Assume biological substances are 90 percent water and the density of water is 1.0 ✕ 103 kg/m3.

(a) estimate the mass of a spherical cell with a diameter of 2.50 µm (volume = 4/3 π r3)

(b) estimate the mass of a fly, which can be approximated by a cylinder 3.40 mm long by 1.70 mm in diameter (volume = l π r2)

answers should be in kg

Two vectors are shown. which statement best compares the vectors? vector x has greater magnitude than vector y. vector y has greater magnitude than vector x. the vectors have the same displacement. the vectors have the same direction.

You are given two vectors a⃗ =−3.00ι^ 5.00j^ and b⃗ =5.00ι^ 2.00j^. let the counterclockwise angles be positive.

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?