R2B.8 A firecracker explodes 30 km away from an observer sitting next to a certain clock A. The light from the firecracker explosion reaches the observer at exactly t = 0 according to clock A. Suppose the firecracker's flash illuminates the face of another clock B that is sitting next to the firecracker. What time will clock B register at the moment of illumination if it is correctly synchronized with clock A? Please draw a model and answer in milliseconds.

Two spaceships can travel in any direction. Each ship carries equipment to measure the speed of light coming from any targeted star. In one experiment, each ship travels at a constant speed and they measure the speed of light from the same star. Which of the following statements is correct? a. If the spaceships travel in a direction perpendicular to the direction of the incoming light, they both measure a light speed of zero. b. No matter in what direction each spaceship travels, they measure a light speed of c. c. For each ship to measure a light speed of c, both ships must travel in the same direction but they can have unequal speeds. d. If the spaceships travel parallel to the incoming light, but in opposite directions, the ship travelling towards the star measures a greater speed of light.

A spacecraft is moving at a speed of 0.530 c relative to the earth. Part A What is the ratio of the length of the spacecraft, as viewed through a telescope on earth, to its length when measured after landing on earth? (Assume that the spacecraft is moving at a right angle to the line of observation.) ? Submit Request Answer

A star is 16.6 light-years from Earth. Part A How long would it take a spacecraft traveling 0.950c to reach that star as measured by observer on Earth? tEarth = 53.25 Submit Previous Answers Request Answer Part B X Incorrect; Try Again; 4 attempts remaining t = 175| ΑΣΦ Submit Part C How long would it take a spacecraft traveling 0.950c to reach that star as measured by observer on the spacecraft? 1 = 15. ΑΣΦ Submit 5 Request Answer [ΠΙ ΑΣΦ www F Request Answer 2 ? What is the distance traveled according to observers on the spacecraft? ? years ? years light-years

Shannon observes two light pulses to be emitted from the same location, but separated in time by 1.5μs. Kimmie observes the emission of the same two pulses to be separated in time by 2.5μs. a. How fast is Kimmie moving relative to Shannon? b. According to Kimmie. what is the separation in space of the two pulses?

In the earth's rest frame, two protons are moving away from each other at equal speed. In the frame of each proton, the other proton has a speed of 0.650c. Part A What does an observer in the rest frame of the earth measure for the speed of each proton? Express your answer as a multiple of the speed of light. V7 ΑΣΦ U = Submit Request Answer ?

Modern physics

Part A The distance to a particular star, as measured in he earth's trame of reference, is 734 ly (1 light year is the distance light travels in 1 y). A spaceship leaves earth headed for the star, and takes 3.66 y to arrive, as measured by passengers on the ship How long does the trip take, according to observers on oarth? Express your answer in years. y Submit Request Answer Part B What distance for the trip do passengers on the spacecraft measure? (Hint What is the speed of light in units of ly/y) Express your answer in light years. ly Submit Beavest Anewer

A star is 16.6 light-years from Earth. Part A How long would it take a spacecraft traveling 0.950c to reach that star as measured by observer on Earth? tEarth 17.5 years Submit ✓ Correct Correct answer is shown. Your answer 17.47 years was either rounded differently or used a different number of significant figures than required for this part. Part B How long would it take a spacecraft traveling 0.950c to reach that star as measured by observer on the spacecraft? t = 5.46 years Submit Part C Previous Answers Correct What is the distance traveled according to observers on the spacecraft? 15.18 light-years Previous Answers Submit Previous Answers Part D V = Correct What will the spacecraft occupants compute their speed to be from the results of part B and part C? 3.29 IVE ΑΣΦ Submit Previous Answers Request Answer ? X Incorrect; Try Again; 4 attempts remaining •C

The space and time coordinates for two events as measured in a frame S are as follows: Event 1: x1=x0 , t1=x0/c Event 2: x2=2x0, t2=x0/2c a. There exists a frame in which these events occur at the same time. Find the velocity of this frame with respect to S. b. What is the value of t at which both events occur in the new frame?