Books are identified by an international standard book number (isbn), a 10-digit code x1x2…x10, assigned by the publisher. these 10 digits consist of blocks identifying the language, the publisher, the number assigned to the book by its publishing company, and finally, a 1-digit check digit that is either a digit or the letter x (used to represent 10). this check digit is selected so that ∑10i=1ixi≡0 mod 11 and is used to detect errors in individual digits and transposition of digits. (a) the isbn for a book is 1−69−632945−q where q is the check digit. what is q?

In a wind tunnel the speed changes as the cross sectional area of the tunnel changes. if the speed in a 6' x 6' square test section is 100 mph, what was the speed upstream of the test section where the tunnel measured 20' x 20'? use conservation of mass and assume incompressible flow. conservation of mass requires that as the flow moves through a path or a duct the product of the density, velocity and cross sectional area must remain constant; i. e., that ova-constant. a model is being tested in a wind tunnel at a speed of 100 mph if the flow in the test section is at sea level standard conditions, what is the pressure at the model's stagnation point? (a) the tunnel speed is being measured by a pitot-static tube connected to a u- tube manometer. what is the reading on that manometer in inches of water? (b) at one point on the model a pressure of 2058 psf is measured. what is the local airspeed at that point?

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

In science and physics what is the standard unit of measure for speed?