1.Question 1On a spacetime diagram with time in years and x in light years, what is the slope of a world line of a faster-than-light object that is moving to the right (positive x direction)?1 pointThe slope is greater than 1 (greater than 45 degrees)The slope is less than 1 (less than 45 degrees)The slope equals 1 (45 degrees)

7.Question 7Consider a spacetime diagram for Alice’s frame of reference (so Alice is positioned at x = 0) where x is in units of light years and t is in units of years. Which of the following spacetime points have a spacelike interval with Alice’s spacetime position? (Mark all that are correct.)1 pointx = 9, t = -9x = 7, t = 8x = 23, t = -21x = 9, t = 4

Bob is moving to the right (positive x direction) in his spaceship at a velocity v, and Alice is observing him. Each has their own lattice of clocks and measuring systems, which can be represented in two spacetime diagrams, one for Bob’s frame of reference and one for Alice’s. True or false: Bob’s world line is the line of same location given by xB = 0, whether it’s drawn on Alice’s spacetime diagram or Bob’s spacetime diagram.

6.Question 6Consider a spacetime diagram for Alice’s frame of reference (so Alice is positioned at x = 0) where x is in units of light years and t is in units of years. At t = 0 Alice plans to have a party. Consider the spacetime points listed below. If Bob was located at the point, and he had a spaceship that could travel at any speed up to the speed of light, would he be able to get to the party in time? (Mark all that are possible for him to get to the party in time.)1 pointx = 23, t = -17x = 3, t = 9x = 0, t = -3x = 17, t = -23

6. What does the slope of a velocity-time graph indicate?

An object is moving with a constant positive velocity along positive x-axis. Which of the following statement is true?Group of answer choicesposition – time graph will be a straight line with positive slopeAll statements in this list are incorrectposition -time graph will be a horizontal straight line with a slope of zeroposition-time graph will be a curve sloping upwardposition-time graph will be a curve sloping downward