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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.)
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12. 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…
What was mentioned in one of the lecture videos as a surprising source for gaining insight into how the British and French had different styles of doing physics in the late 1800s?
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5. Question 5 What was mentioned in one of the lecture videos as a surprising source for gaining insight into how the British and French had different styles of doing…
Given that muons travel at 0.998 times the speed of light when they are created in the upper atmosphere by cosmic rays, why is it surprising that they reach the surface of the Earth?
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6. Question 6 Given that muons travel at 0.998 times the speed of light when they are created in the upper atmosphere by cosmic rays, why is it surprising that…
Bob is moving to the right (positive x direction) in his spaceship at a velocity v (such that the value of the Lorentz factor is 2), and Alice is observing him. Each has their own lattice of clocks and measuring systems, which can be represented in two spacetime diagrams on the same plot, one for Bob’s frame of reference and one for Alice’s. Assume that the axes on Alice’s plot are at right angles to each other (horizontal and vertical) and Bob’s are at different but appropriate angles. If Alice observes a set of three flash bulbs at positions xA = 9, 13, and 24, and they all flash at tA = 7.3, which flash would occur first in Bob’s frame of reference?
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5. Question 5 Bob is moving to the right (positive x direction) in his spaceship at a velocity v (such that the value of the Lorentz factor is 2), and…
If Alice travels to the center of the galaxy at a speed very close to the speed of light, what would she see with her eyes (assuming she looked out in her direction of travel)?
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5. Question 5 If Alice travels to the center of the galaxy at a speed very close to the speed of light, what would she see with her eyes (assuming…
What was Einstein’s second postulate (the principle of relativity being the first)?
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3. Question 3 What was Einstein’s second postulate (the principle of relativity being the first)? 1 point The principle of the luminiferous ether The principle of Galileo The principle…
