Q1 (5 points) 1- What do we mean by a 'dimension'? 2- What do we mean by a 'unit'? 3- What is the difference between a base unit and a derived unit? 4- What is the difference between a base quantity and a derived quantity? \f30. The volume of Earth is on the order of 10'21 mg. (a) What is this in cubic kilometers (km3)? (b) What is it in cubic miles (mi-1)? (c) What is it in cubic centimeters (cm3)? 40. The average distance between Earth and the Sun is [.5 x l0I ' In. (a) Calculate the average speed of Earth in its orbit (assumed to be circular) in meters per second. (b) What is this biwhat is this speed in miles per hour? QUESTION 40 80. Consider the equation y = mt +b, where the dimension of yis length and the dimension of t is time, and m and b are constants. What are the dimensions and SI units ofta) m and (b) b? 2. Which of the following is a vector: a person's height. the altitude on Mt. Everest, the velocity of a y, the age of Earth, the boiling point of water. the cost of a book, Earth's population, or the acceleration of gravity