4.Question 4In the "pole in the barn" example done in the video, even though Alice's pole is 10 meters long, and Bob's barn is 8 meters long, Bob thinks that Alice's pole will fit completely inside as she goes through the barn. Why does Alice think Bob is wrong?1 pointAlice observes her pole to increase in length as she travels toward the barn.Alice observes a length contraction effect for the barn, making it even shorter than its rest length of 8 meters.Bob's crazy

8.Question 8In the "pole in the barn" example done in lecture, how can Bob observe/photograph the front of the pole to be located at the rear door of the barn at 44.4 nanoseconds and the rear of the pole to be located at the front door of the barn at 44.4 nanoseconds (so the entire pole is in the barn), while Alice agrees with Bob's clock readings but never herself observes the pole to be entirely within the barn?1 pointBecause Alice observes Bob's clocks to be unsynchronized, with the rear door photo occurring first and the front door later.Because when Bob synchronized his clocks he forgot to take into account that light travels at a finite speed.Because Bob's crazy.

0:12:56Question 19Not yet answeredMarked out of 1.00Flag questionTipsWhen walking on a tightrope, circus performers often carry a very long horizontal pole with weights dangling down off each end of the pole. The effect of carrying this type of pole is to:Question 19Answera.make the task easier for the performer by decreasing their moment of inertia about the rope and lowering their centre of gravityb.make the task more difficult for the performer by decreasing their moment of inertia about the rope and raising their centre of gravityc.none of the optionsd.make the task easier for the performer by increasing their moment of inertia about the rope and lowering their centre of gravitye.make the task more difficult for the performer by increasing their moment of inertia about the rope and raising their centre of gravity

2.Question 2The effect of length contraction of a moving object arises from (check all that are correct):1 pointThe compression effect of moving through the etherThe lack of synchronization of a set of uniformly moving clocks, which are otherwise synchronized in their rest frame of reference"Leading clocks lag"The relativity of simultaneity

10.Question 10In the twin paradox example done in lecture, how does Alice explain the fact that when she returns, Bob has aged more than she has, even though on both legs of her trip when she was traveling at 0.6c she observed his clocks to run more slowly than hers?1 pointDue to the finite speed of light, there is a delay in when Alice sees the reading on one of Bob's clocks, which means that Alice's observation of Bob's clocks running slow is incorrect.When she turned around at the star, she changed her frame of reference, which led to his clocks jumping ahead of hers (from her perspective).Though it seemed to Alice as if Bob's clocks were running slower than hers, they were actually running faster throughout the whole trip.

11.Question 11Alice is observing the arrivals and departures at a spaceport. She observes one flight land at pad D7, and then notes another flight take off from pad G23 seventeen seconds later. Alice knows that the distance between pad D7 and pad G23 is 1240 meters in her frame of reference. Meanwhile, Bob flies by the spaceport at a high speed V and observes the same landing and takeoff, though he records a different time and distance between the two events, based on his frame of reference. If both Alice and Bob plug in their values for the elapsed time and distance between the landing and takeoff into the formulas below (where c is the speed of light, t is the elapsed time, and x is the distance), which one will give the same answer for both?1 pointc2t2 - x2ct - x2ct + x2c2t2 + x2