A book is sitting on a table at rest. Which of the following best describes the forces acting on the book?
A.
The forces on the book are unbalanced because the gravity pushing up on the book is not equal to the friction from the table pushing the book to the right.
B.
The forces on the book are unbalanced because the gravity pushing down on the book is not equal to the force of the table pushing up on the book.
C.
The forces on the book are balanced forces because the gravity pushing up on the book is equal to the friction from the table pushing the book to the right.
D.
The forces on the book are balanced because the gravity pulling down on the book is equal to the upward force applied by the table.

In physics the desire of an object to keep doing what it is doing is termed?

1point) a skydiver weighing 130 lb (including equipment) falls vertically downward from an altitude of 14,000 ft and opens the parachute after 20 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.85|v|0.85|v| when the parachute is closed and is of magnitude 17|v|17|v| when the parachute is open, where the velocity vv is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. find the speed of the skydiver when the parachute opens. speed is 150.6121788 ft/s find the skydiver's height when the parachute opens. height is 2338.98591 ft find the limiting velocity vlvl after the parachute opens. (think about whether this should be positive or negative.) vl=vl= 7.647 ft/s

What are similarities and differences between refraction, reflection, diffraction and absorption?