/s. How high (in meters) does the ball reach in t = 1.28 s? Please round your answer to one decimal place