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In the “pole in the barn” example done in lecture, 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 he think this?
ByAdmin4. Question 4 In the “pole in the barn” example done in lecture, even though Alice’s pole is 10 meters long, and Bob’s barn is 8 meters long, Bob thinks…
Consider two identical clocks in a high-rise building on Earth, one clock at the top of the building and one at the bottom. Which of the following is true?
ByAdmin10. Question 10 Consider two identical clocks in a high-rise building on Earth, one clock at the top of the building and one at the bottom. Which of the following…
Consider Alice’s spaceship with the paintball apparatus that shoots two paintballs toward clocks at opposite ends of her ship, each with speed S relative to the apparatus (similar to the video lecture). Assume that Alice has properly synchronized her clocks, that her spaceship is moving with speed V to the right (in the positive x direction) relative to Bob, that S is greater than V, and that S and V are much less than the speed of light. True or false: In Alice’s frame of reference, the two paintballs will hit the clocks simultaneously (i.e., each clock will read the same time when the paintballs hit).
ByAdmin1. Question 1 Consider Alice’s spaceship with the paintball apparatus that shoots two paintballs toward clocks at opposite ends of her ship, each with speed S relative to the apparatus…
Alice creates a machine that can shoot basketballs in a horizontal direction. Using a radar gun, Bob measures the speed of the basketball coming from the machine when it is stationary and finds that it is 30 km/hour. If Alice then puts the machine on top of a car, which she is driving at 10 km/hour away from Bob, and shoots a basketball behind her and toward Bob, what would be the horizontal speed of the ball as Bob measures it, and which direction is it going? (Neglect any effects of air resistance or other sources of friction.)
ByAdmin12. Question 12 Alice creates a machine that can shoot basketballs in a horizontal direction. Using a radar gun, Bob measures the speed of the basketball coming from the machine…
Which world line represents an object moving to the right along the x axis and slowing down (decelerating)?
ByAdmin10. Question 10 Which world line represents an object moving to the right along the x axis and slowing down (decelerating)? 1 point
“Electromagnetic induction” refers to the phenomenon of:
ByAdmin1. Question 1 “Electromagnetic induction” refers to the phenomenon of: 1 point Using mechanical models to portray how electromagnetism works. How electric current traveling through a wire can induce…