According to newton’s first law of motion which statement is correct a: the object is always accelerating
b: the object is always at rest
c: the object is always affected by balance forces
d: none of the statements is correct

15. give an example for some particles or waves that are moving faster than light in everyday life 16. what is a laser? 17. what is an oscilloscope? 18. what does it means practically that nothing is faster than light in vacuum? 19. what is vacuum?

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt