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 a length contraction effect for the barn, making it even shorter than its rest length of 8 meters.Bob's crazy.Alice observes her pole to increase in length as she travels toward the barn.

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

(1 point) A street light is at the top of a 20 foot tall pole. A 6 foot tall woman walks away from the pole with a speed of 7 ft/sec along a straight path. At what rate is the distance from the base of pole to the tip of the shadow changing when she is 50 ft from the base of the pole?The tip of the shadow is moving at ft/sec.

A woman wants to measure the height of a nearby building. She places a 9ft pole in the shadow of the building so that the shadow of the pole is exactly covered by the shadow of the building. The total length of the building's shadow is 199ft, and the pole casts a shadow that is 5.5ft long. How tall is the building? Round your answer to the nearest foot.